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DS26C31M
,
DS26C31T
SNLS375C –JUNE 1998–REVISED JANUARY 2015
DS26C31x CMOS Quad Tri-State Differential Line Driver
1 Features 3 Description
The DS26C31 device is a quad differential line driver
1• TTL Input Compatible designed for digital data transmission over balanced
• Typical Propagation Delays: 6 ns lines. The DS26C31T meets all the requirements of
• Typical Output Skew: 0.5 ns EIA standard RS-422 while retaining the low power
characteristics of CMOS. The DS26C31M is
• Outputs Will Not Load Line When VCC =0V compatible with EIA standard RS-422; however, one
• DS26C31T Meets the Requirements of EIA exception in test methodology is taken(2). This
Standard RS-422 enables the construction of serial and terminal
• Operation From Single 5-V Supply interfaces while maintaining minimal power
consumption.
• Tri-State Outputs for Connection to System Buses
• Low Quiescent Current The DS26C31 accepts TTL or CMOS input levels and
translates these to RS-422 output levels. This part
• Available in Surface Mount uses special output circuitry that enables the drivers
• Mil-Std-883C Compliant to power down without loading down the bus. This
device has enable and disable circuitry common to all
2 Applications four drivers. The DS26C31 is pin compatible to the
Differential Line Driver for RS-422 Applications AM26LS31 and the DS26LS31.
All inputs are protected against damage due to
electrostatic discharge by diodes to VCC and ground.
Device Information(1)
PART NUMBER PACKAGE BODY SIZE (NOM)
SNLS3759577 9.90 mm × 3.91 mm
DS26C31M PDIP (16) 19.304 mm × 6.35 mm
SNLS3759577 9.90 mm × 3.91 mm
DS26C31T PDIP (16) 19.304 mm × 6.35 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
(2) The DS26C31M (−55°C to 125°C) is tested with VOUT
between 6 V and 0 V while RS-422A condition is 6 V and
−0.25 V.
4 Device Logic Diagram
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.
DS26C31M
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DS26C31T
SNLS375C –JUNE 1998–REVISED JANUARY 2015
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Table of Contents
9.2 Functional Block Diagram....................................... 13
1 Features.................................................................. 19.3 Feature Description................................................. 13
2 Applications ........................................................... 19.4 Device Functional Modes........................................ 13
3 Description............................................................. 110 Application and Implementation........................ 14
4 Device Logic Diagram ........................................... 110.1 Application Information.......................................... 14
5 Revision History..................................................... 210.2 Typical Application................................................ 14
6 Pin Configuration and Functions......................... 311 Power Supply Recommendations ..................... 16
7 Specifications......................................................... 412 Layout................................................................... 16
7.1 Absolute Maximum Ratings ...................................... 412.1 Layout Guidelines ................................................. 16
7.2 Recommended Operating Conditions....................... 412.2 Layout Example .................................................... 16
7.3 DC Electrical Characteristics .................................... 513 Device and Documentation Support................. 17
7.4 Switching Characteristics ......................................... 613.1 Related Links ........................................................ 17
7.5 Comparison Table of Switching Characteristics into 13.2 Trademarks........................................................... 17
“LS-Type” Load.......................................................... 613.3 Electrostatic Discharge Caution............................ 17
7.6 Typical Characteristics.............................................. 713.4 Glossary................................................................ 17
8 Parameter Measurement Information ................ 11 14 Mechanical, Packaging, and Orderable
9 Detailed Description............................................ 13 Information ........................................................... 17
9.1 Overview................................................................. 13
5 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision B (April 2013) to Revision C Page
• Added 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
Changes from Revision A (April 2013) to Revision B Page
• Changed layout of National Data Sheet to TI format ............................................................................................................. 9
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SNLS375C –JUNE 1998–REVISED JANUARY 2015
6 Pin Configuration and Functions
D, NFG Package NAJ Package
16 Pins 20 Pins
Top View Top View
Pin Functions
PIN I/O DESCRIPTION
NAME NO.(1)
DIFFERENTIAL SIGNALING I/O
CHANNEL A 3, 2 O Channel A inverting and non-inverting differential driver outputs
OUTPUTS (–, +)
CHANNEL B 5, 6 O Channel B inverting and non-inverting differential driver outputs
OUTPUTS (–, +)
CHANNEL C 11, 10 O Channel C inverting and non-inverting differential driver outputs
OUTPUTS (–, +)
CHANNEL D 13, 14 O Channel D inverting and non-inverting differential driver outputs
OUTPUTS (–, +)
INPUT A 1 I TTL/CMOS compatible input for channel A
INPUT B 7 I TTL/CMOS compatible input for channel B
INPUT C 9 I TTL/CMOS compatible input for channel C
INPUT D 15 I TTL/CMOS compatible input for channel D
CONTROL PINS
ENABLE 4 I Logic-high ENABLE Control
ENABLE 12 I Logic-low ENABLE Control
POWER
GND 8 — GND Pin
VCC 16 — Supply pin, provide 5 V supply
(1) Pin numbers correspond to PDIP and SOIC packages.
