Texas Instruments | PCA9306-Q1 Dual Bidirectional I2C Bus and SMBus Voltage-Level Translator (Rev. B) | Datasheet | Texas Instruments PCA9306-Q1 Dual Bidirectional I2C Bus and SMBus Voltage-Level Translator (Rev. B) Datasheet

Texas Instruments PCA9306-Q1 Dual Bidirectional I2C Bus and SMBus Voltage-Level Translator (Rev. B) Datasheet
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PCA9306-Q1
SCPS178B – JULY 2007 – REVISED APRIL 2016
PCA9306-Q1 Dual Bidirectional I2C Bus and SMBus
Voltage-Level Translator
1 Features
•
•
•
•
1
•
•
•
•
•
•
•
•
•
•
•
Qualified for Automotive Applications
AEC-Q100 Qualified With the Following Results:
– Device Temperature Grade 2: –40°C to 105°C
– Device HBM ESD Classification Level H2
– Device CDM ESD Classification Level C4B
2-Bit Bidirectional Translator for SDA and SCL
Lines in Mixed-Mode I2C Applications
Compatible With I2C and SMBus
Less Than 1.5-ns Maximum Propagation Delay to
Accommodate Standard-Mode and Fast-Mode I2C
Devices and Multiple Masters
Allows Voltage-Level Translation Between
– 1.2-V VREF1 and 1.8-V, 2.5-V, 3.3-V, or 5-V
VREF2
– 1.8-V VREF1 and 2.5-V, 3.3-V, or 5-V VREF2
– 2.5-V VREF1 and 3.3-V, or 5-V VREF2
– 3.3-V VREF1 and 5-V VREF2
Provides Bidirectional Voltage Translation With No
Direction Pin
Low 3.5-Ω ON-State Connection Between Input
and Output Ports Provides Less Signal Distortion
Open-Drain I2C I/O Ports (SCL1, SDA1, SCL2,
and SDA2)
5-V Tolerant I2C I/O Ports to Support Mixed-Mode
Signal Operation
High-Impedance SCL1, SDA1, SCL2, and SDA2
Pins for EN = Low
Lock-Up-Free Operation for Isolation When
EN = Low
Flow-Through Pinout for Ease of Printed-Circuit
Board Trace Routing
Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 200-V Machine Model (A115-A)
– 1000-V Charged-Device Model (C101)
2 Applications
•
•
•
•
I2C, SMBus, PMBus, MDIO, UART, Low-Speed
SDIO, GPIO, and Other Two-Signal Interfaces
Automotive Head Units
Automotive Instrument Clusters
Automotive Driver Assistance Cameras
3 Description
This dual bidirectional I2C and SMBus voltage-level
translator, with an enable (EN) input, is operational
from 1.2-V to 3.3-V VREF1 and 1.8-V to 5.5-V VREF2.
The PCA9306-Q1 allows bidirectional voltage
translations between 1.2 V and 5 V, without the use
of a direction pin. The low ON-state resistance (ron) of
the switch allows connections to be made with
minimal propagation delay. When EN is high, the
translator switch is ON, and the SCL1 and SDA1 I/O
are connected to the SCL2 and SDA2 I/O,
respectively, allowing bidirectional data flow between
ports. When EN is low, the translator switch is off,
and a high-impedance state exists between ports.
Device Information(1)
PART NUMBER
PCA9306-Q1
PACKAGE
VSSOP (8)
BODY SIZE (NOM)
2.30 mm × 2.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Application Diagram
PCA9306-Q1
Copyright © 2016 Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
PCA9306-Q1
SCPS178B – JULY 2007 – REVISED APRIL 2016
www.ti.com
Table of Contents
1
2
3
4
5
6
7
Features ..................................................................
Applications ...........................................................
Description .............................................................
Revision History.....................................................
Description (continued).........................................
Pin Configuration and Functions .........................
Specifications.........................................................
