TL/F/5255
DS26LS32C/DS26LS32M/DS26LS32AC/DS26LS33C/DS26LS33M/DS26LS33AC
Quad Differential Line Receivers
January 1996
DS26LS32C/DS26LS32M/DS26LS32AC/DS26LS33C/
DS26LS33M/DS26LS33AC Quad Differential Line
Receivers
General Description
The DS26LS32 and DS26LS32A are quad differential line
receivers designed to meet the RS-422, RS-423 and Feder-
al Standards 1020 and 1030 for balanced and unbalanced
digital data transmission.
The DS26LS32 and DS26LS32A have an input sensitivity of
200 mV over the input voltage range of g7V and the
DS26LS33 and DS26LS33A have an input sensitivity of
500 mV over the input voltage range of g15V.
Both the DS26LS32A and DS26LS33A differ in function
from the popular DS26LS32 and DS26LS33 in that input
pull-up and pull-down resistors are included which prevent
output oscillation on unused channels.
Each version provides an enable and disable function com-
mon to all four receivers and features TRI-STATEÉoutputs
with 8 mA sink capability. Constructed using low power
Schottky processing, these devices are available over the
full military and commerical operating temperature ranges.
Features
YHigh differential or common-mode input voltage ranges
of g7V on the DS26LS32 and DS26LS32A and g15V
on the DS26LS33 and DS26LS33A
Yg0.2V sensitivity over the input voltage range on the
DS26LS32 and DS26LS32A, g0.5V sensitivity on the
DS26LS33 and DS26LS33A
YDS26LS32 and DS26LS32A meet all requirements of
RS-422 and RS-423
Y6k minimum input impedance
Y100 mV input hysteresis on the DS26LS32 and
DS26LS32A, 200 mV on the DS26LS33 and
DS26LS33A
YOperation from a single 5V supply
YTRI-STATE outputs, with choice of complementary out-
put enables for receiving directly onto a data bus
Logic Diagram
TL/F/52551
Connection Diagram
Dual-In-Line Package
TL/F/52552
Top View
Truth Table
ENABLE ENABLE Input Output
0 1 X Hi-Z
See VID tVTH (Max) 1
Note Below VID sVTH (Min) 0
HI-Z eTRI-STATE
Note: Input conditions may be any combination not defined for ENABLE
and ENABLE.
Order Number DS26LS32CM, DS26LS32CN,
DS26LS32MJ, DS26LS32ACM, DS26LS32ACN,
DS26LS33CN, DS26LS33MJ or DS26LS33ACN
See NS Package Number J16A, M16A or N16A
For Complete Military 883 Specifications,
See RETS Data Sheet.
Order Number DS26LS32MJ/883, DS26LS32MW/883,
DS26LS33MJ/883, DS26LS33MW/883
See NS Package Number J16A or W16A
TRI-STATEÉis a registered trademark of National Semiconductor Corporation.
C1996 National Semiconductor Corporation RRD-B30M36/Printed in U. S. A. http://www.national.com
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Supply Voltage 7V
Common-Mode Range g25V
Differential Input Voltage g25V
Enable Voltage 7V
Output Sink Current 50 mA
Maximum Power Dissipation*at 25§C
Cavity Package 1433 mW
Molded Dip Package 1362 mW
SO Package DS26LS32 1002 mW
DS26LS32A 1051 mW
*Derate cavity package 9.6 mW/§C above 25§C; derate molded DIP package
10.9 mW/§C above 25§C.
