TLF7506

February 1986

DS1648DS3648DS1678DS3678 TRI-STATE

TTL to

MOS MultiplexersDrivers

General Description

The DS1648DS3648 and DS1678DS3678 are quad 2-in-

put multiplexers with TRI-STATE outputs designed to drive

the large capacitive loads (up to 500 pF) associated with

MOS memory systems A PNP input structure is employed

to minimize input currents so that driver loading in large

memory systems is reduced The circuit employs Schottky-

clamped transistors for high speed and TRI-STATE outputs

for bus operation

The DS1648DS3648 has a 15X resistor in series with the

outputs to dampen transients caused by the fast-switching

output The DS1678DS3678 has a direct low impedance

output for use with or without an external resistor

Features

Y

TRI-STATE outputs interface directly with system-bus

Y

Schottky-clamped for better ac performance

Y

PNP inputs to minimize input loading

Y

TTL compatible

Y

High-speed capacitive load drivers

Y

Built-in damping resistor (DS1648DS3648 only)

Logic and Connection Diagrams

TLF7506 1

Dual-In-Line Package

TLF7506 2

Top View

Order Number DS1648J DS3648J DS1678J

DS3678J DS3648N or DS3678N

See NS Package Number J16A or N16A

TRI STATE

is a registered trademark of National Semiconductor Corp

C1995 National Semiconductor Corporation

RRD B30M105Printed in U S A