1
1
1
2
3
4
5
7.1
7.2
7.3
7.4
7.5
7.6
5
5
5
5
6
11 Power Supply Recommendations ..................... 15
12 Layout................................................................... 15
6
13 Device and Documentation Support ................. 16
Absolute Maximum Ratings ......................................
ESD Ratings..............................................................
Recommended Operating Conditions.......................
Thermal Information ..................................................
Electrical Characteristics ..........................................
Switching Characteristics: Translating Down, VIH =
3.3 V...........................................................................
7.7 Switching Characteristics: Translating Down, VIH =
2.5 V...........................................................................
7.8 Switching Characteristics: Translating Up, VIH = 2.3
V.................................................................................
7.9 Switching Characteristics: Translating Up, VIH = 1.5
V.................................................................................
7.10 Typical Characteristics ............................................
6
7
7
7
8
9
Parameter Measurement Information .................. 8
Detailed Description .............................................. 9
9.1
9.2
9.3
9.4
Overview ................................................................... 9
Functional Block Diagram ......................................... 9
Feature Description................................................. 10
Device Functional Modes........................................ 10
10 Application and Implementation........................ 11
10.1 Application Information.......................................... 11
10.2 Typical Application ................................................ 11
12.1 Layout Guidelines ................................................. 15
12.2 Layout Example .................................................... 15
13.1
13.2
13.3
13.4
13.5
Documentation Support ........................................
Community Resource............................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
16
16
16
16
16
14 Mechanical, Packaging, and Orderable
Information ........................................................... 16
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision A (March 2013) to Revision B
•
2
Page
Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section ................................................................................................. 1
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5 Description (continued)
In I2C applications, the bus capacitance limit of 400 pF restricts the number of devices and bus length. Using the
PCA9306-Q1 enables the system designer to isolate two halves of a bus; thus, more I2C devices or longer trace
length can be accommodated.
The PCA9306-Q1 also can be used to run two buses, one at 400-kHz operating frequency and the other at
100-kHz operating frequency. If the two buses are operating at different frequencies, the 100-kHz bus must be
isolated when the 400-kHz operation of the other bus is required. If the master is running at 400 kHz, the
maximum system operating frequency may be less than 400 kHz because of the delays added by the repeater.
All channels have the same electrical characteristics, and there is minimal deviation from one output to another in
voltage or propagation delay. This is a benefit over discrete transistor voltage translation solutions, because the
fabrication of the switch is symmetrical. The translator provides excellent ESD protection to lower-voltage devices
and at the same time protects less ESD-resistant devices.
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6 Pin Configuration and Functions
DCU Package
8-Pin VSSOP
Top View
GND
1
8
EN
VREF1
SCL1
2
7
3
6
VREF2
SCL2
SDA1
4
5
SDA2
Pin Functions
PIN
NO.
DESCRIPTION
NAME
1
GND
Ground, 0 V
2
VREF1
Low-voltage-side reference supply voltage for SCL1 and SDA1
3
SCL1
Serial clock, low-voltage side. Connect to VREF1 through a pullup resistor.
4
SDA1
Serial data, low-voltage side. Connect to VREF1 through a pullup resistor.
5
SDA2
Serial data, high-voltage side. Connect to VREF2 through a pullup resistor.
6
SCL2
Serial clock, high-voltage side. Connect to VREF2 through a pullup resistor.
7
VREF2
High-voltage-side reference supply voltage for SCL2 and SDA2
8
EN
4
Switch enable input. Connected to VREF2 and pulled up through a high resistor.
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7 Specifications
7.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted) (1)
MIN
MAX
UNIT
VREF1
DC reference voltage
–0.5
7
V
VREF2
DC reference bias voltage
–0.5
7
V
VI
Input voltage (2)
–0.5
7
V
VI/O
Input/output voltage (2)
–0.5
7
V
128
mA
Continuous channel current
IIK
Input clamp current
θJA
Package thermal impedance
Tstg
Storage temperature
(1)
(2)
VI < 0
–65
–50
mA
227
°C/W
150
°C
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
The input and input/output negative voltage ratings may be exceeded if the input and output current ratings are observed.
