DS16F95A
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SNLS303B – NOVEMBER 2008 – REVISED APRIL 2013
DS16F95A TIA/EIA-485-A (RS-485) Extended Temperature Differential Bus Transceiver
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FEATURES
DESCRIPTION
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•
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The DS16F95A Differential Bus Transceiver is a
monolithic integrated circuit designed for bidirectional
data communication on balanced multipoint bus
transmission lines. The transceiver conforms to both
TIA/EIA-485-A and TIA/EIA-422-B standards.
1
•
•
•
•
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Extended Temperature Range to +180 °C
Conforms to TIA/EIA-485-A
Designed for Multipoint Transmission
Wide Positive and Negative I/O Bus Voltage
Range
Driver Positive and Negative Current-Limiting
High Impedance Receiver Input
Receiver Input Hysteresis of 50 mV Typical
Operates from Single 5.0V Supply
Reduced Power Consumption
Pin Compatible with DS16F95/DS3695 and
SN75176A
Available in a 8-Lead CDIP Package
The DS16F95A offers improved performance due to
the use of L-FAST bipolar technology. The L-FAST
technology allows for higher speeds and lower
currents by minimizing gate delay times. The
DS16F95A features an extended temperature range
and is offered in a rugged ceramic package.
The DS16F95A combines a TRI-STATE differential
line driver and a differential input line receiver, both of
which operate from a single 5.0V power supply. The
driver and receiver have an active Enable that can be
externally connected to function as a direction control.
The driver differential outputs and the receiver
differential inputs are internally connected to form
differential input/output (I/O) bus ports that are
designed to offer minimum loading to the bus
whenever the driver is disabled or when VCC = 0V.
These ports feature wide positive and negative
common mode voltage ranges, making the device
suitable for multipoint applications in noisy
environments.
The driver is designed to accommodate loads of up to
60 mA of sink or source current and features positive
and negative current limiting for protection from line
fault conditions.
The device is offered in a rugged 8–lead CDIP
package and is functional over the extended
temperature range of -55 °C to +180 °C.
LOGIC DIAGRAM
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008–2013, Texas Instruments Incorporated
DS16F95A
SNLS303B – NOVEMBER 2008 – REVISED APRIL 2013
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FUNCTION TABLES
Table 1. DRIVER
Driver Input
Enable
DI
DE
A
Outputs
B
H
H
H
L
L
H
L
H
X
L
Z
Z
Table 2. Receiver
Differential Inputs
Enable
Output
A–B
RE
RO
H
VID ≥ 0.2V
L
VID ≤ −0.2V
L
L
0.2V > VID >-0.2V
L
X
X
H
Z
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.
Absolute Maximum Ratings (1) (2)
Storage Temperature Range (3)
−65°C to +175°C
Lead Temperature (Soldering, 60 sec.)
300°C
Junction Temperature
+200°C
Maximum Package Power Dissipation Capacity (J)
1300 mW
Above 25°C, derate J package
8.7 mW/°C
Supply Voltage
7.0V
Input Voltage (Bus Terminal)
+15V/−10V
Enable Input Voltage
5.5V
See (4)
ESD Ratings
(1)
(2)
(3)
(4)
“Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be verified. They are not meant to imply
that the devices should be operated at these limits. The tables of “Electrical Characteristics” provide conditions for actual device
operation.
If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales office/Distributor for availability and
specifications.
Lifetime expectations for continuous operation at above 150 °C for more than 1000 hours should be verified with Texas Instruments
Reliability Engineering. Reliability report available upon request.
ESD Rating information: HBM >5kV A or B pin, all other pins > 1kV. MM > 600V A or B pin, all other pins > 50V, CDM >750V,
IEC61000–4–2 (Power On or Off) > 2kV A or B pin.
Recommended Operating Conditions (1)
Supply Voltage (VCC)
Voltage at Any Bus Terminal
Min
Typ
Max
Units
4.50
5.0
5.50
V
+12
V
(Separately or Common Mode)
−7.0
(VI or VCM)
Differential Input Voltage (VID)
Output Current HIGH (IOH)
Output Current LOW (IOL)
±12
V
Driver
−60
mA
Receiver
−400
μA
Driver
60
mA
Receiver
2
mA
+180
°C
Operating Temperature (TA)
(1)
2
-55
+25
Lifetime expectations for continuous operation at above 150 °C for more than 1000 hours should be verified with Texas Instruments
Reliability Engineering. Reliability report available upon request.
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Driver Electrical Characteristics (1) (2)
Over recommended supply voltage and operating temperature ranges, unless otherwise specified.
