TLF5805

February 1996

DS7640DS8640 Quad NOR Unified Bus Receiver

General Description

The DS7640 and DS8640 are quad 2-input receivers de-

signed for use in bus organized data transmission systems

interconnected by terminated 120X impedance lines The

external termination is intended to be 180X resistor from

tor from the bus to ground The design employs a built-in

input threshold providing substantial noise immunity Low

input current allows up to 27 driverreceiver pairs to utilize a

common bus

Features

Y

(30 mA typ)

Y

High noise immunity (11V typ)

Y

Temperature-insensitive input thresholds track bus logic

levels

Y

TTL compatible output

Y

Matched optimized noise immunity for ‘‘1’’ and ‘‘0’’

levels

Y

High speed (19 ns typ)

Connection Diagram

Dual-In-Line Package

TLF5805 – 1

Top View

Order Number DS7640J or DS8640N

See NS Package Number J14A or N14A

Typical Application

120X Unified Data Bus

TLF5805 – 2

C1996 National Semiconductor Corporation

RRD-B30M36Printed in U S A

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