74AC191SCX Datasheet PDF – Up/Down Counter

Part Number: 74AC191SCX

Function: Up/Down Counter with Preset and Ripple Clock

Package: SOIC 16 Pin type

Manufacturer: Fairchild Semiconductor


74AC191SCX datasheet



The 74AC191SCX, 74AC191, 74191 is a reversible modulo 16 binary counter. It features synchronous counting and asynchronous presetting. The preset feature allows the AC191 to be used in programmable dividers. The Count Enable input, the Terminal Count output and the 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.


1. ICC reduced by 50%
2. High speed—133 MHz typical count frequency
3. Synchronous counting
4. Asynchronous parallel load
5. Cascadable
6. Outputs source/sink 24 mA

Other data sheets are available within the file:

74AC191CW, 74AC191MTC, 74AC191MTCX, 74AC191PC, 74AC191SC

74AC191SCX Datasheet PDF Download

74AC191SCX pdf

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