DS9637A
DS9637A Dual Differential Line Receiver
Literature Number: SNLS388C
December 6, 2007
DS9637A
Dual Differential Line Receiver
General Description
The DS9637A is a Schottky dual differential line receiver
which has been specifically designed to satisfy the require-
ments of EIA Standards RS-422 and RS-423. In addition, the
DS9637A satisfies the requirements of MIL-STD 188-114 and
is compatible with the International Standard CCITT recom-
mendations. The DS9637A is suitable for use as a line re-
ceiver in digital data systems, using either single ended or
differential, unipolar or bipolar transmission. It requires a sin-
gle 5V power supply and has Schottky TTL compatible out-
puts. The DS9637A has an operational input common mode
range of ±7V either differentially or to ground.
Features
Dual channel
Single 5V supply
Satisfies EIA standards RS-422 and RS423
Built-in ±35 mV hysteresis
High input common mode voltage range
High input impedance
TTL compatible outputs
Schottky technology
Extended temperature range
Connection Diagram
8–Lead DIP and SO-8 Package
962101
Top View
Order Number DS9637ACM or DS9637ACN
See NS Package Number M08A or N08E
For Complete Military Product Specifications,
refer to the appropriate SMD or MDS.
Order Number DS9637AMJ/883
See NS Package Number J08A
© 2007 National Semiconductor Corporation 9621 www.national.com
DS9637A Dual Differential Line Receiver
Absolute Maximum Ratings (Note 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Storage Temperature Range
Ceramic DIP −65°C to + 175°C
Molded DIP −65°C to + 150°C
Lead Temperature
Ceramic DIP
(Soldering, 30 seconds) 300°C
Molded DIP and SO Package
(Soldering, 10 seconds) 265°C
Maximum Power Dissipation (Note 1) at 25°C
Cavity Package 1300 mW
Molded Package 930 mW
SO Package 810 mW
VCC Lead Potential to Ground −0.5V to 7.0V
Input Potential to Ground ±15V
Differential Input Voltage ±15V
Output Potential to Ground −0.5V to +5.5V
Output Sink Current 50 mA
ESD Susceptibility, HBM 2 kV
Recommended Operating
Conditions
DS9637AM Min Max Units
Supply Voltage (VCC) 4.5 5.5 V
Operating Temperature (TA) −55 +125 °C
DS9637AC
Supply Voltage (VCC) 4.75 5.25 V
Operating Temperature (TA) 0 +70 °C
Note 1: Derate cavity package 8.7 mW/°C above 25°C; derate molded DIP
package 7.5 mW/°C above 25°C; derate SO package 6.5 mW/°C above 25°
C.
Electrical Characteristics (Notes 3, 4)
Over recommended operating temperature and supply voltage ranges, unless otherwise specified
Symbol Parameter Conditions Min Typ Max Units
VTH Differential Input −7.0V VCM +7.0V −0.2 +0.2 V
Threshold Voltage (Note 6)
VTH(R) Differential Input −7.0V VCM +7.0V −0.4 +0.4 V
Threshold Voltage (Note 7)
IIInput Current VI = 10V, 0V VCC +5.5V 1.1 3.25 mA
(Note 8) VI = −10V, 0V VCC +5.5V −1.6 −3.25
VOL Output Voltage LOW IOL = 20 mA, VCC = Min 0.35 0.5 V
VOH Output Voltage HIGH IOH = −1.0 mA, VCC = Min 2.5 3.5 V
IOS Output Short Circuit VO = 0V, VCC = Max −40 −75 −100 mA
Current (Note 5)
ICC Supply Current VCC = Max, VI+ = 0.5V, 35 50 mA
VI− = GND
VHYST Input Hysteresis VCM = ±7.0V (See Curves) 70 mV
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 DS9637AM and across the 0°C to +70°C range for
the DS9637ASC. All typicals are given for VCC = 5V and TA = 25°C.
Note 4: All currents into the device pins are positive; all currents out of the device pins are negative. All voltages are referenced to ground unless otherwise
specified.
Note 5: Only one output at a time should be shorted.
Note 6: VDIFF (Differential Input Voltage) = (VI+) − (VI−). VCM (Common Mode Input Voltage) = VI+ or VI−.
Note 7: 500Ω ±1% in series with inputs.
Note 8: The input not under test is tied to ground.
Switching Characteristics
VCC = 5.0V, TA = 25°C
Symbol Parameter Conditions Min Typ Max Units
tPLH Propagation Delay Time See AC Test Circuit 15 25 ns
Low to High
tPHL Propagation Delay Time See AC Test Circuit 13 25 ns
High to Low
www.national.com 2
DS9637A
962102
FIGURE 1. Equivalent Circuit
Typical Input/Output Transfer Characteristics
962103 962104
3 www.national.com
DS9637A
AC Test Circuit and Waveforms
962105
Notes:
CL includes jig and probe capacitance.
All diodes are FD700 or equivalent.
FIGURE 2.
962106
VI
Amplitude: 1.0V
Offset: 0.5V
Pulse Width: 100 ns
PRR: 5.0 MHz
tr = tf 5.0 ns
FIGURE 3.
www.national.com 4
DS9637A
Typical Applications
962107
Notes:
RT 50Ω for RS-422 operation.
RT combined with input impedance of receivers must be greater than 90Ω.
FIGURE 4. RS-422 System Application (FIPS 1020) Differential Simplex Bus Transmission
5 www.national.com
DS9637A
Physical Dimensions inches (millimeters) unless otherwise noted
Ceramic Dual-In-Line Package (J)
Order Number DS9637AMJ/883
NS Package Number J08A
Molded Surface Mount Package (M)
Order Number DS9637ACM
NS Package Number M08A
www.national.com 6
DS9637A
Molded Dual-In-Line Package (N)
Order Number DS9637ACN
NS Package Number N08E
7 www.national.com
DS9637A
Notes
DS9637A Dual Differential Line Receiver
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