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74AC191 - Up/Down Counter

Download the 74AC191 datasheet PDF. This datasheet also covers the 74AC variant, as both devices belong to the same up/down counter family and are provided as variant models within a single manufacturer datasheet.

Description

The AC191 is a reversible modulo 16 binary counter.

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. Features s ICC reduced by 50% s High speed.
  • 133 MHz typical count frequency s Synchronous counting s Asynchronous parallel load s Casca.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (74AC-191.pdf) that lists specifications for multiple related part numbers.

📁 Similar Datasheet

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Other Datasheets by Fairchild (onsemi)

Part Number Description
74AC10 Triple 3-Input NAND Gate
74AC109 Dual JK Positive Edge-Triggered Flip-Flop
74AC11 Triple 3-Input AND Gate
74AC125 Quad Buffer
74AC138 1-of-8 Decoder/Demultiplexer

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.

View original datasheet text
74AC191 Up/Down Counter with Preset and Ripple Clock November 1988 Revised November 1999 74AC191 Up/Down Counter with Preset and Ripple Clock General Description The AC191 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.
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