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7 Specifications
7.1 Absolute Maximum Ratings(1)(2)(3)
MIN MAX UNIT
Supply Voltage (VCC)−0.5 7 V
DC Input Voltage (VIN)−1.5 VCC +1.5 V
DC Output Voltage (VOUT)−0.5 7 V
Clamp Diode Current (IIK, IOK) –20 20 mA
DC Output Current, per pin (IOUT) –150 150 mA
DC VCC or GND Current, per pin (ICC)
Max Power Dissipation (PD) at 25°C(4) Ceramic “NFE” package 2419 mW
Plastic “NFG” package 1736 mW
SOIC “D” package 1226 mW
Ceramic “NAD” package 1182 mW
Ceramic “NAJ” package 2134 mW
Lead Temperature (TL) (Soldering, 4 s) 260 °C
Storage Temperature, Tstg −65 150 °C
(1) 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.
(2) Unless otherwise specified, all voltages are referenced to ground. All currents into device pins are positive, all currents out of device
pins are negative.
(3) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and
specifications.
(4) Ratings apply to ambient temperature at 25°C. Above this temperature derate NFG package at 13.89 mW/°C, NFE package 16.13
mW/°C, D package 9.80 mW/°C, NAJ package 12.20 mW/°C, and NAD package 6.75 mW/°C.
7.2 Recommended Operating Conditions MIN MAX UNIT
Supply Voltage (VCC) 4.50 5.50 V
DC Input or Output Voltage (VIN, VOUT) 0 VCC V
Operating Temperature Range (TA) DS26C31T −40 85 °C
DS26C31M −55 125 °C
Input Rise or Fall Times (tr, tf) 500 ns
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7.3 DC Electrical Characteristics
VCC = 5 V ± 10% (unless otherwise specified)(1)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
VIH High Level Input Voltage 2.0 V
VIL Low Level Input Voltage 0.8 V
VOH High Level Output Voltage VIN = VIH or VIL, 2.5 3.4 V
IOUT =−20 mA
VOL Low Level Output Voltage VIN = VIH or VIL, 0.3 0.5 V
IOUT = 20 mA
VTDifferential Output Voltage RL= 100 Ω2.0 3.1 V
See(2)
|VT|−|VT| Difference In Differential Output RL= 100 Ω0.4 V
See(2)
VOS Common Mode Output Voltage RL= 100 Ω1.8 3.0 V
See(2)
|VOS −VOS | Difference In Common Mode RL= 100 Ω0.4 V
Output See(2)
IIN Input Current VIN = VCC, GND, VIH, or VIL ±1.0 μA
ICC Quiescent Supply Current(3) DS26C31T VIN = VCC or GND 200 500 μA
IOUT = 0 μA VIN = 2.4 V or 0.5 V(3) 0.8 2.0 mA
DS26C31M VIN = VCC or GND 200 500 μA
IOUT = 0 μA VIN = 2.4 V or 0.5 V(3) 0.8 2.1 mA
IOZ TRI-STATE Output Leakage VOUT = VCC or GND
Current ENABLE = VIL ±0.5 ±5.0 μA
ENABLE = VIH
ISC Output Short Circuit Current VIN = VCC or GND(2)(4) −30 −150 mA
IOFF Output Leakage Current Power DS26C31T VOUT = 6 V 100 μA
Off(2) VCC = 0 V VOUT =−0.25 V −100 μA
DS26C31M VOUT = 6 V 100 μA
VCC = 0 V VOUT = 0 V(5) −100 μA
(1) Unless otherwise specified, min/max limits apply across the recommended operating temperature range. All typicals are given for VCC =
