datasheet for ZT3078S by Zywyn
ZT3070S Low Power 3V 250kbps/500kbps/16Mbps RS485 Transceivers with Hot-Swap
Zywyn Corporation
ZT3070S-ZT3078S
Zywyn
ZT307xS
Low Power 3V 250kbps/500kbps/16Mbps RS485 Transceivers
with Hot-Swap
Features
General Description
• Meets or exceeds the requirements of ANSI Standard TIA/EIA-485-A and ISO 8482:1987(E) specifications for VCC at +3.3V ±10%
• Low quiescent current – 1.2mA typ., 1.8mA max.
• Low shutdown current (where applicable) - 0.05μA
typical, 10μA max.
• Guaranteed standard data rate 250kbps, 500kbps,
or 16Mbps
• True Fail-Safe (Open and Short) Receiver
• -7V to +12V common-mode input voltage range
• Half-Duplex or Full-Duplex configuration
• Allows up to 1/8 unit load (256 devices) on the
same common bus
• Controlled driver output slew rate and receiver
input filtering
• Active-high driver enable and active-low receiver
enable
• Hot-Swap circuitry on the DE and RE enable pins
• ESD Protection on bus terminals
±15kV Human Body Model (HBM)
• Drop-in Replacements for MAX1307xE
The ZT3070S series devices are 3V differential data
line transceivers for RS485/RS422 communication that
consist of one driver and one receiver with high level
of ESD protection. They are designed for balanced
transmission lines interface that meet ANSI standard
TIA/EIA-485-A and ISO 8482:1987(E) specifications.
The ZT3070S series devices span out with half or full
duplex, data rate guaranteed at 250kbps, 500kbps or
16Mbps, and allow 1/8 unit load that fan out 256 devices
sharing a common bus. The I/Os are enhanced-electrostatic discharge (ESD) protected, exceeding ±15kV
Human Body Model (HBM).
Applications
•
•
•
•
•
•
•
•
•
•
RS-422/RS-485 communications
Utility meters
Industrial process control
Building automation
Level translators
Transceivers for EMI-sensitive applications
Routers and HUBs
Industrial-controlled Local Area Networks
Industrial PCs, embedded PCs and peripherals
Industrial, security CATV and camera applications
Product Selection Guide And Cross Reference
Sle w
Ra t e
Lim it
Low - Pow e r
Sh u t dow n
Tx / Rx
En a ble
256
Yes
Yes
Yes
0.250
256
Yes
No
No
Half
0.250
256
Yes
Yes
Yes
ZT3073S
Full
0.5
256
Yes
Yes
Yes
ZT3074S
Full
0.5
256
Yes
No
No
ZT3075S
Half
0.5
256
Yes
Yes
Yes
ZT3076S
Full
16
256
No
Yes
Yes
ZT3077S
Full
16
256
No
No
No
ZT3078S
Half
16
256
No
Yes
Yes
Pa r t
N u m be r
D u ple x
ZT3070S
Full
0.250
ZT3071S
Full
ZT3072S
Zywyn
D a t a Ra t e # of Tx /
( M bps)
Rx on Bu s
Pa ck a ge
Type s
Pin - t o- Pin Cr oss
Re fe r e n ce
14- PDI P,
14- nSOI C
8- PDI P, 8nSOI C, 8- MSOP
8- PDI P,
8- nSOI C,
8- MSOP
14- PDI P,
14- nSOI C
8- PDI P,
8- nSOI C,
8- MSOP
8- PDI P,
8- nSOI C,
8- MSOP
14- PDI P,
14- nSOI C
8- PDI P,
8- nSOI C,
8- MSOP
8- PDI P,
8- nSOI C,
8- MSOP
MAX13070E
MAX13071E
MAX13072E
MAX13073E
MAX13074E
MAX13075E
MAX13076E
MAX13077E
MAX13078E
Specifications subject to change without notice
Zywyn Corporation • Tel (408) 733-3225 • Fax (408) 733-3206 1• Email sales@zywyn.com • www.zywyn.com
July 2012
rev. 1.0
Zywyn Corporation
Absolute Maximum Ratings
ZT3070S-ZT3078S
Storage Considerations
These are stress ratings only and functional operation of
the device at these ratings or any other above those indicated in the operation sections of the specifications is not
implied. Exposure to absolute maximum rating conditions
for extended periods of time may affect reliability.
