© 2004 Fairchild Semiconductor Corporation

DS006228

www.fairchildsemi.com

October 1986

Revised July 2004

DM74ALS576A

Octal D-Type Edge-Triggered Flip-Flop

with 3-STATE Outputs

General Description

These 8-bit registers feature totem-pole 3-STATE outputs

designed specifically for driving highly-capacitive or rela-

tively low-impedance loads. The high-impedance state and

increased 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, I/O ports, bidirectional

bus drivers, and working registers.

The eight flip-flops of the DM74ALS576A are edge-trig-

gered inverting D-type flip-flops. On the positive transition

of the clock, the Q outputs will be set to the complement of

the logic states that were set up at the D inputs.

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-imped-

ance state the outputs neither load nor drive the bus lines

significantly.

The output control does not affect the internal operation of

the flip-flops. That is, the old data can be retained or new

data can be entered even while the outputs are OFF.

Features

s Switching specifications at 50 pF

s Switching specifications guaranteed over full tempera-

s Advanced oxide-isolated, ion-implanted Schottky TTL

process

s 3-STATE buffer-type outputs drive bus lines directly

Ordering Code:

Note 1: Device also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

Connection Diagram

Order Number

Package Number

Package Description

DM74ALS576AWM

(Note 1)

M20B

20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide

DM74ALS576SJX

M20D

20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

DM74ALS576AN

N20A

20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide