TLF6311

December 1989

DM74AS533 Octal D-Type Transparent

Latch with TRI-STATE

Outputs

General Description

These 8-bit registers feature totem-pole TRI-STATE outputs

designed specifically for driving highly-capacitive or relative-

ly low-impedance loads The high-impedance state and in-

creased high-logic-level drive provide these registers with

the capability of being connected directly to and driving the

bus lines in a bus-organized system without need for inter-

face or pull-up components They are particularly attractive

for implementing buffer registers IO ports bidirectional

bus drivers and working registers

The eight inverting latches of the AS533 are transparent D-

type latches meaning that while the enable (G) is high the Q

outputs will follow the complement of the data (D) inputs

When the enable is taken low the output will be latched at

the complement of the level of the data that was set up

A buffered output control input can be used to place the

eight outputs in either a normal logic state (high or low logic

levels) or a high-impedance state In the high-impedance

state the outputs neither load nor drive the bus lines signifi-

cantly

The output control does not affect the internal operation of

the latches That is the old data can be retained or new

data can be entered even while the outputs are off

Features

Y

Switching specifications at 50 pF

Y

Switching specifications guaranteed over full tempera-

Y

Advanced oxide-isolated

ion-implanted Schottky TTL

process

Y

TRI-STATE buffer-type outputs drive bus lines directly

Connection Diagram

Dual-In-Line Package

TLF6311 – 1

Order Number DM74AS533WM or DM74AS533N

See NS Package Number M20B or N20A

TRI-STATE

is a registered trademark of National Semiconductor Corporation

C1995 National Semiconductor Corporation

RRD-B30M105Printed in U S A