DS9637ACM - National Semiconductor

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

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°

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

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

For more National Semiconductor product information and proven design tools, visit the following Web sites at:

Products Design Support

Amplifiers www.national.com/amplifiers WEBENCH www.national.com/webench

Audio www.national.com/audio Analog University www.national.com/AU

Clock Conditioners www.national.com/timing App Notes www.national.com/appnotes

Data Converters www.national.com/adc Distributors www.national.com/contacts

Displays www.national.com/displays Green Compliance www.national.com/quality/green

Ethernet www.national.com/ethernet Packaging www.national.com/packaging

Interface www.national.com/interface Quality and Reliability www.national.com/quality

LVDS www.national.com/lvds Reference Designs www.national.com/refdesigns

Power Management www.national.com/power Feedback www.national.com/feedback

Switching Regulators www.national.com/switchers

LDOs www.national.com/ldo

LED Lighting www.national.com/led

PowerWise www.national.com/powerwise

Serial Digital Interface (SDI) www.national.com/sdi

Temperature Sensors www.national.com/tempsensors

Wireless (PLL/VCO) www.national.com/wireless

THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION

(“NATIONAL”) PRODUCTS. NATIONAL MAKES NO REPRESENTATIONS OR WARRANTIES WITH RESPECT TO THE ACCURACY

OR COMPLETENESS OF THE CONTENTS OF THIS PUBLICATION AND RESERVES THE RIGHT TO MAKE CHANGES TO

SPECIFICATIONS AND PRODUCT DESCRIPTIONS AT ANY TIME WITHOUT NOTICE. NO LICENSE, WHETHER EXPRESS,

IMPLIED, ARISING BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS

DOCUMENT.

TESTING AND OTHER QUALITY CONTROLS ARE USED TO THE EXTENT NATIONAL DEEMS NECESSARY TO SUPPORT

NATIONAL’S PRODUCT WARRANTY. EXCEPT WHERE MANDATED BY GOVERNMENT REQUIREMENTS, TESTING OF ALL

PARAMETERS OF EACH PRODUCT IS NOT NECESSARILY PERFORMED. NATIONAL ASSUMES NO LIABILITY FOR

APPLICATIONS ASSISTANCE OR BUYER PRODUCT DESIGN. BUYERS ARE RESPONSIBLE FOR THEIR PRODUCTS AND

APPLICATIONS USING NATIONAL COMPONENTS. PRIOR TO USING OR DISTRIBUTING ANY PRODUCTS THAT INCLUDE

NATIONAL COMPONENTS, BUYERS SHOULD PROVIDE ADEQUATE DESIGN, TESTING AND OPERATING SAFEGUARDS.

EXCEPT AS PROVIDED IN NATIONAL’S TERMS AND CONDITIONS OF SALE FOR SUCH PRODUCTS, NATIONAL ASSUMES NO

LIABILITY WHATSOEVER, AND NATIONAL DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY RELATING TO THE SALE

AND/OR USE OF NATIONAL PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR

PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY

RIGHT.

LIFE SUPPORT POLICY

NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR

SYSTEMS WITHOUT THE EXPRESS PRIOR WRITTEN APPROVAL OF THE CHIEF EXECUTIVE OFFICER AND GENERAL

COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:

Life support devices or systems are devices 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. A critical component is any component in 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.

National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other

brand or product names may be trademarks or registered trademarks of their respective holders.

For the most current product information visit us at www.national.com

National Semiconductor

Americas Customer

Support Center

Email:

new.feedback@nsc.com

Tel: 1-800-272-9959

National Semiconductor Europe

Customer Support Center

Fax: +49 (0) 180-530-85-86

Email: europe.support@nsc.com

Deutsch Tel: +49 (0) 69 9508 6208

English Tel: +49 (0) 870 24 0 2171

Français Tel: +33 (0) 1 41 91 8790

National Semiconductor Asia

Pacific Customer Support Center

Email: ap.support@nsc.com

National Semiconductor Japan

Customer Support Center

Fax: 81-3-5639-7507

Email: jpn.feedback@nsc.com

Tel: 81-3-5639-7560