tm

September

2007

©1986 Fairchild Semiconductor Corporation

www.fairchildsemi.com

DM74ALS240A, DM74ALS241A Rev. 1.3

DM74ALS240A, DM74ALS241A

Octal 3-STATE Bus Driver

Features

Schottky TTL process

counterpart

dissipation compared with the DM74LS counterpart

Ω and 50pF

load

= 24mA

General Description

These octal 3-STATE bus drivers are designed to

provide the designer with flexibility in implementing a bus

interface with memory, microprocessor, or communi-

cation systems. The output 3-STATE gating control is

organized into two separate groups of four buffers.

The DM74ALS240A control inputs symmetrically enable

the respective outputs when set logic LOW, while the

DM74ALS241A has complementary enable gating.

The 3-STATE circuitry contains a feature that maintains

the buffer outputs in 3-STATE (high impedance state)

during power supply ramp-up or ramp-down. This elimi-

nates bus glitching problems that arise during power-up

and power-down.

Ordering Information

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

Connection Diagram

DM74ALS240A

DM74ALS241A

Order Number

Package

Number

Package Description

DM74ALS240AWM

M20B

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

DM74ALS240ASJ

M20D

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

DM74ALS240AN

N20A

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

DM74ALS241AWM

M20B

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