DS26LS32AC/DS26LS32C/DS26LS32M/DS26LS33M
Quad Differential Line Receivers
General Description
The DS26LS32 and DS26LS32Aare quad differential line re-
ceivers designed to meet the RS-422, RS-423 and Federal
Standards 1020 and 1030 for balanced and unbalanced digi-
tal data transmission.
The DS26LS32 and DS26LS32A have an input sensitivity of
200 mV over the input voltage range of ±7V and the
DS26LS33 have an input sensitivity of 500 mV over the input
voltage range of ±15V.
The DS26LS32A differ in function from the popular
DS26LS32 and DS26LS33 in that input pull-up and
pull-down resistors are included which prevent output oscil-
lation on unused channels.
Each version provides an enable and disable function com-
mon to all four receivers and features TRI-STATE ®outputs
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
nHigh differential or common-mode input voltage ranges
of ±7V on the DS26LS32 and DS26LS32A and ±15V
on the DS26LS33
n±0.2V sensitivity over the input voltage range on the
DS26LS32 and DS26LS32A, ±0.5V sensitivity on the
DS26LS33
nDS26LS32 and DS26LS32A meet all requirements of
RS-422 and RS-423
n6k minimum input impedance
n100 mV input hysteresis on the DS26LS32 and
DS26LS32A, 200 mV on the DS26LS33
nOperation from a single 5V supply
nTRI-STATE outputs, with choice of complementary
output enables for receiving directly onto a data bus
Logic Diagram
TRI-STATE®is a registered trademark of National Semiconductor Corporation.
DS005255-1
May 1999
DS26LS32AC/DS26LS32C/DS26LS32M/DS26LS33MQuad Differential Line Receivers
© 1999 National Semiconductor Corporation DS005255 www.national.com
Connection Diagram
Truth Table
ENABLE ENABLE Input Output
0 1 X Hi-Z
See V
ID
≥V
TH
(Max) 1
Note Below V
ID
≤V
TH
(Min) 0
Hi-Z = TRI-STATE®
Note: Input conditions may be any combination not defined for ENABLE and ENABLE .
Dual-In-Line Package
DS005255-2
Top View
Order Number DS26LS32CM, DS26LS32CN,
DS26LS32ACM, DS26LS32ACN, DS26LS33ACM
or DS26LS33ACN
See NS Package Number M16A or N16E
For Complete Military Product Specifications,
refer to the appropriate SMD or MDS.
Order Number DS26LS32MJ/883, DS26LS32MW/883,
DS26LS32ME/883, DS26LS33MW/883
See NS Package Number E20A, J16A or W16A
20-Lead Ceramic Leadless Chip Carrier
DS005255-12
www.national.com 2
Absolute Maximum Ratings (Note 3)
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 ±25V
Differential Input Voltage ±25V
Enable Voltage 7V
Output Sink Current 50 mA
Maximum Power Dissipation (Note 1) at 25˚C
Cavity Package 1433 mW
Molded Dip Package 1362 mW
SO Package DS26LS32 1002 mW
DS26LS32A 1051 mW
Storage Temperature Range −65˚C to
+165˚C
Lead Temperature (Soldering, 4 seconds) 260˚C
Operating Conditions
Min Max Units
Supply Voltage, (V
CC
)
DS26LS32M, DS26LS33M 4.5 5.5 V
(MIL)
DS26LS32C 4.75 5.25 V
DS26LS32AC
(COML)
Temperature, (T
A
)
DS26LS32M, DS26LS33M −55 +125 ˚C
(MIL)
DS26LS32C 0 +70 ˚C
DS26LS32AC
(COML)
Note 1: Derate cavity package 9.6 mW/˚C above 25˚C; derate molded DIP
package 10.9 mW/˚C above 25˚C.
