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DS26LS31C/DS26LS31M Quad High Speed Differential Line Driver
June 1998
DS26LS31C/DS26LS31M Quad High Speed Differential Line Driver
General Description
The DS26LS31 is a quad differential line driver designed for digital data transmission over balanced lines. The DS26LS31 meets all the requirements of EIA Standard RS-422 and Federal Standard 1020. It is designed to provide unipolar differential drive to twisted-pair or parallel-wire transmission lines. The circuit provides an enable and disable function common to all four drivers. The DS26LS31 features TRI-STATE (R) outputs and logically ANDed complementary outputs. The inputs are all LS compatible and are all one unit load.
Features
n n n n n n n n n n Output skew -- 2.0 ns typical Input to output delay -- 10 ns typical Operation from single 5V supply Outputs won't load line when VCC = 0V Four line drivers in one package for maximum package density Output short-circuit protection Complementary outputs Meets the requirements of EIA Standard RS-422 Pin compatible with AM26LS31 Available in military and commercial temperature range
Logic and Connection Diagrams
DS005778-1
Dual-In-Line Package
DS005778-2
Top View Order Number DS26LS31CM, or DS26LS31CN See NS Package M16A or N16E For Complete Military Product Specifications, refer to the appropriate SMD or MDS. Order Number DS26LS31MJ/883, DS26LS31ME/883 or DS26LS31MW/883 See NS Package E20A, J16A or W16A
TRI-STATE (R) is a registered trademark of National Semiconductor Corporation.
(c) 1998 National Semiconductor Corporation
DS005778
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Absolute Maximum Ratings (Note 2)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Input Voltage Output Voltage Output Voltage (Power OFF) Maximum Power Dissipation (Note 1) at 25C Cavity Package Molded DIP Package SO Package 7V 7V 5.5V -0.25 to 6V 1509 mW 1476 mW 1051 mW
Operating Conditions
Min Supply Voltage, VCC DS26LS31M DS26LS31 Temperature, TA DS26LS31M DS26LS31 4.5 4.75 -55 0 Max 5.5 5.25 +125 +70 Units V V C C
Note 1: Derate cavity package 10.1 mW/C above 25C; derate molded DIP package 11.9 mW/C above 25C; derate SO package 8.41 mW/C above 25C.
Electrical Characteristics (Notes 3, 4, 5)
Symbol VOH VOL VIH VIL IIL IIH II IO VCL ISC ICC Parameter Output High Voltage Output Low Voltage Input High Voltage Input Low Voltage Input Low Current Input High Current Input Reverse Current TRI-STATE Output Current Input Clamp Voltage Output Short-Circuit Current Power Supply Current All Outputs Disabled or Active VIN = 0.4V VIN = 2.7V VIN = 7V VO = 2.5V VO = 0.5V IIN = -18 mA -30 35 -40 Conditions IOH = -20 mA IOL = 20 mA Min 2.5 0.5 2.0 0.8 -200 20 0.1 20 -20 -1.5 -150 60 Typ Max Units V V V V A A mA A A V mA mA
Switching Characteristics
VCC = 5V, TA = 25C Symbol tPLH tPHL Skew tLZ tHZ tZL tZH Parameter Input to Output Input to Output Output to Output Enable to Output Enable to Output Enable to Output Enable to Output Conditions CL = 30 pF CL = 30 pF CL = 30 pF CL = 10 pF, S2 Open CL = 10 pF, S1 Open CL = 30 pF, S2 Open CL = 30 pF, S1 Open Min Typ 10 10 2.0 15 15 20 20 Max 15 15 6.0 35 25 30 30 Units ns ns ns ns ns ns ns
Note 2: "Absolute Maximum Ratings" are those values beyond which the safety of the device cannot be guaranteed. 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. Note 3: Unless otherwise specified min/max limits apply across the -55C to +125C temperature range for the DS726LS31M and across the 0C to +70C range for the DS26LS31. All typicals are given for V CC = 5V and TA = 25C. Note 4: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to ground unless otherwise specified. Note 5: Only one output at a time should be shorted.
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AC Test Circuit and Switching Time Waveforms
DS005778-3
S1 and S2 of load circuit are closed except where shown.
FIGURE 1. AC Test Circuit
DS005778-4
f = 1 MHz, tr 15 ns, tf 6 ns
FIGURE 2. Propagation Delays
DS005778-5
f = 1 MHz, tr 15 ns, tf 6 ns
FIGURE 3. Enable and Disable Times
Typical Applications
Two-Wire Balanced System, RS-422
DS005778-6
Note 6: RT is optional although highly recommended to reduce reflection.
3
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Typical Performance Characteristics
DS26LS31CN Unloaded IC vs Frequency vs TA DS26LS31 ICC vs VCC vs TA
DS005778-7
DS005778-8
DS26LS31CN VOH vs IOH vs TA
DS26LS31CN VOL vs IOL vs TA
DS005778-9
DS005778-10
DS26LS31CN VOD vs IO vs TA
DS005778-11
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5
Physical Dimensions
inches (millimeters) unless otherwise noted
Small Outline Package (M) Order Number DS26LS31CM NS Package Number M16A
Molded Dual-In-Line Package (N) Order Number DS26LS31CN NS Package Number N16E
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6
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
16 Lead Ceramic Flatpak (F) Order Number DS26LS31MW/883 NS Package Number W16A
16 Lead Ceramic Dual-in-Line Package (J) Order Number DS26LS31MJ/883 NS Package Number J16A
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DS26LS31C/DS26LS31M Quad High Speed Differential Line Driver
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
20 Lead Ceramic Leadless Chip Carrier (E) Order Number DS26LS31MJE/883 NS Package Number E20A
LIFE SUPPORT POLICY NATIONAL'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 2. A critical component in any component of a life support 1. Life support devices or systems are devices or sysdevice or system whose failure to perform can be reatems which, (a) are intended for surgical implant into sonably expected to cause the failure of the life support the body, or (b) support or sustain life, and whose faildevice or system, or to affect its safety or effectiveness. ure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user.
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National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.

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