DS9637ACMDC - National Semiconductor

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 EIAStandards 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 rec-

ommendations. The DS9637Ais 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

single 5V power supply and has Schottky TTL compatible

outputs. The DS9637A has an operational input common

mode range of ±7V either differentially or to ground.

Features

nDual channel

nSingle 5V supply

nSatisfies EIA standards RS-422 and RS423

nBuilt-in ±35 mV hysteresis

nHigh input common mode voltage range

nHigh input impedance

nTTL compatible outputs

nSchottky technology

nExtended temperature range

Connection Diagram

8–Lead DIP and SO-8 Package

DS009621-1

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

May 1998

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

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

Recommended Operating

Conditions

DS9637AM Min Max Units

Supply Voltage (V

) 4.5 5.5 V

Operating Temperature (T

) −55 +125 ˚C

DS9637AC

Supply Voltage (V

) 4.75 5.25 V

Operating Temperature (T

) 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

Differential Input −7.0V ≤V

≤+7.0V −0.2 +0.2 V

Threshold Voltage (Note 6)

TH(R)

Differential Input −7.0V ≤V

≤+7.0V −0.4 +0.4 V

Threshold Voltage (Note 7)

Input Current V

=10V, 0V ≤V

≤+5.5V 1.1 3.25 mA

(Note 8) V

=−10V, 0V ≤V

≤+5.5V −1.6 −3.25

Output Voltage LOW I

=20 mA, V

=Min 0.35 0.5 V

Output Voltage HIGH I

=−1.0 mA, V

=Min 2.5 3.5 V

Output Short Circuit V

=0V, V

=Max −40 −75 −100 mA

Current (Note 5)

Supply Current V

=Max, V

+=0.5V, 35 50 mA

−=GND

HYST

Input Hysteresis V

=±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+)−(V

−). VCM (Common Mode Input Voltage) =VI+orV

−.

Note 7: 500Ω±1%in series with inputs.

Note 8: The input not under test is tied to ground.

Switching Characteristics

=5.0V, T

=25˚C

Symbol Parameter Conditions Min Typ Max Units

PLH

Propagation Delay Time See AC Test Circuit 15 25 ns

Low to High

PHL

Propagation Delay Time See AC Test Circuit 13 25 ns

High to Low

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Switching Characteristics (Continued)

Typical Input/Output Transfer Characteristics

DS009621-2

FIGURE 1. Equivalent Circuit

DS009621-3 DS009621-4

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AC Test Circuit and Waveforms

Typical Applications

DS009621-5

Notes:

CLincludes jig and probe capacitance.

All diodes are FD700 or equivalent.

FIGURE 2.

DS009621-6

Amplitude: 1.0V

Offset: 0.5V

Pulse Width: 100 ns

PRR: 5.0 MHz

tr=tf≤5.0 ns

FIGURE 3.

DS009621-7

Notes:

RT≥50Ωfor RS-422 operation.

RTcombined with input impedance of receivers must be greater than 90Ω.

FIGURE 4. RS-422 System Application (FIPS 1020) Differential Simplex Bus Transmission

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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

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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 DE-

VICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMI-

CONDUCTOR CORPORATION. As used herein:

1. Life support devices or systems are devices or sys-

tems which, (a) are intended for surgical implant into

the body, or (b) support or sustain life, and whose fail-

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.

2. A critical component in any component of a life support

device or system whose failure to perform can be rea-

sonably expected to cause the failure of the life support

device or system, or to affect its safety or effectiveness.

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Molded Dual-In-Line Package (N)

Order Number DS9637ACN

NS Package Number N08E

DS9637A Dual Differential Line Receiver

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.