© 2000 Fairchild Semiconductor Corporation

DS006212

www.fairchildsemi.com

September 1986

Revised February 2000

DM74ALS244A

Octal 3-STATE Bus Driver

General Description

This octal 3-STATE bus driver is designed to provide the

designer with flexibility in implementing a bus interface with

memory, microprocessor, or communication systems. This

device offers 64-extended temperature Grade product

guaranteeing performance from

−40°C to +85°C. The out-

put 3-STATE gating control is organized into two separate

groups of four buffers, and both control inputs enable the

respective outputs when set logic LOW. The 3-STATE cir-

cuitry contains a feature that maintains the buffer outputs in

3-STATE (high impedance state) during power supply

ramp-up or ramp-down. This eliminates bus glitching prob-

lems that arise during power-up and power-down.

Features

s Advanced

low

power

oxide-isolated

ion-implanted

Schottky TTL process

s Functional and pin compatible with the 74LS counterpart

s Improved switching performance with less power dissi-

pation compared with the 74LS counterpart

s Switching response specified into 500

Ω and 50 pF load

s Switching response specifications guaranteed over full

s PNP input design reduces input loading

Ordering Code:

Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

Connection Diagram

Function Table

H

= HIGH Level Logic State

L

= LOW Level Logic State

X

= Don't Care (Either LOW or HIGH Level Logic State)

Z

= High Impedance (OFF) State

Logic Diagram

Order Number

Package Number

Package Description

DM74ALS244AWM

M20B

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

DM74ALS244ASJ

M20D

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

DM74ALS244AMSA

MSA20

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

DM74ALS244AN

N20A

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

Input

Output

G

AY

LL

L

LH

H

HX

Z