TLF10191

February 1992

DM74LS564

Octal D-Type Flip-Flop with TRI-STATE

Outputs

General Description

The ’LS564 is a high speed low power octal flip-flop with a

buffered common Clock (CP) and a buffered common Out-

put Enable (OE) The information presented to the D inputs

is stored in the flip-flops on the LOW-to-HIGH Clock (CP)

transition

This device is functionally identical to the ’LS574 but has

inverted outputs For complete discussions of operations

truth tables AC and DC electrical specifications refer to the

’LS374 data sheet

Features

Y

Inputs and outputs on opposite sides of package allow-

ing easy interface with microprocessors

Y

Useful as input or output port for microprocessors

Y

Functionally identical to ’LS574

Y

Input clamp diodes limit high speed termination effects

Y

Fully TTL and CMOS compatible

Connection Diagram

Dual-In-Line Package

TLF10191 – 1

Order Number DM74LS564WM or DM74LS564N

See NS Package Number M20B or N20A

Logic Symbol

TLF10191 – 2

Pin Names

Description

D0 – D7

Data Inputs

CP

Clock Pulse Input (Active Rising Edge)

OE

TRI-STATE Output Enable Input

(Active LOW)

O0–O7

TRI-STATE Outputs

TRI-STATE

is a registered trademark of National Semiconductor Corporation

C1995 National Semiconductor Corporation

RRD-B30M105Printed in U S A