TLF10627

PRELIMINARY

February 1990

MM54HCT573MM74HCT573

TRI-STATE

Octal D-Type Latch

MM54HCT574MM74HCT574

TRI-STATE Octal D-Type Flip-Flop

General Description

The MM54HCT573MM74HCT573 octal D-type latches and

MM54HCT574MM74HCT574 Octal D-type flip flops ad-

vanced silicon-gate CMOS technology which provides the

inherent benefits of low power consumption and wide power

supply range but are LS-TTL input and output characteristic

pin-out compatible The TRI-STATE outputs are capable

of driving 15 LS-TTL loads All inputs are protected from

and ground

When the MM54HCT573MM74HCT573 LATCH ENABLE

input is high the Q outputs will follow the D inputs When

the LATCH ENABLE goes low data at the D inputs will be

retained at the outputs until LATCH ENABLE returns high

again When a high logic level is applied to the OUTPUT

CONTROL input all outputs go to a high impedance state

regardless of what signals are present at the other inputs

and the state of the storage elements

The MM54HCT574MM74HCT574 are positive edge trig-

gered flip-flops Data at the D inputs meeting the setup and

hold time requirements are transferred to the Q outputs on

positive going transitions of the CLOCK (CK) input When a

high logic level is applied to the OUTPUT CONTROL (OC)

input all outputs go to a high impedance state regardless

of what signals are present at the other inputs and the state

of the storage elements

MM54HCTMM74HCT devices are intended to interface be-

tween TTL and NMOS components and standard CMOS

devices These parts are also plug in replacements for LS-

TTL devices and can be used to reduce power consumption

in existing designs

Features

Y

TTL input characteristic compatible

Y

Typical propagation delay 18 ns

Y

Low input current 1 mA maximum

Y

Low quiescent current 80 mA maximum

Y

Compatible with bus-oriented systems

Y

Output drive capability 15 LS-TTL loads

Connection Diagram

Dual-In-Line Package

TLF10627 – 1

Top View

Order Number MM54HCT573 or MM74HCT573

TLF10627 – 2

Top View

Order Number MM54HCT574 or MM74HCT574

Please look into Section 8 Appendix D for availability of various package types

TRI-STATE

is a registered trademark of National Semiconductor Corporation

C1995 National Semiconductor Corporation

RRD-B30M105Printed in U S A