5 V and TA= 25°C.
(2) See EIA Specification RS-422 for exact test conditions.
(3) Measured per input. All other inputs at VCC or GND.
(4) This is the current sourced when a high output is shorted to ground. Only one output at a time should be shorted.
(5) The DS26C31M (−55°C to +125°C) is tested with VOUT between +6 V and 0 V while RS-422A condition is +6 V and −0.25 V.
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7.4 Switching Characteristics
VCC = 5 V ±10%, tr≤6 ns, tf≤6 ns (Figure 22,Figure 23,Figure 24,Figure 25)(1)
DS26C31T DS26C31M
PARAMETER TEST CONDITIONS MIN TYP UNIT
MAX MAX
tPLH, tPHL Propagation Delays Input to Output S1 Open 2 6 11 14 ns
Skew (2) S1 Open 0.5 2.0 3.0 ns
tTLH, tTHL Differential Output Rise And Fall S1 Open 6 10 14 ns
Times
tPZH Output Enable Time S1 Closed 11 19 22 ns
tPZL Output Enable Time S1 Closed 13 21 28 ns
tPHZ Output Disable Time(3) S1 Closed 5 9 12 ns
tPLZ Output Disable Time(3) S1 Closed 7 11 14 ns
CPD Power Dissipation Capacitance(4) 50 pF
CIN Input Capacitance 6 pF
(1) Unless otherwise specified, min/max limits apply across the recommended operating temperature range. All typicals are given for VCC =
5 V and TA= 25°C.
(2) Skew is defined as the difference in propagation delays between complementary outputs at the 50% point.
(3) Output disable time is the delay from ENABLE or ENABLE being switched to the output transistors turning off. The actual disable times
are less than indicated due to the delay added by the RC time constant of the load.
(4) CPD determines the no load dynamic power consumption, PD= CPD VCC2 f + ICC VCC, and the no load dynamic current consumption, IS
= CPD VCC f + ICC.
7.5 Comparison Table of Switching Characteristics into “LS-Type” Load
VCC = 5 V, TA= 25°C, tr≤6 ns, tf≤6 ns (Figure 23,Figure 25,Figure 26,Figure 27)(1)
DS26C31T DS26LS31C
TEST
PARAMETER UNIT
CONDITIONS TYP MAX TYP MAX
tPLH, tPHL Propagation Delays Input to Output CL= 30 pF
S1 Closed 6 8 10 15 ns
S2 Closed
Skew See(2) CL= 30 pF
S1 Closed 0.5 1.0 2.0 6.0 ns
S2 Closed
tTHL, tTLH Differential Output Rise and Fall CL= 30 pF
Times S1 Closed 4 6 ns
S2 Closed
tPLZ Output Disable Time(3) CL= 10 pF
S1 Closed 6 9 15 35 ns
S2 Open
tPHZ Output Disable Time(3) CL= 10 pF
S1 Open 4 7 15 25 ns
S2 Closed
tPZL Output Enable Time CL= 30 pF
S1 Closed 14 20 20 30 ns
S2 Open
tPZH Output Enable Time CL= 30 pF
S1 Open 11 17 20 30 ns
S2 Closed
(1) This table is provided for comparison purposes only. The values in this table for the DS26C31 reflect the performance of the device but
are not tested or verified.
(2) Skew is defined as the difference in propagation delays between complementary outputs at the 50% point.
(3) Output disable time is the delay from ENABLE or ENABLE being switched to the output transistors turning off. The actual disable times
are less than indicated due to the delay added by the RC time constant of the load.
