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74F191 - Up/Down Binary Counter

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.

Key Features

  • s High-Speed.
  • 125 MHz typical count frequency s Synchronous counting s Asynchronous parallel load s Cascadable Ordering Code: Order Number 74F191SC 74F191SJ 74F191PC Package Number M16A M16D N16E Package.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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74F191 Up/Down Binary Counter with Preset 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 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.