tm

April 2007

©1988 Fairchild Semiconductor Corporation

www.fairchildsemi.com

74F191 Rev. 1.0.2

74F191

Up/Down Binary Counter with Preset and Ripple Clock

Features

General Description

The 74F191 is a reversible modulo-16 binary counter

featuring synchronous counting and asynchronous pre-

setting. The preset feature allows the 74F191 to be used

in programmable dividers. The Count Enable input, the

Terminal Count output and Ripple Clock output make

possible a variety of methods of implementing multistage

counters. In the counting modes, state changes are initi-

ated by the rising edge of the clock.

Ordering Information

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

Logic Symbols

Connection Diagram

Order

Number

Package

Number

Package Description

74F191SC

M16A

16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow

74F191SJ

M16D

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

74F191PC

N16E

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

IEEE/IEC