7.2 ESD Ratings
VALUE
V(ESD)
(1)
Electrostatic discharge
Human-body model (HBM), per AEC Q100-002 (1)
±2000
Charged-device model (CDM), per AEC Q100-011
±750
UNIT
V
AEC Q100-002 indicates that HBM stressing shall be in accordance with the ANSI/ESDA/JEDEC JS-001 specification.
7.3 Recommended Operating Conditions
MIN
MAX
SCL1, SDA1, SCL2, SDA2
UNIT
VI/O
Input/output voltage
0
5
V
VREF1
Reference voltage
0
5
V
VREF2
Reference voltage
0
5
V
EN
Enable input voltage
0
5
V
IPASS
Pass switch current
64
mA
TA
Operating free-air temperature
–40
105
°C
7.4 Thermal Information
PCA9306-Q1
THERMAL METRIC (1)
DCU (VSSOP)
UNIT
8 PINS
RθJA (2)
(1)
(2)
Junction-to-ambient thermal resistance
227
°C/W
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report, SPRA953.
The package thermal impedance is calculated in accordance with JESD 51-7.
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7.5 Electrical Characteristics
over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER
MIN TYP (1) MAX
TEST CONDITIONS
UNIT
VIK
Input clamp voltage
II = –18 mA,
EN = 0 V
–1.2
V
IIH
Input leakage current
VI = 5 V,
EN = 0 V
5
μA
Ci(EN)
Input capacitance
Cio(off)
Off capacitance
SCLn, SDAn
VO = 3 V or 0 V,
EN = 0 V
Cio(on)
On capacitance
SCLn, SDAn
VO = 3 V or 0 V,
EN = 3 V
VI = 3 V or 0 V
VI = 0 V,
ron
(2)
(1)
(2)
ON-state resistance
11
IO = 64 mA
SCLn, SDAn
VI = 2.4 V,
IO = 15 mA
VI = 1.7 V,
IO = 15 mA
pF
4
6
pF
pF
10.5
12.5
EN = 4.5 V
3.5
5.5
EN = 3 V
4.7
7
EN = 2.3 V
6.3
9.5
EN = 1.5 V
25.5
32
1
6
15
EN = 3 V
20
60
140
EN = 2.3 V
20
60
140
EN = 4.5 V
Ω
All typical values are at TA = 25°C.
Measured by the voltage drop between the SCL1 and SCL2, or SDA1 and SDA2 terminals, at the indicated current through the switch.
ON-state resistance is determined by the lowest voltage of the two terminals.
7.6 Switching Characteristics: Translating Down, VIH = 3.3 V
over recommended operating free-air temperature range, EN = 3.3 V, VIH = 3.3 V, VIL = 0, and VM = 1.15 V (unless otherwise
noted) (see Figure 3)
PARAMETER
tPLH
FROM
(INPUT)
SCL2 or SDA2
tPHL
SCL2 or SDA2
TO
(OUTPUT)
SCL1 or SDA1
SCL1 or SDA1
TEST CONDITIONS
MIN
MAX
CL = 50 pF
0.8
CL = 30 pF
0.6
CL = 15 pF
0.3
CL = 50 pF
1.2
CL = 30 pF
1
CL = 15 pF
0.5
UNIT
ns
ns
7.7 Switching Characteristics: Translating Down, VIH = 2.5 V
over recommended operating free-air temperature range, EN = 2.5 V, VIH = 2.5 V, VIL = 0, and VM = 0.75 V (unless otherwise
noted) (see Figure 3)
PARAMETER
tPLH
tPHL
6
FROM
(INPUT)
SCL2 or SDA2
SCL2 or SDA2
TO
(OUTPUT)
SCL1 or SDA1
SCL1 or SDA1
TEST CONDITIONS
MIN
MAX
CL = 50 pF
1
CL = 30 pF
0.7
CL = 15 pF
0.4
CL = 50 pF
1.3
CL = 30 pF
1
CL = 15 pF
0.6
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UNIT
ns
ns
