December 1990

2

Philips Semiconductors

Product specification

Octal D-type flip-flop; positive

edge-trigger; 3-state

74HC/HCT374

FEATURES

• 3-state non-inverting outputs for bus oriented

applications

• 8-bit positive, edge-triggered register

• Common 3-state output enable input

• Independent register and 3-state buffer operation

• Output capability: bus driver

GENERAL DESCRIPTION

The 74HC/HCT374 are high-speed Si-gate CMOS devices

and are pin compatible with low power Schottky TTL

(LSTTL). They are specified in compliance with JEDEC

standard no. 7A.

The 74HC/HCT374 are octal D-type flip-flops featuring

separate D-type inputs for each flip-flop and 3-state

outputs for bus oriented applications. A clock (CP) and an

output enable (OE) input are common to all flip-flops.

The 8 flip-flops will store the state of their individual

D-inputs that meet the set-up and hold times requirements

on the LOW-to-HIGH CP transition.

When OE is LOW, the contents of the 8 flip-flops are

available at the outputs. When OE is HIGH, the outputs go

to the high impedance OFF-state. Operation of the

OE input does not affect the state of the flip-flops.

The “374” is functionally identical to the “534”, but has

non-inverting outputs.

QUICK REFERENCE DATA

Notes

ORDERING INFORMATION

See

SYMBOL

PARAMETER

CONDITIONS

TYPICAL

UNIT

HC

HCT

15

13

ns

maximum clock frequency

77

48

MHz

input capacitance

3.5

3.5

pF

power dissipation capacitance per flip-flop

notes 1 and 2

17

17

pF