© 1999 Fairchild Semiconductor Corporation

DS009528

www.fairchildsemi.com

May 1988

Revised August 1999

74F381

4-Bit Arithmetic Logic Unit

General Description

The 74F381 performs three arithmetic and three logic oper-

ations on two 4-bit words, A and B. Two additional select

input codes force the function outputs LOW or HIGH. Carry

propagate and generate outputs are provided for use with

the 74F182 carry lookahead generator for high-speed

expansion to longer word lengths. For ripple expansion,

refer to the 74F382 ALU data sheet.

Features

s Low input loading minimizes drive requirements

s Performs six arithmetic and logic functions

s Selectable LOW (clear) and HIGH (preset) functions

s Carry generate and propagate outputs for use with carry

lookahead generator

Ordering Code:

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

Logic Symbols

IEEE/IEC

Connection Diagram

Order Number

Package Number

Package Description

74F381SC

M20B

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

74F381SJ

M20D

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

74F381PC

N20A

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