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7.8 Switching Characteristics: Translating Up, VIH = 2.3 V
over recommended operating free-air temperature range, EN = 3.3 V, VIH = 2.3 V, VIL = 0, VT = 3.3 V, VM = 1.15 V, and
RL = 300 Ω (unless otherwise noted) (see Figure 3)
FROM
(INPUT)
PARAMETER
tPLH
SCL1 or SDA1
tPHL
SCL1 or SDA1
TO
(OUTPUT)
TEST CONDITIONS
SCL2 or SDA2
SCL2 or SDA2
MIN
MAX
CL = 50 pF
0.9
CL = 30 pF
0.6
CL = 15 pF
0.4
CL = 50 pF
1.4
CL = 30 pF
1.1
CL = 15 pF
0.7
UNIT
ns
ns
7.9 Switching Characteristics: Translating Up, VIH = 1.5 V
over recommended operating free-air temperature range, EN = 2.5 V, VIH = 1.5 V, VIL = 0, VT = 2.5 V, VM = 0.75 V, and
RL = 300 Ω (unless otherwise noted) (see Figure 3)
FROM
(INPUT)
PARAMETER
tPLH
TO
(OUTPUT)
SCL1 or SDA1
tPHL
SCL2 or SDA2
SCL1 or SDA1
SCL2 or SDA2
TEST CONDITIONS
MIN
MAX
CL = 50 pF
1
CL = 30 pF
0.6
CL = 15 pF
0.4
CL = 50 pF
1.3
CL = 30 pF
1.3
CL = 15 pF
0.8
UNIT
ns
7.10 Typical Characteristics
100
300
25qC (Room Temp.)
85qC
-40qC
90
250
80
70
RON (:)
RON (:)
200
150
100
60
50
40
30
20
25qC (Room Temp.)
85qC
-40qC
50
10
0
0
0
0.5
VEN = 1.5 V
1
1.5
2
2.5
3
VSDA1 or VSCL1 (V)
3.5
4
4.5
0
0.5
D001
II = 15 mA
VEN = 4.5 V
Figure 1. ON-Resistance (RON) vs Input Voltage (VSDA1 or
VSCL1)
1
1.5
2
2.5
3
VSDA1 or VSCL1 (V)
3.5
4
4.5
D001
II = 15 mA
Figure 2. ON-Resistance (RON) vs Input Voltage (VSDA1 or
VSCL1)
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8 Parameter Measurement Information
VT
RL
USAGE
SWITCH
Translating up
Translating down
S1
S2
S1
Open
From Output
Under Test
S2
3.3 V
Input
VM
VM
VIL
CL
(see Note A)
5V
Output
VM
VM
LOAD CIRCUIT
VOL
TRANSLATING UP
5V
Input
VM
VM
VIL
2V
Output
VM
VM
VOL
TRANSLATING DOWN
NOTES: A. CL includes probe and jig capacitance.
B. All input pulses are supplied by generators having the following characteristics: PRR ≤ 10 MHz, ZO = 50 Ω, tr ≤ 2 ns, tf ≤ 2 ns.
C. The outputs are measured one at a time, with one transition per measurement.
Figure 3. Load Circuit for Outputs
8
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9 Detailed Description
9.1 Overview
The PCA9306-Q1 is a dual bidirectional I2C and SMBus voltage-level translator with an enable (EN) input that
operates without the use of a direction pin. The voltage supply range for VREF1 is 1.2 V to 3.3 V and the supply
range for VREF2 is 1.8 V to 5.5 V.
The PCA9306-Q1 can also be used to run two buses, one at a 400-kHz operating frequency and the other at a
100-kHz operating frequency. If the two buses are operating at different frequencies, the 100-kHz bus must be
isolated by using the EN pin when the 400-kHz operation of the main bus is required. If the master is running at
400 kHz, the maximum system operating frequency may be less than 400 kHz because of the delays added by
the repeater.