Parameter
Test Conditions
Typ
Max
VIH
Input Voltage HIGH
VIL
Input Voltage LOW
VIC
Input Clamp Voltage
II = −18 mA
IIH
Input Current HIGH
VI = 2.4V
IIL
Input Current Low
|VOD1|
Differential Output Voltage
|VOD2|
Differential Output Voltage
Δ|VOD|
Change in Magnitude of Differential
Output Voltage
VOC
Common Mode Output Voltage (4)
Δ|VOC|
Change in Magnitude of Common
Mode Output Voltage (3)
IO
Output Current (5) (Includes
Receiver II)
A or B, Output Disabled, VO = +12V
DE = 0.4V
VO = −7.0V
0.57
1.5
-0.43
-0.8
Short Circuit Output Current (6)
A or B
VO = −7.0V
-157
-250
VO = 0V
-115
-150
VO = VCC
112
150
VO = +12V
137
250
IOS
(1)
(2)
(3)
(4)
(5)
(6)
DI, DE
Min
2.0
V
0.8
VI = 0.4V
A-B, Figure 1
IO = 0 mA, No Load
3.6
RL = 100Ω
2.0
2.9
RL = 54Ω
1.5
2.6
RL = 54Ω or 100Ω,
See (3)
(A+B)/2, Figure 1
Units
2.5
V
-1.3
V
20
μA
-50
μA
6.0
V
V
±0.4
V
3.0
V
±0.2
V
mA
mA
Unless otherwise specified min/max limits apply across the -55°C to +180°C temperature range for the DS16F95A. All typical values are
given for VCC = 5V and TA = 25°C.
All currents into the device pins are positive; all currents out of the device pins are negative. All voltages are referenced to ground
unless otherwise specified.
Δ|VOD| and Δ|VOC| are the changes in magnitude of VOD and VOC, respectively, that occur when the input is changed from a high level
to a low level.
In TIA/EIA-422-B and TIA/EIA-485-A Standards, VOC, which is the average of the two output voltages with respect to ground, is called
output offset voltage, VOS.
Refer to TIA/EIA-485-A Standard for exact conditions.
Only one output at a time should be shorted. Do not exceed maximum junction temperature recommendations. This device does not
include thermal shutdown protection.
Driver Switching Characteristics (1)
Over recommended supply voltage and operating temperature ranges, unless otherwise specified.
Parameter
Test Conditions
Min
Typ
Max
Units
8.0
15
45
ns
8.0
15
30
ns
25
50
ns
RL = 110Ω, Figure 5
25
50
ns
RL = 110Ω, Figure 4
20
80
ns
tLZ
Output Disable Time from Low Level RL = 110Ω, Figure 5
20
80
ns
tLZL
Output Disable Time from Low Level Load per Figure 4,
with Load Resistor to GND
Timing per Figure 5
300
tSKEW
Skew (Pulse Width Distortion)
1.0
tDD
Differential Output Delay Time
tTD
Differential Output Transition Time
tZH
Output Enable Time to High Level
RL = 110Ω, Figure 4
tZL
Output Enable Time to Low Level
tHZ
Output Disable Time from High
Level
(1)
RL = 60Ω, Figure 3
RL = 60Ω, Figure 3
ns
12
ns
Unless otherwise specified min/max limits apply across the -55°C to +180°C temperature range for the DS16F95A. All typical values are
given for VCC = 5V and TA = 25°C.
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Receiver Electrical Characteristics (1) (2)
Over recommended supply voltage and operating temperature ranges, unless otherwise specified.
Parameter
Test Conditions
Min
Typ
Max
Units
0.2
V
VTH
Differential Input High
Threshold Voltage
VO = 2.7V, IO = −0.4 mA
VTL
Differential Input Low
Threshold Voltage (3)
VO = 0.5V, IO = 2.0 mA
VT+−VT−
Hysteresis (4)
VCM = 0V
35
VIH
Enable Input Voltage HIGH
RE
2.0
VIL
Enable Input Voltage LOW
VIC
Enable Input Clamp Voltage
II = −18 mA
-0.8
-1.3
V
IIH
Input Current HIGH
VIH = 2.7V
1
20
μA
IIL
Input Current LOW
-3
-50
μA
VOH
Output Voltage HIGH (RO)
VID = 200 mV, IOH = −400 μA, Figure 2
VOL
Output Voltage LOW (RO)
VID = −200 mV, IOL = 2.0 mA, Figure 2
IOS
Short Circuit Output Current (RO)
VO = 0V, (Note 9)
IOZ
High Impedance State Output (RO)
VO = 0.4V to 2.4V
II
Line Input Current
RI
(1)
(2)
(3)
(4)
(5)
(5)
Input Resistance
−0.2
V
50
mV
V
0.8
VIL = 0.4V
V
2.5
3.5
V
0.3
0.45
V
-15
-46
-85
mA
0.2
±20
μA
A or B,
Other Input = 0V
VI = +12V
0.57
1.5
VI = −7.0V
-0.43
-0.8
A or B
DE = 0.4V
18
22
12
mA
kΩ
Unless otherwise specified min/max limits apply across the -55°C to +180°C temperature range for the DS16F95A. All typical values are
given for VCC = 5V and TA = 25°C.