Derate SO Package 8.01 mW/§C for DS26LS32
8.41 mW/§C for DS26LS32A
Storage Temperature Range b65§Ctoa
165§C
Lead Temperature (Soldering, 4 seconds) 260§C
Operating Conditions
Min Max Units
Supply Voltage, (VCC)
DS26LS32M, DS26LS33M 4.5 5.5 V
(MIL)
DS26LS32C, DS26LS33C 4.75 5.25 V
DS26LS32AC, DS26LS33AC
(COML)
Temperature, (TA)
DS26LS32M, DS26LS33M b55 a125 §C
(MIL)
DS26LS32C, DS26LS33C 0 a70 §C
DS26LS32AC, DS26LS33AC
(COML)
Electrical Characteristics over the operating temperature range unless otherwise specified (Notes 2, 3 and 4)
Symbol Parameter Conditions Min Typ Max Units
VTH Differential Input VOUT eVOH DS26LS32, DS26LS32A, b7V sVCM sa7V b0.2 g0.07 0.2 V
Voltage or VOL DS26LS33, DS26LS33A, b15V sVCM a15V b0.5 g0.14 0.5 V
RIN Input Resistance b15V sVCM sa15V (One Input AC GND) 6.0 8.5 kX
IIN Input Current (Under VIN e15V, Other Input b15V sVIN sa15V 2.3 mA
Test) VIN eb
15V, Other Input b15V sVIN sa15V b2.8 mA
VOH Output High Voltage VCC eMIN, DVIN e1V, Commercial 2.7 4.2 V
VENABLE e0.8V, IOH eb
440 mAMilitary 2.5 4.2 V
VOL Output Low Voltage VCC eMin, DVIN eb
1V, IOL e4 mA 0.4 V
VENABLE e0.8V IOL e8 mA 0.45 V
VIL Enable Low Voltage 0.8 V
VIH Enable High Voltage 2.0 V
VIEnable Clamp VCC eMin, IIN eb
18 mA b1.5 V
Voltage
IOOFF-State (High VCC eMax VOe2.4V 20 mA
Impedance) Output
VOe0.4V b20 mA
Current
IIL Enable Low Current VIN e0.4V b0.36 mA
IIH Enable High Current VIN e2.7V 20 mA
ISC Output Short-Circuit VOe0V, VCC eMax, DVIN e1V b15 b85 mA
Current
ICC Power Supply VCC eMax, All VIN eGND, DS26LS32, DS26LS32A 52 70 mA
Current Outputs Disabled DS26LS33, DS26LS33A 57 80 mA
IIInput High Current VIN e5.5V 100 mA
VHYST Input Hysteresis TAe25§C, VCC e5V, DS26LS32, DS26S32A 100 mV
VCM e0V DS26LS33, DS26LS33A 200 mV
Note 1: ‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the device
should be operated at these limits. The table of ‘‘Electrical Characteristics’’ provides conditions for actual device operation.
Note 2: All currents into device pins are shown as positive, all currents out of device pins are shown as negative, all voltages are referenced to ground, unless
otherwise specified. All values shown as max or min are so classified on absolute value basis.
Note 3: All typical values are VCC e5V, TAe25§C.
Note 4: Only one output at a time should be shorted.
http://www.national.com 2
Switching Characteristics VCC e5V, TAe25§C
Symbol Parameter Conditions DS26LS32/DS26LS33 DS26LS32A/DS26LS33A Units
Min Typ Max Min Typ Max
tPLH Input to Output CLe15 pF 17 25 23 35 ns
tPHL 17 25 23 35 ns
tLZ ENABLE to Output CLe5pF 2030 1530ns
t
HZ 15 22 20 25 ns
tZL ENABLE to Output CLe15 pF 15 22 14 22 ns
tZH 15 22 15 22 ns
AC Test Circuit and Switching Time Waveforms
Load Test Circuit for TRI-STATE Outputs
TL/F/52553
Propagation Delay (Notes 1 and 3)
TL/F/52554
Note 1: Diagram shown for ENABLE low.
Note 2: S1 and S2 of load circuit are closed except where shown.
Note 3: Pulse generator for all pulses: Rate e1.0 MHz; ZOe50X;t
rs6 ns; tfs6.0 ns.
Enable and Disable Times (Notes 2 and 3)
TL/F/52555
Typical Applications
Two-Wire Balanced InterfaceÐRS-422
TL/F/52556
Single Wire with Driver Ground ReferenceÐRS-423
TL/F/52557
http://www.national.com3
Physical Dimensions inches (millimeters)
Ceramic Dual-In-Line Package (J)
Order Number DS26LS32MJ, DS26LS33MJ, DS26LS32MJ/883 or DS26LS33MJ/883
NS Package Number J16A
Small Outline Package (M)
Order Number DS26LS32CM or DS26LS32ACM
NS Package Number M16A
http://www.national.com 4
Physical Dimensions inches (millimeters) (Continued)
Molded Dual-In-Line Package (N)
Order Number DS26LS32CN, DS26LS32ACN, DS26LS33CN or DS26LS33ACN
NS Package Number N16A
http://www.national.com5
DS26LS32C/DS26LS32M/DS26LS32AC/DS26LS33C/DS26LS33M/DS26LS33AC
Quad Differential Line Receivers
Physical Dimensions inches (millimeters) (Continued)
16 Lead Ceramic Flatpak (W)
Order Number DS26LS32MW/883 or DS26LS33MW/883
NS Package Number W16A
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with instructions for use provided in the labeling, can effectiveness.
be reasonably expected to result in a significant injury
to the user.
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