Power Supply, (VCC).................................... –0.3V to +7.0V
Input Voltages
DI, DE, RE ........................................ –0.3V to (VCC +0.3V)
Differential Input Voltage, (VID) ..................... -12V to +12V
A, B (VI) ......................................................... -9V to +13V
Output Voltages
RO ............................................................... –0.3V to +6.0V
Y, Z (A & B on Half Duplex) ...........................-9V to +13.0V
Operating Temperature...............................–40°C to +85°C
Storage Temperature ................................–65°C to +150°C
Power Dissipation Per Package
8-pin PDIP (derate 9.09mW/°C above +70°C) ........ 722mW
8-pin nSOIC (derate 6.14mW/°C above +70°C) ....... 500mW
8-pin MSOP (derate 4.85mW/°C above +70°C)..........400mW
14-pin PDIP (derate 10.00mW/°C above +70°C) ...... 800mW
14-pin nSOIC (derate 8.33mW/°C above +70°C) .... 667mW
Zywyn
Storage in a low humidity environment is preferred. Large
high density plastic packages are moisture sensitive
and should be stored in Dry Vapor Barrier Bags. Prior
to usage, the parts should remain bagged and stored
below 40°C and 60%RH. If the parts are removed from
the bag, they should be used within 168 hours or stored
in an environment at or below 20%RH. If the above conditions cannot be followed, the parts should be baked
for 12 hours at 125°C in order to remove moisture prior
to soldering. Zywyn ships product in Dry Vapor Barrier
Bags with a humidity indicator card and desiccant pack.
The humidity indicator should be below 30%RH. The
MSL of this product is 3.
The information furnished by Zywyn has been carefully
reviewed for accuracy and reliability. Its application or
use, however, is solely the responsibility of the user. No
responsibility of the use of this information become part
of the terms and conditions of any subsequent sales
agreement with Zywyn. Specifications are subject to
change without the responsibility for any infringement
of patents or other rights of third parties which may
result from its use. No license or proprietary rights are
granted by implication or otherwise under any patent
or patent rights of Zywyn Corporation.
Specifications subject to change without notice
2
July 2012
rev. 1.0
Zywyn Corporation
ZT3070S-ZT3078S
DC Electrical Characteristics
Unless otherwise stated, VCC = +3.3V, TA = Tmin to Tmax, typical values apply at VCC = +3.3V and TA = 25°C.
Parameter
Condition
Min
Industrial Grade
–40
3.0
Typ
Max
Units
25
85
°C
3.3
3.6
V
Operating Voltage & Temperature
Temperature
VCC Voltage Range
Supply Current
ICC, Tx and Rx active
DI=VCC/GND, DE=VCC, RE=GND, RS485 I/O=Open
1.2
1.8
mA
ICC, Tx active
DI=VCC/GND, DE=VCC, RE=VCC, RS485 I/O=Open
1.2
1.8
mA
ICC, Rx active
DI=VCC/GND, DE=GND, RE=GND, RS485 I/O=Open
1.2
1.8
mA
ISD, Shutdown Current
DI=VCC/GND, DE = GND, RE = VCC, RS485 I/O=Open
0.05
10
μA
Input Threshold Low, VIL
VCC = +5.0V, DE, DI, and RE
1.4
0.8
V
Input Threshold High, VIH
VCC = +5.0V, DE, DI, and RE
TTL LOGIC Input, Driver
2
1.4
V
TTL LOGIC Output, Receiver
Output Voltage Low, VOL
IOUT = +4mA, Input Differential Voltage = 200mV
Output Voltage High, VOH
IOUT = –4mA, Input Differential Voltage = 200mV
Output Leakage Current
Receiver Outputs Disabled, VOUT = 0.4V to 2.4V
Short Circuit Current
VOUT = 0V to VCC
0.4
VCC-0.3
V
V
±0.05
±7
±1
μA
±95
mA
125
μA
-75
μA
0.2
V
Receiver Input
Input Current
DE = 0V, VCC = 0V to 3.6V, VIN = +12V
DE = 0V, VCC = 0V to 3.6V, VIN = –7V
Differential Threshold Voltage, VTH
VCM = 0V, VCC=+5.0V, TA=25°C
Input Hysteresis
VCM = 0V
Input Resistance, RIN
VCM = -7V to +12V
–0.2
20
mV
96
kΩ
Transmitter Output
Differential Output Voltage, VOD1
No Load
VCC
V
Differential Output Voltage, VOD2
With RL = 50Ω, Refer to Figure 1. (RS422)
2
VCC
V
With RL = 27Ω, Refer to Figure 1. (RS485)
1.5
VCC
V
Driver Common Mode Output, VOC
With RL = 27Ω or 50Ω. CL = 50pF. Refer to Figure 3.
3
V
Change in Voltage Magnitude for
Differential States, ΔVOD
Differential Output Voltage, with RL = 27Ω or 50Ω,
Refer to Figure 1
0.2
V
Change in Voltage Magnitude for
Common Mode States, ΔVOC
Common-Mode Output Voltage, with RL = 27Ω or 50Ω.
Refer to Figure 2.
0.2
V
Transmitter Short-Circuit Current
Output HIGH, VOUT= -7V to +12V. Refer to Figure 7.
250
mA
Output LOW, VOUT= -7V to +12V. Refer to Figure 7.
