TLF5906

March 1988

MM54C373MM74C373 TRI-STATE

Octal D-Type Latch

MM54C374MM74C374 TRI-STATE Octal D-Type Flip-Flop

General Description

The MM54C373MM74C373 MM54C374MM74C374 are

integrated complementary MOS (CMOS) 8-bit storage ele-

ments with TRI-STATE outputs These outputs have been

specially designed to drive high capacitive loads such as

one might find when driving a bus and to have a fan out of 1

when driving standard TTL When a high logic level is ap-

plied to the OUTPUT DISABLE 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 MM54C373MM74C373 is an 8-bit latch When LATCH

ENABLE is high the Q outputs will follow the D inputs

When LATCH ENABLE goes low data at the D inputs

which meets the set-up and hold time requirements will be

retained at the outputs until LATCH ENABLE returns high

again

The MM54C374MM74C374 is an 8-bit D-type positive-

edge triggered flip-flop Data at the D inputs meeting the

set-up and hold time requirements is transferred to the Q

outputs on positive-going transitions of the CLOCK input

Both the MM54C373MM74C373 and the MM54C374

MM74C374 are being assembled in 20-pin dual-in-line pack-

ages with 0300

pin centers

Features

Y

Wide supply voltage range

3V to 15V

Y

High noise immunity

Y

Low power consumption

Y

TTL compatibility

Fan out of 1

driving standard TTL

Y

Bus driving capability

Y

TRI-STATE outputs

Y

Eight storage elements in one package

Y

Single CLOCKLATCH ENABLE and OUTPUT

DISABLE control inputs

Y

20-pin dual-in-line package with 0300

centers takes

half the board space of a 24-pin package

Connection Diagrams

MM54C373MM74C373

Dual-In-Line Package

TLF5906 – 1

Top View

Order Number MM54C373 or MM74C373

MM54C374MM74C374

Dual-In-Line Package

TLF5906 – 2

Top View

Order Number MM54C374 or MM74C374

TRI-STATE

is a registered trademark of National Semiconductor Corporation

C1995 National Semiconductor Corporation

RRD-B30M105Printed in U S A