TLF7553

February 1986

DS16149DS36149 DS16179DS36179 Hex MOS Drivers

General Description

The DS16149DS36149 and DS16179DS36179 are Hex

MOS drivers with outputs designed to drive large capacitive

loads up to 500 pF associated with MOS memory systems

PNP input transistors are employed to reduce input currents

allowing the large fan-out to these drivers needed in memo-

ry systems The circuit has Schottky-clamped transistor log-

ic for minimum propagation delay and a disable control that

places the outputs in the logic ‘‘1’’ state (see truth table)

This is especially useful in MOS RAM applications where a

set of address lines has to be in the logic ‘’1’’ state during

refresh

The DS16149DS36149 has a 15 X resistor in series with

the outputs to dampen transients caused by the fast-switch-

ing output The DS16179DS36179 has a direct low imped-

ance output for use with or without an external resistor

Features

Y

High speed capabilities

Y

Built-in 15 X damping resistor (DS16149DS36149)

Y

Same pin-out as DM8096 and DM74366

Schematic Diagram

TLF7553 – 1

C1995 National Semiconductor Corporation

RRD-B30M105Printed in U S A