© 2000 Fairchild Semiconductor Corporation

DS006110

www.fairchildsemi.com

September 1986

Revised February 2000

DM74ALS574A

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 DM74ALS574A are edge-trig-

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

clock, the Q outputs will be set to 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 Functionally equivalent with DM74LS374

s Improved AC performance over DM74LS374 at approxi-

mately half the power

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

Ordering Code:

Devices 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

DM74ALS574AWM

M20B

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

DM74ALS574ASJ

M20D

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

DM74ALS574AN

N20A

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