All currents into the device pins are positive; all currents out of the device pins are negative. All voltages are referenced to ground
unless otherwise specified.
The algebraic convention, where the less positive (more negative) limit is designated minimum, is used in this data sheet for common
mode input voltage and threshold voltage levels only.
Hysteresis is the difference between the positive-going input threshold voltage, VT+, and the negative-going input threshold voltage, VT−.
Refer to TIA/EIA-485-A Standard for exact conditions.
Receiver Switching Characteristics (1)
Over recommended supply voltage and operating temperature ranges, unless otherwise specified.
Parameter
tPLH
Propagation Delay Time,
Low-to-High Level Output
tPHL
Propagation Delay Time,
High-to-Low Level Output
tZH
Output Enable Time to High Level
tZL
Output Enable Time to Low Level
tHZ
Output Disable Time from High
Level
tLZ
Output Disable Time from Low
Level
|tPLH−tPH
L|
Pulse Width Distortion (SKEW)
(1)
4
Test Conditions
VIN = 0V to +3.0V CL = 15 pF,
Figure 6
CL = 15 pF,
Figure 7
CL = 5.0 pF,
Figure 7
Figure 6
Min
Typ
Max
Units
10
19
50
ns
10
19
50
ns
10
75
ns
12
75
ns
12
50
ns
12
50
ns
1.0
16
ns
Unless otherwise specified min/max limits apply across the -55°C to +180°C temperature range for the DS16F95A. All typical values are
given for VCC = 5V and TA = 25°C.
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Device Electrical Characteristics (1) (2)
Over recommended supply voltage and operating temperature ranges, unless otherwise specified.
Parameter
ICC
Supply Current (Total Package)
Test Conditions
No Load
All Inputs Open
ICCX
(1)
(2)
Min
Typ
Max
DE = 2V, RE = 0.8V
Outputs Enabled
21.5
28
DE = 0.8V, RE = 2V
Outputs Disabled
16
25
Units
mA
Unless otherwise specified min/max limits apply across the -55°C to +180°C temperature range for the DS16F95A. All typical values are
given for VCC = 5V and TA = 25°C.
All currents into the device pins are positive; all currents out of the device pins are negative. All voltages are referenced to ground
unless otherwise specified.
Parameter Measurement Information
Figure 1. Driver VOD and VOC (3)
Figure 2. Receiver VOH and VOL
tSKEW = |tPLHD–tPHLD|
Figure 3. Driver Differential Output Delay and Transition Times (4) (5)
(3)
(4)
(5)
All diodes are 1N916 or equivalent.
The input pulse is supplied by a generator having the following characteristics: PRR = 1.0 MHz, 50% duty cycle, tr ≤ 6.0 ns, tf ≤ 6.0 ns,
ZO = 50Ω.
DS16F95A Driver enable is Active-High.
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Figure 4. Driver Enable and Disable Times (tZH, tHZ) (6) (7) (8)
Figure 5. Driver Enable and Disable Times (tZL, tLZ, tLZL) (6) (7) (8)
Figure 6. Receiver Propagation Delay Times (6) (7)
(6)
(7)
(8)
6
The input pulse is supplied by a generator having the following characteristics: PRR = 1.0 MHz, 50% duty cycle, tr ≤ 6.0 ns, tf ≤ 6.0 ns,
ZO = 50Ω.
CL includes probe and stray capacitance.
DS16F95A Driver enable is Active-High.
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Figure 7. Receiver Enable and Disable Times (9) (10) (11)
The input pulse is supplied by a generator having the following characteristics: PRR = 1.0 MHz, 50% duty cycle, tr ≤ 6.0 ns, tf ≤ 6.0 ns,
ZO = 50Ω.
(10) CL includes probe and stray capacitance.
(11) All diodes are 1N916 or equivalent.