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7.6 Typical Characteristics
Figure 1. Differential Propagation Delay vs Temperature Figure 2. Differential Propagation Delay vs Power Supply
Voltage
Figure 3. Differential Skew vs Temperature Figure 4. Differential Skew vs Power Supply Voltage
Figure 5. Differential Transition Time vs Temperature Figure 6. Differential Transition Time vs Power Supply
Voltage
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Typical Characteristics (continued)
Figure 7. Complementary Skew vs Temperature Figure 8. Complementary Skew vs Power Supply Voltage
Figure 9. Differential Output Voltage vs Output Current Figure 10. Differential Output Voltage vs Output Current
Figure 11. Output High Voltage vs Output High Current Figure 12. Output High Voltage vs Output High Current
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Typical Characteristics (continued)
Figure 13. Output Low Voltage vs Output Low Current Figure 14. Output Low Voltage vs Output Low Current
Figure 16. Output Low Voltage vs Output Low Current
Figure 15. Supply Current vs Temperature
Figure 17. Output Low Voltage vs Output Low Current Figure 18. Supply Current vs Temperature
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Typical Characteristics (continued)
Figure 19. Supply Current vs Power Supply Voltage Figure 20. Output Short Circuit Current vs Temperature
Figure 21. Output Short Circuit Current vs Power Supply Voltage
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8 Parameter Measurement Information
Note: C1 = C2 = C3 = 40 pF (Including Probe and Jig Capacitance), R1 = R2 = 50Ω, R3 = 500Ω.
Figure 22. AC Test Circuit
Figure 23. Propagation Delays
Figure 24. Enable and Disable Times
Input pulse; f = 1 MHz, 50%; tr≤6 ns, tf≤6 ns
Figure 25. Differential Rise and Fall Times
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Parameter Measurement Information (continued)
Figure 26. Load AC Test Circuit for “LS-Type” Load
Figure 27. Enable and Disable Times for “LS-Type” Load
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VDD
ENABLE
_______
ENABLE
GND
DS26C31x
0.1F
5.0V
INPUT A
INPUT B
INPUT C CHANNEL
C OUTPUT
INPUT D CHANNEL
D OUTPUT
CHANNEL
B OUTPUT
CHANNEL
A OUTPUT
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9 Detailed Description
9.1 Overview
The DS26C31 is a quad differential line driver designed for data transmission over balanced cable or printed
circuit board traces. The DS26C31M supports a temperature range of -55°C to 125°C, while the DS26C31T
supports a temperature range of -40°C to 85°C.
9.2 Functional Block Diagram
9.3 Feature Description
Each driver converts the TTL or CMOS signal at its input to a pair of complementary differential outputs. The
drivers are enabled when the ENABLE control pin is a logic HIGH or when the ENABLE control pin is a logic
LOW.
9.4 Device Functional Modes
Table 1. Function Table(1)
ENABLE ENABLE INPUT NON-INVERTING OUTPUT INVERTING OUTPUT
L H X Z Z
All other combinations of enable inputs L L H
H H L
(1) L = Low logic state
X = Irrelevant
H = High logic state
Z = Tri-state (high impedance)
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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
The DS26C31 is a quad differential line driver designed for applications that require long distance digital data
transmission over balanced cables. The DS26C31 can be used in applications that require conversion from TTL
or CMOS input levels to differential signal levels, compatible to RS-422. The use of complimentary signaling in a
balanced transmission media provides good immunity in the midst of noisy environments or shifts in ground
reference potential.
10.2 Typical Application
Figure 28 depicts a typical implementation of the DS26C31x device in a RS-422 application.
*RTis optional although highly recommended to reduce reflection.
Figure 28. Two-Wire Balanced System, RS-422
10.2.1 Design Requirements
• Apply TTL or LVCMOS signal to driver input lines INPUT A-D.
• Transmit complementary outputs at OUTPUT A-D.
• Use controlled-impedance transmission lines such as printed circuit board traces, twisted-pair wires or parallel
wire cable.
• Place a terminating resistor at the far end of the differential pair.
