74F191_07 Datasheet, PDF (1/12 Pages) Fairchild Semiconductor – Up/Down Binary Counter with Preset and Ripple Clock

April 2007
74F191
tm
Up/Down Binary Counter with Preset and Ripple Clock
Features
■ High-Speed—125MHz typical count frequency
■ Synchronous counting
■ Asynchronous parallel load
■ Cascadable
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
Order
Number
74F191SC
74F191SJ
74F191PC
Package
Number
M16A
M16D
N16E
Package Description
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering number.
Logic Symbols
Connection Diagram
IEEE/IEC
©1988 Fairchild Semiconductor Corporation
74F191 Rev. 1.0.2
www.fairchildsemi.com