74F191 Datasheet, PDF (1/7 Pages) NXP Semiconductors – Up/down binary counter with reset and ripple clock

April 1988
Revised July 1999
74F191
Up/Down Binary Counter with Preset and Ripple Clock
General Description
The 74F191 is a reversible modulo-16 binary counter fea-
turing synchronous counting and asynchronous presetting.
The preset feature allows the 74F191 to be used in pro-
grammable 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 initiated by the ris-
ing edge of the clock.
Features
s High-Speed—125 MHz typical count frequency
s Synchronous counting
s Asynchronous parallel load
s Cascadable
Ordering Code:
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
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbols
Connection Diagram
IEEE/IEC
© 1999 Fairchild Semiconductor Corporation DS009495
www.fairchildsemi.com