10.2.2 Detailed Design Procedure
• Connect VCC and GND pins to the power and ground planes of the PCB with a 0.1-µF bypass capacitor.
• Use TTL/LVCMOS logic levels at INPUT A-D.
• Use controlled-impedance transmission media for the differential output signals.
• Place an optional terminating resistor at the far-end of the differential pair to avoid reflection.
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Typical Application (continued)
10.2.3 Application Curves
Figure 29. No Load Supply Current vs Data Rate Figure 30. Loaded Supply Current vs Data Rate
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1
2
3
4
Via to VCC
Plane
Via to GND
Plane
Via to GND
Plane
TX Differential Pair
Bypass Capacitor
5
6
7
8
16
15
14
13
12
11
10
9
DS26C31M/DS26C31T
TX Differential Pair
TX Differential Pair
TX Differential Pair
Input
Input
Input
Input
Enable
Enable
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11 Power Supply Recommendations
It is recommended that the supply (VCC) and ground (GND) pins be connected to power planes that are placed
in the inner layers of the printed circuit board. A 0.1-µF bypass capacitor should be connect to the VCC pin such
that the capacitor is as close as possible to the device.
12 Layout
12.1 Layout Guidelines
The output differential signals of the device should be routed on one layer of the board, and clearance should be
provided in order to minimize crosstalk between differential pairs that may be running in parallel over a long
distance. Additionally, the differential pairs should have a controlled impedance with minimum impedance
discontinuities and be terminated at the far-end, near the receiver, with a resistor that is closely matched to the
differential pair impedance in order to minimize transmission line reflections. The differential pairs should be
routed with uniform trace width and spacing to minimize impedance mismatching.
12.2 Layout Example
Figure 31. DS26C31 Example Layout
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13 Device and Documentation Support
13.1 Related Links
The table below lists quick access links. Categories include technical documents, support and community
resources, tools and software, and quick access to sample or buy.
Table 2. Related Links
TECHNICAL TOOLS & SUPPORT &
PARTS PRODUCT FOLDER SAMPLE & BUY DOCUMENTS SOFTWARE COMMUNITY
DS26C31M Click here Click here Click here Click here Click here
DS26C31T Click here Click here Click here Click here Click here
13.2 Trademarks
All trademarks are the property of their respective owners.
13.3 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.
13.4 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.
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PACKAGE OPTION ADDENDUM
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Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status
(1)
Package Type Package
Drawing Pins Package
Qty Eco Plan
(2)
Lead/Ball Finish
(6)
MSL Peak Temp
(3)
Op Temp (°C) Device Marking
(4/5)
Samples
DS26C31TM LIFEBUY SOIC D 16 48 TBD Call TI Call TI -40 to 85 DS26C31TM
DS26C31TM/NOPB ACTIVE SOIC D 16 48 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 85 DS26C31TM
DS26C31TMX LIFEBUY SOIC D 16 2500 TBD Call TI Call TI -40 to 85 DS26C31TM
DS26C31TMX/NOPB ACTIVE SOIC D 16 2500 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 85 DS26C31TM
DS26C31TN LIFEBUY PDIP NFG 16 25 TBD Call TI Call TI -40 to 85 DS26C31TN
DS26C31TN/NOPB LIFEBUY PDIP NFG 16 25 Green (RoHS
& no Sb/Br) CU SN Level-1-NA-UNLIM -40 to 85 DS26C31TN
(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.
PACKAGE OPTION ADDENDUM
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Addendum-Page 2
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.
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm) B0
(mm) K0
(mm) P1
(mm) W
(mm) Pin1
Quadrant
DS26C31TMX/NOPB SOIC D 16 2500 330.0 16.4 6.5 10.3 2.3 8.0 16.0 Q1
PACKAGE MATERIALS INFORMATION
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Pack Materials-Page 1
*All dimensions are nominal
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
DS26C31TMX/NOPB SOIC D 16 2500 367.0 367.0 35.0
PACKAGE MATERIALS INFORMATION
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Pack Materials-Page 2
MECHANICAL DATA
N0016E
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N16E (Rev G)
NFG0016E
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