250
mA
Output Leakage Current, Full Duplex
VIN = +12V, DE=GND, VCC=0V or 3.6V
125
μA
VIN = -7V, DE=GND, VCC=0V or 3.6V
Zywyn
-100
μA
Specifications subject to change without notice
3
July 2012
rev. 1.0
Zywyn Corporation
ZT3070S-ZT3078S
AC Electrical Characteristics (ZT3076S, ZT3077S, ZT3078S)
Unless otherwise stated, VCC = +3.3V, TA = Tmin to Tmax, typical values apply at VCC = +3.3V and TA = 25°C.
Parameter
Condition
Min
Typ
Max
Units
Transmitter Timing
Transmitter Propagation tPLH
RDIFF = 54Ω, CL = 50pF. Refer to Figure 4.
35
75
ns
Transmitter Propagation tPHL
RDIFF = 54Ω, CL = 50pF. Refer to Figure 4.
35
75
ns
Transmitter Output Skew tSK
|tPLH - tPHL|
3
15
ns
Transmitter Rise/Fall Time
tr, tf, RDIFF = 54Ω, CL = 50pF, Refer to Figure 4.
15
25
ns
Transmitter Output Enable
To Output HIGH, CL = 50pF, RL = 110Ω. Refer to Figure 5.
200
ns
To Output LOW, CL = 50pF, RL = 110Ω. Refer to Figure 6.
200
ns
Transmitter Output Disable
From Output HIGH, CL = 50pF, RL = 110Ω. Refer to Figure 5.
200
ns
From Output LOW, CL = 50pF, RL = 110Ω. Refer to Figure 6.
200
ns
Receiver Timing
Receiver Propagation tPLH
CL = 15pF, Refer to Figure 9.
50
100
ns
Receiver Propagation tPHL
CL = 15pF, Refer to Figure 9.
50
100
ns
Differential Receiver Skew tSK
|tPLH - tPHL|
30
ns
Receiver Output Enable
To Output HIGH, CL = 15pF. Refer to Figure 10.
50
ns
To Output LOW, CL = 15pF. Refer to Figure 11.
50
ns
From Output HIGH, CL = 15pF. Refer to Figure 10.
50
ns
From Output LOW, CL = 15pF. Refer to Figure 11.
50
ns
Receiver Output Disable
Shutdown Timing (ZT3076S and ZT3078 ONLY)
Time to Shutdown, tSHDN
50
600
ns
Transmitter Enable from
SHUTDOWN to Output HIGH
CL = 50pF, RL = 110Ω. Refer to Figure 5.
200
ns
Transmitter Enable from
SHUTDOWN to Output LOW
CL = 50pF, RL = 110Ω. Refer to Figure 6.
200
ns
Receiver Enable from
SHUTDOWN to Output HIGH
CL = 15pF, RL = 1kΩ. Refer to Figure 11.
200
ns
Receiver Enable from
SHUTDOWN to Output LOW
CL = 15pF, RL = 1kΩ. Refer to Figure 11.
200
ns
Transceiver Throughput
Maximum Data Rate
RL = 54Ω, CL = 50pF, TA = 25°C.
16
Mbps
ESD Tolerance
ESD HBM
RS485 Inputs and Outputs
±15
kV
ESD HBM(1)
All Pins
±4
kV
(1) Tested in accordance with JEDEC Standard 22, Test Method A114-A and IEC 60749-26
Zywyn
Specifications subject to change without notice
4
July 2012
rev. 1.0
Zywyn Corporation
ZT3070S-ZT3078S
AC Electrical Characteristics (ZT3073S, ZT3074S, and ZT3075S)
Unless otherwise stated, VCC = +3.3V, TA = Tmin to Tmax, typical values apply at VCC = +3.3V and TA = 25°C.
Parameter
Condition
Min
Typ
Max
Units
Transmitter Timing
Transmitter Propagation tPLH
RDIFF = 54Ω, CL = 50pF. Refer to Figure 4.
180
800
ns
Transmitter Propagation tPHL
RDIFF = 54Ω, CL = 50pF. Refer to Figure 4.
180
800
ns
100
ns
200
800
ns
Transmitter Output Skew tSK
|tPLH - tPHL|
Transmitter Rise/Fall Time
tr, tf, RDIFF = 54Ω, CL = 50pF, Refer to Figure 4.
Transmitter Output Enable
To Output HIGH, CL = 50pF, RL = 110Ω. Refer to Figure 5.
To Output LOW, CL = 50pF, RL = 110Ω. Refer to Figure 6.
200
ns
Transmitter Output Disable
From Output HIGH, CL = 50pF, RL = 110Ω. Refer to Figure 5.
200
ns
From Output LOW, CL = 50pF, RL = 110Ω. Refer to Figure 6.
200
ns
200
ns
Receiver Timing
Receiver Propagation tPLH
CL = 15pF, Refer to Figure 9.
200
ns
Receiver Propagation tPHL
CL = 15pF, Refer to Figure 9.
200
ns
Differential Receiver Skew tSK
|tPLH - tPHL|
30
ns
Receiver Output Enable
To Output HIGH, CL = 15pF. Refer to Figure 10.
