74F191

74F191 Up/Down Binary Counter with Preset and Ripple Clock

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74F191 Up/Down Binary Counter with Preset and Ripple Clock

April 2007

74F191 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 presetting. 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 initiated 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