TLF7515

March 1986

DS1649DS3649DS1679DS3679 Hex TRI-STATE

TTL

to MOS Drivers

General Description

The DS1649DS3649 and DS1679DS3679 are Hex

TRI-STATE 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 re-

duce input currents allowing the large fan-out to these driv-

ers needed in memory systems The circuit has Schottky-

clamped transistor logic for minimum propagation delay

and TRI-STATE outputs for bus operation

The DS1649DS3649 has a 15X resistor in series with the

outputs to dampen transients caused by the fast-switching

TRI-STATE

is a registered trademark of National Semiconductor Corp

output The DS1679DS3679 has a direct low impedance

output for use with or without an external resistor

Features

Y

High speed capabilities

Y

TRI-STATE outputs for data bussing

Y

Built-in 15X damping resistor (DS1649DS3649)

Y

Same pin-out as DM8096 and DM74366

Schematic Diagram

DS1649DS3649 only

TLF7515 – 1

Truth Table

Disable Input

Input Output

DIS 1

DIS 2

00

0

1

00

1

0

0

1

X

Hi-Z

1

0

X

Hi-Z

1

1

X

Hi-Z

Connection Diagram

Dual-In-Line Package

TLF7515 – 2

Top View

Order Number DS1649J DS3649J

DS1679J DS3679J DS3649N or DS3679N

See NS Package Number J16A or N16A

Typical Application

TLF7515 – 3

C1995 National Semiconductor Corporation

RRD-B30M105Printed in U S A