50
ns
To Output LOW, CL = 15pF. Refer to Figure 11.
50
ns
Receiver Output Disable
From Output HIGH, CL = 15pF. Refer to Figure 10.
50
ns
From Output LOW, CL = 15pF. Refer to Figure 11.
50
ns
Shutdown Timing (ZT3073S and ZT3075 ONLY)
Time to Shutdown, tSHDN
50
600
ns
Transmitter Enable from
SHUTDOWN to Output HIGH
CL = 50pF, RL = 110Ω. Refer to Figure 5.
200
ns
Transmitter Enable from
SHUTDOWN to Output LOW
CL = 50pF, RL = 110Ω. Refer to Figure 6.
200
ns
Receiver Enable from
SHUTDOWN to Output HIGH
CL = 15pF, RL = 1kΩ. Refer to Figure 11.
200
ns
Receiver Enable from
SHUTDOWN to Output LOW
CL = 15pF, RL = 1kΩ. Refer to Figure 11.
200
ns
Transceiver Throughput
Maximum Data Rate
RL = 54Ω, CL = 50pF, TA = 25°C.
0.5
Mbps
ESD Tolerance
ESD HBM
ESD
HBM(1)
RS485 Inputs and Outputs
±15
kV
All Pins
±4
kV
(1) Tested in accordance with JEDEC Standard 22, Test Method A114-A and IEC 60749-26
Zywyn
Specifications subject to change without notice
5
July 2012
rev. 1.0
Zywyn Corporation
ZT3070S-ZT3078S
AC Electrical Characteristics (ZT3070S, ZT3071S and ZT3072S)
Unless otherwise stated, VCC = +3.3V, TA = Tmin to Tmax, typical values apply at VCC = +3.3V and TA = 25°C.
Parameter
Condition
Min
Typ
Max
Units
Transmitter Timing
Transmitter Propagation tPLH
RDIFF = 54Ω, CL = 50pF. Refer to Figure 4.
250
800
1500
ns
Transmitter Propagation tPHL
RDIFF = 54Ω, CL = 50pF. Refer to Figure 4.
250
800
1500
ns
Transmitter Output Skew tSK
|tPLH - tPHL|
Transmitter Rise/Fall Time
tr, tf, RDIFF = 54Ω, CL = 50pF, Refer to Figure 4.
Transmitter Output Enable
To Output HIGH, CL = 50pF, RL = 110Ω. Refer to Figure 5.
To Output LOW, CL = 50pF, RL = 110Ω. Refer to Figure 6.
200
ns
Transmitter Output Disable
From Output HIGH, CL = 50pF, RL = 110Ω. Refer to Figure 5.
200
ns
From Output LOW, CL = 50pF, RL = 110Ω. Refer to Figure 6.
200
ns
350
200
ns
1600
ns
200
ns
Receiver Timing
Receiver Propagation tPLH
CL = 15pF, Refer to Figure 9.
200
ns
Receiver Propagation tPHL
CL = 15pF, Refer to Figure 9.
200
ns
Differential Receiver Skew tSK
|tPLH - tPHL|
30
ns
Receiver Output Enable
To Output HIGH, CL = 15pF. Refer to Figure 10.
50
ns
To Output LOW, CL = 15pF. Refer to Figure 11.
50
ns
Receiver Output Disable
From Output HIGH, CL = 15pF. Refer to Figure 10.
50
ns
From Output LOW, CL = 15pF. Refer to Figure 11.
50
ns
Shutdown Timing (ZT3070S and ZT3072S ONLY)
Time to Shutdown, tSHDN
50
600
ns
Transmitter Enable from
SHUTDOWN to Output HIGH
CL = 50pF, RL = 110Ω. Refer to Figure 5.
200
ns
Transmitter Enable from
SHUTDOWN to Output LOW
CL = 50pF, RL = 110Ω. Refer to Figure 6.
200
ns
Receiver Enable from
SHUTDOWN to Output HIGH
CL = 15pF, RL = 1kΩ. Refer to Figure 11.
200
ns
Receiver Enable from
SHUTDOWN to Output LOW
CL = 15pF, RL = 1kΩ. Refer to Figure 11.
200
ns
Transceiver Throughput
Maximum Data Rate
RL = 54Ω, CL = 50pF, TA = 25°C.
0.25
Mbps
ESD Tolerance
ESD HBM
ESD
HBM(1)
RS485 Inputs and Outputs
±15
kV
All Pins
±4
kV
(1) Tested in accordance with JEDEC Standard 22, Test Method A114-A and IEC 60749-26
Zywyn
Specifications subject to change without notice
6
July 2012
rev. 1.0
Zywyn Corporation
ZT3070S-ZT3078S
Pin Description
Pin Numbers
ZT3072S
ZT3075S
ZT3078S
Name
Full Duplex
Half Duplex
ZT3071S
ZT3074S
ZT3077S
Description
ZT3070S
ZT3073S
ZT3076S
Receiver Output. If A>B by
200mV, then RO = HIGH; If
A<B by 200mV, then
RO = LOW
1
2
2
RO
2
n/a
3
RE
3
n/a
4
DE
4
3
5
DI
5
4
6, 7
GND
n/a
5
9
Y
Non-inverting transmitter output
n/a
6
10
Z
Inverting transmitter output
6
n/a
n/a
A
Non-inverting transmitter output
and non-inverting receiver
input.
n/a
8
12
A
7
n/a
n/a
B
Receiver Output Enable.
