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DM74AS163 - Synchronous 4-Bit Counter

Download the DM74AS163 datasheet PDF. This datasheet also covers the DM74AS161 variant, as both devices belong to the same synchronous 4-bit counter family and are provided as variant models within a single manufacturer datasheet.

General Description

These synchronous presettable counters feature an internal carry look ahead for application in high speed counting designs.

The DM74AS161 and DM74AS163 are 4-bit binary counters.

The DM74AS161 clear asynchronously, while the DM74AS163 clear synchronously.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (DM74AS161_FairchildSemiconductor.pdf) that lists specifications for multiple related part numbers.

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Other Datasheets by Fairchild (now onsemi)

Part Number Description
DM74AS161 Synchronous 4-Bit Counter with Asynchronous Clear . Synchronous 4-Bit Counter
DM74AS169A Synchronous 4-Bit Binary Up/Down Counter
DM74AS10 Triple 3-Input NAND Gate
DM74AS1000A Quadruple 2-Input NAND Driver
DM74AS1004A Hex Inverting Driver

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
DM74AS161 • DM74AS163 Synchronous 4-Bit Counter with Asynchronous Clear • Synchronous 4-Bit Counter April 1984 Revised March 2000 DM74AS161 • DM74AS163 Synchronous 4-Bit Counter with Asynchronous Clear • Synchronous 4-Bit Counter General Description These synchronous presettable counters feature an internal carry look ahead for application in high speed counting designs. The DM74AS161 and DM74AS163 are 4-bit binary counters. The DM74AS161 clear asynchronously, while the DM74AS163 clear synchronously. The carry output is decoded to prevent spikes during normal counting mode of operation. Synchronous operation is provided by having all flip-flops clocked simultaneously so that outputs change coincident with each other when so instructed by count enable inputs and internal gating.