In I2C applications, the bus capacitance limit of 400 pF restricts the number of devices and bus length. The
capacitive load on both sides of the PCA9306-Q1 must be considered when approximating the total load of the
system, ensuring the sum of both sides is under 400 pF.
Both the SDA and SCL channels of the PCA9306-Q1 have the same electrical characteristics and there is
minimal deviation from one output to another in voltage or propagation delay. This characteristic is a benefit over
discrete transistor voltage translation solutions, because the fabrication of the switch is symmetrical. The
translator provides excellent ESD protection to lower-voltage devices and at the same time protects less ESDresistant devices.
9.2 Functional Block Diagram
VREF1
VREF2
2
7
8
SCL1
SDA1
3
4
SW
SW
6
5
EN
SCL2
SDA2
1
GND
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Figure 4. Logic Diagram (Positive Logic)
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9.3 Feature Description
9.3.1 Enable (EN) Pin
The PCA9306-Q1 is a double-pole, single-throw switch in which the gate of the transistors is controlled by the
voltage on the EN pin. In Figure 5, the PCA9306-Q1 always remains enabled when power is applied to VREF2.
Figure 5, the device becomes enabled when a control signal from a processor is in a logic high state. In another
variation, the EN pin can be controlled by the output of a processor, but VREF2 can be connected to a power
supply through a 200-kΩ resistor. In this case, VREF2 and EN are not to be tied together and the SCL and SDA
switches are in a high impedance state when EN is in a logic-low state, as shown in the Device Functional
Modes section.
9.3.2 Voltage Translation
The primary feature of the PCA9306-Q1 is translating voltage from an I2C bus referenced to VREF1 up to an I2C
bus referenced to VDPU, to which VREF2 is connected through a 200-kΩ pullup resistor. When translating a
standard, open-drain I2C bus, this is achieved by simply connecting pullup resistors from SCL1 and SDA1 to
VREF1 and connecting pullup resistors from SCL2 and SDA2 to VDPU. Find more information on sizing the
pullup resistors in the Sizing Pullup Resistor section.
9.4 Device Functional Modes
Table 1 describes the two functions of the translation device.
Table 1. Function Table
(1)
10
INPUT
EN (1)
TRANSLATOR FUNCTION
H
SCL1 = SCL2, SDA1 = SDA2
L
Disconnect
EN is controlled by the VREF2 logic levels and must be at least 1 V higher than VREF1 for best translator
operation.
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10 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
10.1 Application Information
10.1.1 General Applications of I2C
As with the standard I2C system, pullup resistors are required to provide the logic-high levels on the translator
bus. The size of these pullup resistors depends on the system, but each side of the repeater must have a pullup
resistor. The device is designed to work with standard-mode and fast-mode I2C devices, in addition to SMBus
devices. Standard-mode I2C devices only specify 3 mA in a generic I2C system where standard-mode devices
and multiple masters are possible. Under certain conditions, high termination currents can be used. When the
SDA1 or SDA2 port is low, the clamp is in the ON state, and a low-resistance connection exists between the
SDA1 and SDA2 ports. Assuming the higher voltage is on the SDA2 port when the SDA2 port is high, the voltage
on the SDA1 port is limited to the voltage set by VREF1. When the SDA1 port is high, the SDA2 port is pulled to
the pullup supply voltage of the drain (VDPU) by the pullup resistors. This functionality allows a seamless
translation between higher and lower voltages selected by the user, without the need for directional control. The
SCL1-SCL2 channel also functions in the same way as the SDA1-SDA2 channel.
10.2 Typical Application
Figure 5 and Figure 6 show how these pullup resistors are connected in a typical application, as well as two
options for connecting the EN pin.