Low active input.
RO is high-Z when
RE = HIGH
Driver Output Enable.
The transmitter outputs, Y and
Z, are enabled when DE =
HIGH. The outputs are high-Z
when DE = LOW.
Driver Input. A low on DI
forces output Y low and output
Z high. A high on DI will bring
output Y high and output Z low
Analog Ground
Non-inverting receiver
input.
Inverting transmitter output
and inverting receiver
input.
n/a
7
11
B
Inverting receiver input
8
1
14
VCC
Power Supply Input, 3.3V ±10%
n/a
n/a
1, 8, 13
NC
No Connect, Not internally
connected
Zywyn
Specifications subject to change without notice
7
July 2012
rev. 1.0
Zywyn Corporation
ZT3070S-ZT3078S
Circuit Description
Bus Configuration
The ZT3070S, ZT3071S, ZT3073S, ZT3074S, ZT3076S, and
ZT3077S are full-duplex transceivers, while the ZT3072S,
ZT3075S, and ZT3078S are half-duplex.
For full duplex, the devices are used as a four-wire bus transceiver with a configuration that the transmitters and receivers
are moving data independent of each other. Transmit can
occur on a dedicated two-wire pair and receive can occur
on an adjacent two-wire pair, with each pair transferring data
at up to 16Mbps.
Half duplex is a configuration where the transmitter outputs
are connected to its receiver inputs. This application is common for two-wire interfaces where either the transmitter is
active or the receiver is active. It is common to connect the
enable inputs for the transmitter and receiver together so
that a logic HIGH will enable the transmitter and disable the
receiver. Conversely, a logic LOW will disable the transmitter
and enable the transmitter. Half-duplex configuraitons and
these devices are designed for bidirectional data transmission on multipoint twisted-pair cables for applications, such
as digital motor controllers, remote sensors and terminals,
industrial process control, security stations and environmental
control systems.
The ZT307xE family are low-power transceivers for RS-485
and RS-422 communications. The RS-485 standard is ideal
for multi-drop applications and for long-distance interfaces.
The TIA/EIA-485 specification allows up to 256 drivers and
256 receivers to be connected to a data bus, making it an
ideal choice for multi-drop applications. RS-485 transceivers are equipped with a wide (-7V to +12V) common mode
range to accommodate ground potential differences since
the cabling can be as long as 4,000 feet. As RS-485 is a
differential interface, data is virtually immune to noise in the
transmission line.
The ZT3070S, ZT3071S, ZT3072S, ZT3073S, ZT3074S, and
ZT3075S are slew-rate limited, minimizing EMI and reducing
reflections caused by improperly terminated cables.
RS-485 Transmitters
Each device in the ZT307xE family contains a differential
output line transmitter that can drive voltage into multiple
loads on a terminated two-wire pair, and a receiver that accepts a differential voltage down to 200mV. The transmitter's
differential output can comply with RS-485 and also RS-422
standards. The typical voltage output swing with no load is
0V to VCC. With worst case loading of 54 ohms across the
differential outputs, the drivers can maintain greater than 1.5V
voltage levels, which is more than adequate for a differential
receiver to acknowledge a logic state. The 54 ohms is the
equivalent of two 120 ohm termination resistors placed on
each side of the transmission line and the input impedance
of 256 receivers on the line.
The ZT3072S, ZT3075S, and ZT3078S transmitter have an
enable control line which is active HIGH. A logic HIGH on DE
(pin 3) will enable the differential outputs. A logic LOW on DE
(pin 3) will disable the transmitter outputs. While disabled,
the transmitter outputs are in high impedance.
ESD Immunity
Electro-Static Discharge (ESD) is an important factor when
implementing a serial port into a system, especially in harsh
environmental conditions. These industrial strength devices
provide extra protection against ESD and are intended for
harsh environments where high-speed data communication
is important.
All of the ZT307xE family of transceivers incorporate internal protection structures on all pins to protect against ESD
charges encountered during handling and assembly. The
driver outputs and receiver inputs have extra protection
against static electricity as they are directly interfacing to
the outside environment. As such, these pins against ESD
of ±15kV without damage in all states of the transceiver's
operation from normal to powered down. After multiple
ESD events, Zywyn’s ZT307xE family of transceivers keep
working without latchup. These devices eliminate the need
for external transient suppressor diodes and the associated
high capacitance loading, allowing reliable high-speed data
communications.
