NSC 26LS31

DS26LS31C/DS26LS31M
Quad High Speed Differential Line Driver
General Description
Features
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 RS422 and Federal Standard 1020. It is designed to provide
unipolar differential drive to twisted-pair or parallel-wire
transmission lines.
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The circuit provides an enable and disable function common
to all four drivers. The DS26LS31 features TRI-STATE ®
outputs and logically ANDed complementary outputs. The
inputs are all LS compatible and are all one unit load.
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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
00577801
Dual-In-Line Package
00577802
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 ® is a registered trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation
DS005778
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DS26LS31C/DS26LS31M Quad High Speed Differential Line Driver
June 1998
DS26LS31C/DS26LS31M
Absolute Maximum Ratings (Note 2)
Operating Conditions
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage
7V
Input Voltage
7V
Output Voltage
Molded DIP Package
1476 mW
SO Package
1051 mW
DS26LS31M
4.5
5.5
V
DS26LS31
4.75
5.25
V
−55
+125
˚C
0
+70
˚C
DS26LS31
Maximum Power Dissipation (Note 1) at 25˚C
1509 mW
Units
DS26LS31M
−0.25 to 6V
Cavity Package
Max
Temperature, TA
5.5V
Output Voltage (Power OFF)
Min
Supply Voltage, VCC
Note 1: Derate cavity package 10.1 mW/˚C above 25˚C; derate molded DIP
package 11.9 mW/˚C above 25˚C; derate SO package 8.41 mW/˚C above
25˚C.
Electrical Characteristics (Notes 3, 4, 5)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
VOH
Output High Voltage
IOH = −20 mA
VOL
Output Low Voltage
IOL = 20 mA
VIH
Input High Voltage
VIL
Input Low Voltage
IIL
Input Low Current
VIN = 0.4V
IIH
Input High Current
VIN = 2.7V
20
µA
II
Input Reverse Current
VIN = 7V
0.1
mA
IO
TRI-STATE Output Current
VO = 2.5V
20
µA
VO = 0.5V
−20
µA
VCL
Input Clamp Voltage
ISC
Output Short-Circuit Current
ICC
Power Supply Current
2.5
V
0.5
2.0
V
V
−40
IIN = −18 mA
−30
All Outputs Disabled
0.8
V
−200
µA
−1.5
V
−150
mA
60
mA
35
or Active
Switching Characteristics
VCC = 5V, TA = 25˚C
Typ
Max
Units
tPLH
Symbol
Input to Output
Parameter
CL = 30 pF
Conditions
Min
10
15
ns
tPHL
Input to Output
CL = 30 pF
10
15
ns
Skew
Output to Output
CL = 30 pF
2.0
6.0
ns
tLZ
Enable to Output
CL = 10 pF, S2 Open
15
35
ns
tHZ
Enable to Output
CL = 10 pF, S1 Open
15
25
ns
tZL
Enable to Output
CL = 30 pF, S2 Open
20
30
ns
tZH
Enable to Output
CL = 30 pF, S1 Open
20
30
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 −55˚C to +125˚C temperature range for the DS726LS31M and across the 0˚C to +70˚C range
for the DS26LS31. All typicals are given for V CC = 5V and TA = 25˚C.
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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DS26LS31C/DS26LS31M
AC Test Circuit and Switching Time Waveforms
00577803
S1 and S2 of load circuit are closed except where shown.
FIGURE 1. AC Test Circuit
00577804
f = 1 MHz, tr ≤ 15 ns, tf ≤ 6 ns
FIGURE 2. Propagation Delays
00577805
f = 1 MHz, tr ≤ 15 ns, tf ≤ 6 ns
FIGURE 3. Enable and Disable Times
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DS26LS31C/DS26LS31M
Typical Applications
Two-Wire Balanced System, RS-422
00577806
Note 6: RT is optional although highly recommended to reduce reflection.
Typical Performance Characteristics
DS26LS31CN Unloaded IC vs Frequency vs TA
DS26LS31 ICC vs VCC vs TA
00577807
00577808
DS26LS31CN VOH vs IOH vs TA
DS26LS31CN VOL vs IOL vs TA
00577810
00577809
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4
DS26LS31C/DS26LS31M
Typical Performance Characteristics
(Continued)
DS26LS31CN VOD vs IO vs TA
00577811
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DS26LS31C/DS26LS31M
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
DS26LS31C/DS26LS31M
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
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