VDPU = 3.3 V
200 kΩ
PCA9306-Q1
VREF1 = 1.8 V
2
RPU
EN 8
RPU
RPU
7
VREF1
VREF2
SCL1
SCL2
RPU
VCC
SCL
3
SW
VCC
6
2
I C Bus
Master
SDA
GND
SCL
2
I C Bus
Device
4
SDA2
SDA1
SW
5
SDA
GND
GND
1
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Figure 5. Typical Application Circuit (Switch Always Enabled) Diagram
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Typical Application (continued)
VDPU = 3.3 V
3.3-V Enable Signal
On
Off
200 k Ω
PCA9306-Q1
EN
VREF1 = 1.8 V
RPU
2
VREF2
VREF1
RPU
8
RPU
7
RPU
VCC
SCL
3
SCL1
VCC
SW
SCL2
6
I2C Bus
Device
I2C Bus
Master
SDA
SCL
4
SDA1
SW
SDA2
5
SDA
GND
GND
GND
1
Copyright © 2016 Texas Instruments Incorporated
Figure 6. Typical Application Circuit (Switch Enable Control) Diagram
10.2.1 Design Requirements
Table 2 lists the design parameters for this example.
Table 2. Design Parameters
MIN TYP (1)
MAX
UNIT
VREF2
Reference voltage
VREF1 + 0.6
2.1
5
V
EN
Enable input voltage
VREF1 + 0.6
2.1
5
V
VREF1
Reference voltage
0
1.5
4.4
IPASS
Pass switch current
IREF
Reference-transistor current
TA
Operating free-air temperature
(1)
14
μA
5
–40
V
mA
85
°C
All typical values are at TA = 25°C.
10.2.2 Detailed Design Procedure
10.2.2.1 Bidirectional Translation
For the bidirectional clamping configuration (higher voltage to lower voltage or lower voltage to higher voltage),
the EN input must be connected to VREF2 and both pins pulled to high-side VDPU through a pullup resistor
(typically 200 kΩ). This allows VREF2 to regulate the EN input. A filter capacitor on VREF2 is recommended. The
I2C bus master output can be totem-pole or open-drain (pullup resistors may be required) and the I2C bus device
output can be totem-pole or open-drain (pullup resistors are required to pull the SCL2 and SDA2 outputs to
VDPU). However, if either output is totem-pole, data must be unidirectional or the outputs must be 3-stateable and
be controlled by some direction-control mechanism to prevent high-to-low contentions in either direction. If both
outputs are open-drain, no direction control is needed.
The reference supply voltage (VREF1) is connected to the processor core power-supply voltage.
12
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10.2.2.2 Sizing Pullup Resistor
The pullup resistor value must limit the current through the pass transistor, when it is in the ON state, to about 15
mA. This ensures a pass voltage of 260 mV to 350 mV. If the current through the pass transistor is higher than
15 mA, the pass voltage also is higher in the ON state. To set the current through each pass transistor at 15 mA,
the pullup resistor value is calculated as:
V
* 0.35 V
R PU + DPU
0.015 A
(1)
Table 3 summarizes resistor values, reference voltages, and currents at 15 mA, 10 mA, and 3 mA. The resistor
value shown in the +10% column (or a larger value) must be used to ensure that the pass voltage of the
transistor is 350 mV or less. The external driver must be able to sink the total current from the resistors on both
sides of the PCA9306-Q1 device at 0.175 V, although the 15 mA applies only to current flowing through the
PCA9306-Q1 device.
Table 3. Pullup Resistor Values
(1) (2)
PULLUP RESISTOR VALUE (Ω)
VDPU
(1)
(2)
(3)
15 mA
10 mA
3 mA
NOMINAL
+10% (3)
NOMINAL
+10% (3)
NOMINAL
+10% (3)
5V
310
341
465
512
1550
1705
3.3 V
197
217
295
325
983
1082
2.5 V
143
158
215
237
717
788
1.8 V
97
106
145
160
483
532
1.5 V
77
85
115
127
383
422
1.2 V
57
63
85
94
283
312
Calculated for VOL = 0.35 V
Assumes output driver VOL = 0.175 V at stated current
+10% to compensate for VDD range and resistor tolerance
10.2.2.3 PCA9306-Q1 Bandwidth
The maximum frequency of the PCA9306-Q1 device depends on the application. The device can operate at
speeds of > 100 MHz given the correct conditions. The maximum frequency is dependent upon the loading of the
application. The PCA9306-Q1 device behaves like a standard switch where the bandwidth of the device is
dictated by the ON-resistance and ON-capacitance of the device.