The Human Body Model has been the generally accepted
ESD testing method for semiconductors. This test is intended
to simulate the human body’s potential to store electrostatic
energy and discharge it to an integrated circuit upon close
proximity or contact. This method will test the IC’s capability
to withstand an ESD transient during normal handling such
as in manufacturing areas where the ICs tend to be handled
frequently.
RS-485 Receivers
Each transceiver contains one differential receiver that has
an input sensitivity of 200mV. The input impedance of the
receivers is typically 96 kohms. A wide common mode range
of -7V to +12V allows for large ground potential differences
between systems.
The ZT3072S, ZT3075S, and ZT3078S receivers have a enable control input. A logic LOW on RE will enable the receiver,
a logic HIGH on RE will disable the receiver. The receivers
are equipped with the fail-safe feature, which guarantees that
the receiver output will be in a HIGH state when the input
is left unconnected. This applies for both cases where the
receiver inputs are either shorted or open.
The ZT3076S, ZT3077S, and ZT3078S can transmit and
receive at data rates up to 16Mbps. The ZT3070S, ZT3071S,
and ZT3072S are specified for data rates up to 250kbps and
the ZT3073S, ZT3074S, and ZT3075S are specified for data
rates up to 500kbps.
Zywyn
Specifications subject to change without notice
8
July 2012
rev. 1.0
Zywyn Corporation
ZT3070S-ZT3078S
Hot-Swap
When a circuit board is plugged into a powered backplane,
there is a period of time in which the processor is unable to
drive the RS-485 enable lines (DE, RE) to a defined logic
state. Leakage current or parasitic coupling may prematurely enable the transceiver which causes disturbances to
the data bus and leads to data errors. By monitoring Vcc
during power-up and power-down, the hot-swap circuitry
incorporated in ZT1308xS holds DE low and RE high,
disables Tx and RX outputs until Vcc reaches 2V or above,
and therefore prevents the transceiver from prematurely
driving the data bus. After the power-up sequence, the
processor becomes stabilized and drives the DE and RE
to proper states.
Zywyn
Specifications subject to change without notice
9
July 2012
rev. 1.0
Zywyn Corporation
ZT3070S-ZT3078S
Function Table
ZT3072S/ZT3075S/ZT3078S
DRIVER
RECEIVER
Outputs
B
Differential Inputs
VID = VA - VB
Enable
RE
Output
RO
H
L
VID ≤ -0.2V
L
L
H
L
H
-0.2V < VID < +0.2V
L
U
X
L
Z
Z
+0.2V ≤ VID
L
H
Open
H
H
L
X
H
Z
X
Open
Z
Z
X
Open
Z
Input
DI
Enable
DE
A
H
H
L
ZT3071S/ZT3074S/ZT3077S
DRIVER
RECEIVER
Outputs
Z
Differential Inputs
VID = VA - VB
Output
RO
H
L
VID ≤ -0.2V
L
L
L
H
-0.2V < VID < +0.2V
U
X
Z
Z
+0.2V ≤ VID
H
Open
H
L
X
Z
X
Z
Z
X
Z
Input
DI
Y
H
ZT3070S/ZT3073/ZT3076S
DRIVER
RECEIVER
Outputs
Z
Differential Inputs
VID = VA - VB
Enable
RE
Output
RO
H
L
VID ≤ -0.2V
L
L
H
L
H
-0.2V < VID < +0.2V
L
U
X
L
Z
Z
+0.2V ≤ VID
L
H
Open
H
H
L
X
H
Z
X
Open
Z
Z
X
Open
Z
Input
DI
Enable
DE
Y
H
H
L
Note:
H = High Level; L = Low Level; Z = High Impedance; X = Irrelevant; U = Undetermined State.
Zywyn
Specifications subject to change without notice
10
July 2012
rev. 1.0
Zywyn Corporation
ZT3070S-ZT3078S
Pin Configuration
ZT3072S/ZT3075S/ZT3078S
8-Pin PDIP/nSOIC/
MSOP
ZT3071S/ZT3074S/ZT3077S
8-Pin PDIP/nSOIC/
MSOP
ZT3070S/ZT3073S/ZT3076S
14-Pin PDIP/nSOIC
Typical Application Circuits
Up to
256 Transceivers
on the bus
Notes:
A. The bus should be terminated at both ends in its characteristic impedance of RT = ZO.
B. Stub lengths off the main bus should be kept as short as possible.
C. Can connect up to 256 devices on the same common bus
Zywyn
Specifications subject to change without notice
11
July 2012
rev. 1.0
Zywyn Corporation
ZT3070S-ZT3078S
Typical Test Circuits
Notes:
A. The test load capacitance includes probe and test jig capacitance, unless otherwise specified.
B. The signal generator had the following characteristics:
Pulse rate = Data rate at 50% duty cyle, ZO = 50Ω , tr & tf < 6ns, unless otherwise specified.
