DS78LS120J/883 NSC [National Semiconductor], DS78LS120J/883 Datasheet

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DS78LS120J/883

Manufacturer Part Number
DS78LS120J/883
Description
Dual Differential Line Receiver (Noise Filtering and Fail-Safe)
Manufacturer
NSC [National Semiconductor]
Datasheet

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© 2004 National Semiconductor Corporation
DS78LS120
Dual Differential Line Receiver (Noise Filtering and
Fail-Safe)
General Description
The DS78LS120 is a high performance, dual differential, TTL
compatible line receiver for both balanced and unbalanced
digital data transmission. The inputs are compatible with
EIA, Federal and MIL standards.
The line receiver will discriminate a
over a common-mode range of
over a range of
Circuit features include hysteresis and response control for
applications where controlled rise and fall times and/or high
frequency noise rejection are desirable. Threshold offset
control is provided for fail-safe detection, should the input be
open or short. Each receiver includes an optional 180Ω
terminating resistor and the output gate contains a logic
strobe for time discrimination. The DS78LS120 is specified
over a −55˚C to +125˚C temperature range.
Connection Diagram
±
15V.
±
10V and a
Order Number DS78LS120J/883 or DS78LS120W/883
±
200 mV input signal
DS007499
See NS Package Number J16A or W16A
±
300 mV signal
see RETS Data Sheet.
Dual-In-Line-Package
Top View
Input specifications meet or exceed those of the popular
DS7820 line receiver.
Features
n Meets EIA standards RS232-C, RS422 and RS423,
n Input voltage range of
n Separate strobe input for each receiver
n 5k typical input impedance
n Optional 180Ω termination resistor
n 50mV input hysteresis
n 200mV input threshold
n Separate fail-safe mode
Federal Standards 1020, 1030 and MIL-188-114
common-mode)
00749901
±
15V (differential or
September 1999
www.national.com

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DS78LS120J/883 Summary of contents

Page 1

... The DS78LS120 is specified over a −55˚C to +125˚C temperature range. Connection Diagram Order Number DS78LS120J/883 or DS78LS120W/883 © 2004 National Semiconductor Corporation Input specifications meet or exceed those of the popular DS7820 line receiver. ...

Page 2

Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Input Voltage Strobe Voltage Output Sink Current Storage Temperature Range Maximum Power Dissipation at 25˚C (Note 1) ...

Page 3

Switching Characteristics 25˚ Symbol Parameter t Differential Input to “0” Output pd0(D) t Differential Input to “1” Output pd1(D) t Strobe Input to “0” Output pd0(S) t Strobe Input to “1” Output pd1(S) ...

Page 4

Application Hints (Continued) 00749907 Logic Level Translator The DS78LS120 may be used as a level translator to inter- ± face between 12V MOS, ECL, TTL and CMOS. To config- ure, bias either input to a voltage equal to the input ...

Page 5

Application Hints (Continued) FIGURE 2. TRANSMISSION LINE TERMINATION On a transmission line which is electrically long advis- able to terminate the line in its characteristic impedance to prevent signal reflection and its associated noise/cross-talk. A 180Ω termination resistor ...

Page 6

Application Hints (Continued) For balanced operation with inputs open or shorted, receiver C will indeterminate logic state. Receivers A and B will logic zero state allowing the NOR gate to detect the open or ...

Page 7

Truth Table (For Balanced Fail-Safe) Input Strobe Schematic Diagram A-Out B-Out C-Out D-Out 0 0 ...

Page 8

... Physical Dimensions www.national.com inches (millimeters) unless otherwise noted Ceramic Dual-In-Line Package (J) Order Number DS78LS120J/883 NS Package Number J16A Ceramic Dual-In-Line Package (W) Order Number DS78LS120W/883 NS Package Number W16A 8 ...

Page 9

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. For the most current product information ...

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