Figure 9 shows a bandwidth measurement of the PCA9306-Q1 device using a two-port network analyzer.
The 3-dB point of the PCA9306-Q1 device is approximately 600 MHz. However, this is an analog type of
measurement. For digital applications, the signal must not degrade up to the fifth harmonic of the digital signal.
As a rule of thumb, the frequency bandwidth must be at least five times the maximum digital clock rate. This
component of the signal is very important in determining the overall shape of the digital signal. In the case of the
PCA9306-Q1 device, digital clock frequency of > 100 MHz can be achieved.
The PCA9306-Q1 device does not provide any drive capability like the PCA9515 or PCA9517 series of devices.
Therefore, higher-frequency applications require higher drive strength from the host side. No pullup resistor is
needed on the host side (3.3 V) if the PCA9306-Q1 device is being driven by standard CMOS push-pull output
driver. Ideally, it is best to minimize the trace length from the PCA9306-Q1 device on the sink side (1.8 V) to
minimize signal degradation.
You can then use a simple formula to compute the maximum practical frequency component or the knee
frequency (fknee). All fast edges have an infinite spectrum of frequency components. However, there is an
inflection (or knee) in the frequency spectrum of fast edges where frequency components higher than fknee are
insignificant in determining the shape of the signal.
To calculate fknee:
fknee= 0.5 / RT (10–90%)
fknee = 0.4 / RT (20–80%)
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For signals with rise-time characteristics based on 10- to 90-percent thresholds, fknee is equal to 0.5 divided by
the rise time of the signal. For signals with rise-time characteristics based on 20- to 80-percent thresholds, which
is very common in many current device specifications, fknee is equal to 0.4 divided by the rise time of the signal.
Some guidelines to follow that help maximize the performance of the device:
• Keep trace length to a minimum by placing the PCA9306-Q1 device close to the I2C output of the processor.
• The trace length must be less than half the time of flight to reduce ringing and line reflections or nonmonotonic behavior in the switching region.
• To reduce overshoots, a pullup resistor can be added on the 1.8-V side; be aware that a slower fall time is to
be expected.
10.2.3 Application Curves
25
1.8
Standard-mode
Fast-mode
Minimum Pull-Up Resistance (k
1.6
Rp(max) (kOhm)
20
15
10
5
1.4
1.2
1.0
0.8
0.6
0.4
VDPUX > 2 V
0.2
9'38; ”
0.0
0
0
50
100
150
Standard mode
(fSCL = 100 kHz, tr = 1 μs)
200
250
Cb (pF)
300
350
400
0.0
450
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
Pull-Up Reference Voltage (V)
D008
9
5.0
5.5
C005
VOL = 0.2 × VDPUX , IOL = 2 mA when VDPUX ≤ 2 V
VOL = 0.4 V, IOL = 3 mA when VDPUX > 2 V
Fast mode
(fSCL = 400 kHz, tr = 300 ns)
Figure 7. Maximum Pullup Resistance (Rp(max)) vs Bus
Capacitance (Cb)
Figure 8. Minimum Pullup Resistance (Rp(min)) vs Pullup
Reference Voltage (VDPUX)
0
–1
–2
Gain (dB)
–3
–4
–5
–6
–7
–8
–9
0.1
1
10
100
Frequency (MHz)
1000
Figure 9. Bandwidth
14
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11 Power Supply Recommendations
For supplying power to the PCA9306-Q1, the VREF1 pin can be connected directly to a power supply. The
VREF2 pin must be connected to the VDPU power supply through a 200-kΩ resistor. Failure to have a high
impedance resistor between VREF2 and VDPU results in excessive current draw and unreliable device
operation.