++12V
Figure 1. Driver Test Circuit, VOD and VOC Without
Common-Mode Loading
Figure 2. Driver Test Circuit, VOD With CommonMode Loading
3.25V
1.75V
Figure 3. Driver Common-Mode Output Voltage (VOC) Test Circuit and Waveforms
Figure 4. Driver Differential Output Voltage (VOD) Switching Test Circuit and Waveforms
CL
Figure 5. Driver Enable/Disable Test Circuit and Waveforms, High Output
Zywyn
Specifications subject to change without notice
12
July 2012
rev. 1.0
Zywyn Corporation
ZT3070S-ZT3078S
Typical Test Circuits
Vcc
CL
Vcc
Figure 6. Driver Enable/Disable Test Circuit and Waveforms, Low Output
Figure 8. Receiver Parameter Definitions
Figure 7. Driver Short-Circuit Test Configuration
Figure 9. Receiver Propagation (tPLH and tPHL)Test Circuit and Waverforms
Figure 10. Receiver Output Enable/Disable Test Circuit and Waveforms, Data Output High
Vcc
Figure 11. Receiver Output Enable/Disable Test Circuit and Waveforms, Data Output Low
Zywyn
Specifications subject to change without notice
13
July 2012
rev. 1.0
Zywyn Corporation
ZT3070S-ZT3078S
Equivalent Input and Output Schematic Diagrams
Vcc
VCC
200kΩ
500Ω
500Ω
Input
Input
7V
7V
200kΩ
B Input
A Input
VCC
VCC
35kΩ
15V
35kΩ
15V
181kΩ
181kΩ
Input
Input
15V
15V
35kΩ
35kΩ
Receiver Output
VCC
VCC
15V
5
Output
Output
7V
15V
Zywyn
Specifications subject to change without notice
14
July 2012
rev. 1.0
Zywyn Corporation
ZT3070S-ZT3078S
Typical Performance Characteristics
Output C urrent vs
R eceiver Output H igh V oltage
Output C urrent vs
R eceiver Output Low V oltage
30
40
25
O u tp u t C u rre n t (m A )
O u tp u t C u rre n t (m A )
35
30
25
20
15
10
20
15
10
5
5
0
0
0
1
2
3
4
0
1
Re ce ive r O utput Low V olta ge (V )
2
3
4
Re ce ive r O utput High V olta ge (V )
R eceiver Output H igh V oltage vs Tem perature
R eceiver Output Low V oltage vs Tem perature
0.25
2.84
R e c e iv e r O u t p u t H ig h ( V )
R e c e i v e r O u tp u t L o w v o l ta g e (V )
2.83
0.2
0.15
0.1
0.05
2.82
2.81
2.8
2.79
2.78
2.77
2.76
2.75
0
2.74
-60
-40
-20
0
20
40
60
80
100
120
140
-60
-40
-20
Te m pe ra ture (C°)
0
20
40
60
80
100
120
140
Te m p e ratu re (C°)
N o Load S upply C urrent vs Tem perature
D river Output C urrent vs
D ifferential Output V oltage
0.6
D riv e r O u tp u t C u rre n t (m A )
N o L o a d S u p p ly C u rre n t (m A )
100
0.5
0.4
0.3
0.2
0.1
0
10
1
0.1
0.01
-60
-40
-20
0
20
40
60
80
100
120
140
0
Te m pe ra ture (C°)
1
2
3
4
5
Diffe re ntia l O utput V olta ge (V )
Zywyn
Specifications subject to change without notice
15
July 2012
rev. 1.0
Zywyn Corporation
ZT3070S-ZT3078S
Typical Performance Characteristics
D river P ropagation D elay (250kbps) vs Tem perature
R eceiver P ropagation D elay vs Tem perature
1400
60
D r iver P r o p ag atio n D elay (n s)
R e c e iv e r P ro p a g a t io n D e la y ( n s )
70
50
40
30
20
10
1200
1000
800
600
400
200
0
0
-60
-40
-20
0
20
40
60
80
100
120
-60
140
-40
-20
0
40
60
80
100
120
140
120
140
D river P ropagation D elay (16M bps) vs Tem perature
D river P ropagation D elay (500kbps) vs Tem perature
360
8.8
350
8.75
D riv e r P ro p a g a t io n D e la y ( n s )
D riv e r P ro p a g a t io n D e la y ( n s )
20
T e mpe rature (C °)
Te m p e ratu re (C°)
340
330
320
310
300
290
8.7
8.65
8.6
8.55
8.5
8.45
8.4
-60
-40
-20
0
20
40
60
80
100
120
140
-60
Te m p e ratu re (C°)
-40
-20
0
20
40
60
80
100
Te m p e ratu re (C°)
Zywyn
Specifications subject to change without notice
16
July 2012
rev. 1.0