Note 2: Derate SO Package 8.01 mW/˚C for DS26LS32
8.41 mW/˚C for DS26LS32A
Electrical Characteristics (Notes 4, 5, 6)
over the operating temperature range unless otherwise specified
Symbol Parameter Conditions Min Typ Max Units
V
TH
Differential Input V
OUT
=V
OH
DS26LS32, DS26LS32A, −7V ≤V
CM
≤+7V −0.2 ±0.07 0.2 V
Voltage or V
OL
DS26LS33, DS26LS33A, −15V ≤V
CM
+15V −0.5 ±0.14 0.5 V
R
IN
Input Resistance −15V ≤V
CM
≤+15V (One Input AC GND) 6.0 8.5 kΩ
I
IN
Input Current (Under V
IN
=15V, Other Input −15V ≤V
IN
≤+15V 2.3 mA
Test) V
IN
=−15V, Other Input −15V ≤V
IN
≤+15V −2.8 mA
V
OH
Output High Voltage V
CC
=MIN, ∆V
IN
=1V, Commercial 2.7 4.2 V
V
ENABLE
=0.8V, I
OH
=−440 µA Military 2.5 4.2 V
V
OL
Output Low Voltage V
CC
=Min, ∆V
IN
=−1V, I
OL
=4 mA 0.4 V
V
ENABLE
=0.8V I
OL
=8 mA 0.45 V
V
IL
Enable Low Voltage 0.8 V
V
IH
Enable High Voltage 2.0 V
V
I
Enable Clamp V
CC
=Min, I
IN
=−18 mA −1.5 V
Voltage
I
O
OFF-State (High V
CC
=Max V
O
=2.4V 20 µA
Impedance) Output V
O
=0.4V −20 µA
Current
I
IL
Enable Low Current V
IN
=0.4V −0.36 mA
I
IH
Enable High Current V
IN
=2.7V 20 µA
I
SC
Output Short-Circuit V
O
=0V, V
CC
=Max, ∆V
IN
=1V −15 −85 mA
Current
I
CC
Power Supply V
CC
=Max, All V
IN
=GND, DS26LS32, DS26LS32A 52 70 mA
Current Outputs Disabled DS26LS33, DS26LS33A 57 80 mA
I
I
Input High Current V
IN
=5.5V 100 µA
V
HYST
Input Hysteresis T
A
=25˚C, V
CC
=5V, DS26LS32, DS26S32A 100 mV
V
CM
=0V DS26LS33, DS26LS33A 200 mV
Note 3: “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 4: 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 oth-
erwise specified. All values shown as max or min are so classified on absolute value basis.
Note 5: All typical values are VCC =5V, TA=25˚C.
Note 6: Only one output at a time should be shorted.
www.national.com3
Switching Characteristics
V
CC
=5V, T
A
=25˚C
Symbol Parameter Conditions DS26LS32/DS26LS33 DS26LS32A/DS26LS33A Units
Min Typ Max Min Typ Max
t
PLH
Input to Output C
L
=15 pF 17 25 23 35 ns
t
PHL
17 25 23 35 ns
t
LZ
ENABLE to Output C
L
=5pF 2030 1530ns
t
HZ
15 22 20 25 ns
t
ZL
ENABLE to Output C
L
=15 pF 15 22 14 22 ns
t
ZH
15 22 15 22 ns
AC Test Circuit and Switching Time Waveforms
Typical Applications
Load Test Circuit for TRI-STATE®Outputs
DS005255-3
Propagation Delay (Notes 7, 9)
DS005255-4
Enable and Disable Times (Notes 8, 9)
DS005255-5
Note 7: Diagram shown for ENABLE low.
Note 8: S1 and S2 of load circuit are closed except where shown.
Note 9: Pulse generator for all pulses: Rate =1.0 MHz; ZO=50Ω;t
r≤6 ns; tf≤6.0 ns.
Two-Wire Balanced Interface—RS-422
DS005255-6
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Typical Applications (Continued)
Single Wire with Driver Ground Reference—RS-423
DS005255-7
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Physical Dimensions inches (millimeters) unless otherwise noted
Ceramic Dual-In-Line Package (J)
Order Number DS26LS32MJ/883 or DS26LS33MJ/883
NS Package Number J16A
Small Outline Package (M)
Order Number DS26LS32CM or DS26LS32ACM
NS Package Number M16A
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
Molded Dual-In-Line Package (N)
Order Number DS26LS32CN or DS26LS32ACN
NS Package Number N16E
16 Lead Ceramic Flatpak (W)
Order Number DS26LS32MW/883 or DS26LS33MW/883
NS Package Number W16A
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
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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 AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure 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.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
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www.national.com
20 Lead Ceramic Leadless Chip Carrier (E)
Order Number DS26LS32ME/883
NS Package Number E20A
DS26LS32AC/DS26LS32C/DS26LS32M/DS26LS33MQuad Differential Line Receivers
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.