12 Layout
12.1 Layout Guidelines
For printed-circuit board (PCB) layout of the PCA9306-Q1, common PCB layout practices must be followed;
however, additional concerns related to high-speed data transfer such as matched impedances and differential
pairs are not a concern for I2C signal speeds.
In all PCB layouts, it is a best practice to avoid right angles in signal traces, to fan out signal traces away from
each other upon leaving the vicinity of an integrated circuit (IC), and to use thicker trace widths to carry higher
amounts of current that commonly pass through power and ground traces. The 100-pF filter capacitor must be
placed as close to VREF2 as possible. A larger decoupling capacitor can also be used, but a longer time constant
of two capacitors and the 200-kΩ resistor results in longer turnon and turnoff times for the PCA9306-Q1 device.
These best practices are shown in Figure 10.
For the layout example provided in Figure 10, it would be possible to fabricate a PCB with only two layers by
using the top layer for signal routing and the bottom layer as a split plane for power (VCC) and ground (GND).
However, a four-layer board is preferable for boards with higher-density signal routing. On a four-layer PCB, it is
common to route signals on the top and bottom layer, dedicate one internal layer to a ground plane, and dedicate
the other internal layer to a power plane. In a board layout using planes or split planes for power and ground,
vias are placed directly next to the surface-mount component pad, which must attach to VCC or GND, and the via
is connected electrically to the internal layer or the other side of the board. Vias are also used when a signal
trace must be routed to the opposite side of the board, but this technique is not demonstrated in Figure 10.
12.2 Layout Example
Figure 10. PCA9306-Q1 Layout Example
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13 Device and Documentation Support
13.1 Documentation Support
13.1.1 Related Documentation
For related documentation, see the following:
Technical Documents – http://www.ti.com/product/PCA9306-Q1/technicaldocuments
13.2 Community Resource
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of
Use.
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help
solve problems with fellow engineers.
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and
contact information for technical support.
13.3 Trademarks
E2E is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
13.4 Electrostatic Discharge Caution
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
13.5 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
14 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
16
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PACKAGE OPTION ADDENDUM
www.ti.com
31-May-2019
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
Lead/Ball Finish
MSL Peak Temp
(2)
(6)
(3)
Op Temp (°C)
Device Marking
(4/5)
PCA9306IDCURQ1
ACTIVE
VSSOP
DCU
8
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 105
CCUS
PCA9306TDCURQ1
ACTIVE
VSSOP
DCU
8
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 105
YAAS
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based
flame retardants must also meet the <=1000ppm threshold requirement.
(3)
MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4)
There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5)
Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
(6)
Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish
value exceeds the maximum column width.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
Addendum-Page 1
Samples
PACKAGE OPTION ADDENDUM
www.ti.com
31-May-2019
OTHER QUALIFIED VERSIONS OF PCA9306-Q1 :
• Catalog: PCA9306
NOTE: Qualified Version Definitions:
• Catalog - TI's standard catalog product
Addendum-Page 2
PACKAGE MATERIALS INFORMATION
www.ti.com
3-Aug-2017
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0
Diameter Width (mm)
(mm) W1 (mm)
B0
(mm)
K0
(mm)
P1
(mm)
W
Pin1
(mm) Quadrant
PCA9306IDCURQ1
VSSOP
DCU
8
3000
180.0
8.4
2.25
3.35
1.05
4.0
8.0
Q3
PCA9306TDCURQ1
VSSOP
DCU
8
3000
180.0
8.4
2.25
3.35
1.05
4.0
8.0
Q3
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
3-Aug-2017
*All dimensions are nominal
Device
Package Type
Package Drawing
Pins
SPQ
Length (mm)
Width (mm)
Height (mm)
PCA9306IDCURQ1
VSSOP
DCU
8
3000
202.0
201.0
28.0
PCA9306TDCURQ1
VSSOP
DCU
8
3000
202.0
201.0
28.0
Pack Materials-Page 2
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