(9)
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FUNCTIONAL DESCRIPTION
The Differential Line Driver levels shifts standard TTL/CMOS levels to a differential voltage on the bus pins (A
and B) that conform to RS-485. The driver is enabled when the DE pin is High. The driver is disabled when the
DE pin is Low. The DI and DE pins should be driven or tied to the desired state, do not float. The differential
driver is able to source and sink up to 60mA of output current. Care should be taken that the driver is not
enabled into a fault condition where the package power dissipation capacity is exceeded. The DS16F95A
features driver current limiting (see IOS specification) to protect from certain line faults where the amount of power
is limited. This device is intended for use in rugged applications at elevated temperatures. It does not include a
Thermal Shutdown feature commonly found on RS-485 transceivers.
The Differential line Receiver levels shifts the RS-485 levels to standard TTL/CMOS levels. The receiver is
enabled when the RE pin is Low. The receiver is disabled when the RE pin is High. The RE pin should be driven
or tied to the desired state, do not float.
Typical Application
A typical application is shown below. The RS-485 network may be a simple point-to-point connection with two
nodes or a more complex one with up to 32 single unit load transceivers as shown above. Stub lengths off the
main line should be kept as short as possible to minimize reflections. The line is terminated at both ends in its
characteristic impedance (typically 100 or 120 Ohms). The RS-485 network is a bi-directional half duplex
interface.
Being a multipoint bus, it is possible for all drivers to be disabled when one or more receivers are enabled. In this
case, the receiver(s) is enabled when a valid differential voltage is not present and its output state is unknown. A
common solution is to provide external failsafe biasing to bias the line to a known state such that the enabled
receives will detect it correctly and idle with a static known state in this condition. See AN-847 (Literature Number
SNLA031) for a discussion on Failsafe biasing of differential buses.
For extended temperature applications, maximum junction temperature should be calculated. TJmax = TA +
(ThetaJA)(Power Dissipation). Theta JA is the reciprocal of the derate term ( 1 / 8.7 mW/°C or 115 °C/W).
Recommended maximum junction temperature for short duration operation is 200°C. See AN-336 (Literature
Number SNVA509) for a discussion on thermal considerations.
For maximum performance, a few system / PCB recommendations are: drive the logic inputs (DI, DE, RE) with
rail-to-rail levels. This will provide the maximum noise margins to the thresholds. A clean supply is also desirable,
a 0.1µF capacitor is recommended to be placed near the VCC pin along with a bulk capacitor. The use of power
and ground planes is also recommended. Stub lengths off the RS-485 interface should be minimized to limit
reflections. Typical interconnect impedance is 100 Ohms.
8
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Connection Diagram
Top View
Figure 8. 8-Lead CDIP Package
See Package Number NAB0008A
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REVISION HISTORY
Changes from Revision A (April 2013) to Revision B
•
10
Page
Changed layout of National Data Sheet to TI format ............................................................................................................ 9
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PACKAGE OPTION ADDENDUM
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23-Aug-2017
PACKAGING INFORMATION
Orderable Device
Status
(1)
DS16F95AJA
LIFEBUY
Package Type Package Pins Package
Drawing
Qty
CDIP
NAB
8
40
Eco Plan
Lead/Ball Finish
MSL Peak Temp
(2)
(6)
(3)
TBD
Call TI
Call TI
Op Temp (°C)
Device Marking
(4/5)
0 to 0
DS16F95AJA
(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
MECHANICAL DATA
NAB0008A
J08A (Rev M)
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ensure compliance with safety-related requirements and standards applicable to their applications. Designer may not use any TI products in
life-critical medical equipment unless authorized officers of the parties have executed a special contract specifically governing such use.
Life-critical medical equipment is medical equipment where failure of such equipment would cause serious bodily injury or death (e.g., life
support, pacemakers, defibrillators, heart pumps, neurostimulators, and implantables). Such equipment includes, without limitation, all
medical devices identified by the U.S. Food and Drug Administration as Class III devices and equivalent classifications outside the U.S.
TI may expressly designate certain products as completing a particular qualification (e.g., Q100, Military Grade, or Enhanced Product).
Designers agree that it has the necessary expertise to select the product with the appropriate qualification designation for their applications
and that proper product selection is at Designers’ own risk. Designers are solely responsible for compliance with all legal and regulatory
requirements in connection with such selection.
Designer will fully indemnify TI and its representatives against any damages, costs, losses, and/or liabilities arising out of Designer’s noncompliance with the terms and provisions of this Notice.
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2017, Texas Instruments Incorporated
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