Zywyn Corporation
ZT3070S-ZT3078S
Package Information
8-pin PDIP
14-pin PDIP
Zywyn
Specifications subject to change without notice
17
July 2012
rev. 1.0
Zywyn Corporation
ZT3070S-ZT3078S
8-pin nSOIC
ZYWYN CORPORATION
14-pin nSOIC
Zywyn
Specifications subject to change without notice
18
July 2012
rev. 1.0
Zywyn Corporation
ZT3070S-ZT3078S
8-pin MSOP
Zywyn
Specifications subject to change without notice
19
July 2012
rev. 1.0
Zywyn Corporation
ZT3070S-ZT3078S
Ordering Information
Part Number
Temperature Range
Package Type (Green)
ZT3070SLEEN
-40°C to +85°C
14-pin Nsoic
MOQ/Tube
MOQ/T&R
100
2500
ZT3070SLEEP
-40°C to +85°C
14-pin PDIP
60
N/A
ZT3071SLEEN
-40°C to +85°C
8-pin Nsoic
100
2500
ZT3071SLEEP
-40°C to +85°C
8-pin PDIP
60
N/A
ZT3071SLEEU
-40°C to +85°C
8-pin MSOP
50
2500
ZT3072SLEEN
-40°C to +85°C
8-pin Nsoic
100
2500
ZT3072SLEEP
-40°C to +85°C
8-pin PDIP
60
N/A
ZT3072SLEEU
-40°C to +85°C
8-pin MSOP
50
2500
ZT3073SLEEN
-40°C to +85°C
14-pin Nsoic
100
2500
ZT3073SLEEP
-40°C to +85°C
14-pin PDIP
60
N/A
ZT3074SLEEN
-40°C to +85°C
8-pin Nsoic
100
2500
ZT3074SLEEP
-40°C to +85°C
8-pin PDIP
60
N/A
ZT3074SLEEU
-40°C to +85°C
8-pin MSOP
50
2500
ZT3075SLEEN
-40°C to +85°C
8-pin Nsoic
100
2500
ZT3075SLEEP
-40°C to +85°C
8-pin PDIP
60
N/A
ZT3075SLEEU
-40°C to +85°C
8-pin MSOP
50
2500
ZT3076SLEEN
-40°C to +85°C
14-pin Nsoic
100
2500
ZT3076SLEEP
-40°C to +85°C
14-pin PDIP
60
N/A
ZT3077SLEEN
-40°C to +85°C
8-pin Nsoic
100
2500
ZT3077SLEEP
-40°C to +85°C
8-pin PDIP
60
N/A
ZT3077SLEEU
-40°C to +85°C
8-pin MSOP
50
2500
ZT3078SLEEN
-40°C to +85°C
8-pin Nsoic
100
2500
ZT3078SLEEP
-40°C to +85°C
8-pin PDIP
60
N/A
ZT3078SLEEU
-40°C to +85°C
8-pin MSOP
50
2500
Please contact the factory for pricing,availabiliy on Tape-and-Reel and Die Sales options.
Zywyn
Specifications subject to change without notice
20
July 2012
rev. 1.0
Zywyn Corporation
ZT3070S-ZT3078S
Part Marking Information
TOPSIDE MARK INSTRUCTIONS:
TOPSIDE MARK INSTRUCTIONS:
Line 1
Notch
SP491EEP
ZT3071SLEEN
YYWW
YYWW
ZT30
SP491EEP
78LSU
YYWW
YYWW
Line 2
Notch
Line 3
Line 1
Line 2
Line 3
P in 1 Indicator and
ESD Designator
Pin 1 Indicator and
ESD Designator
Line 1:
Line 2:
Line 3:
Note:
Zywyn (logo)
Zywyn Part Number "ZT3071SLEEN"
Date Code: (Last 2 digits of Prod. Year & Prod. Work Week)
Pin # 1 " " Indicator Required
Line 1:
Line 2:
Line 3:
Note:
Zywyn Part Name "ZT30"
Zywyn Part Number "78SLU"
Date Code: (Last 2 digits of Prod. Year & Prod. Work Week)
Pin # 1 " " Indicator Required if no mold dimple
BOTTOMSIDE MARK INSTRUCTIONS:
BOTTOMSIDE MARK INSTRUCTIONS:
Frontside
Notch
Country Of Origin
Lot#
Line 1
Frontside
Notch
Line 2
Line 1: Country of Origin (optional if Country of Origin is in Ejector Pin)
Line 2: Lot Number
Country Of Origin
Lot#
Line 1
Line 2
Line 1: Country of Origin (optional if Country of Origin is in Ejector Pin)
Line 2: Lot Number
8/14-pin PDIP or 8/14-pin nSOIC
8-pin MSOP
Zywyn Corporation
Headquarters and Sales Office
1270 Oakmead Parkway, Suite 201 • Sunnyvale, CA 94085 • Tel: (408) 733-3225 • Fax: (408) 733-3206
Email: sales@zywyn.com • www.zywyn.com
Zywyn Corporation reserves the right to make any changes to any products described herein without notice. Zywyn does not assume any liability arising
out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others.
© 2012 Zywyn Corporation
Zywyn
Specifications subject to change without notice
21
July 2012
rev. 1.0
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