DM74ALS163BN

Counter Dividers Overview

The DM74ALS163BN is a synchronous four-bit binary counter manufactured by onsemi (formerly Fairchild) in a 16-lead Plastic Dual-In-Line Package. It features an internal carry look-ahead circuit for high-speed cascading and operates with a supply voltage range of 4.5V to 5.5V. The device supports a maximum clock frequency of 40 MHz, with propagation delays from clock to output ranging from 4ns to 20ns depending on the transition direction. It includes two count enable inputs (P and T), a synchronous load input, and a synchronous clear function.

Counter Dividers Feature Summary

• Synchronous presettable operation with simultaneous flip-flop triggering to eliminate counting spikes
• Internal carry look-ahead circuitry enables fast n-bit cascading without external gating
• Fully independent clock circuit ensures control inputs modify mode only upon stable setup times
• Functionally and pin-for-pin compatible with Schottky TTL counterparts

Counter Dividers Applications

• High-speed synchronous counting designs
• Frequency division circuits
• Digital timing sequences
• Event counters

Counter Dividers Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm package integrity and marking accuracy against the N16E specification. Check datasheet revisions for any updates to electrical characteristics or ordering information prior to finalizing procurement specifications.

Counter Dividers Selection Notes

Select this component for applications requiring synchronous binary counting with minimal propagation delay variations. Ensure the design accommodates the 4.5V to 5.5V supply voltage range and 0°C to +70°C operating temperature. Verify that the 16-pin DIP footprint fits the target PCB layout constraints.

Counter Dividers Part Context

This part belongs to the DM74ALS16xB series, which includes binary (161B/163B) and decade (162B) counters. The ALS series utilizes advanced oxide-isolated, ion-implanted Schottky technology for improved AC performance over standard Schottky and Low Power Schottky logic families.

Counter Dividers Replacement Considerations

SN74ALS163N

Counter Dividers FAQ

How does the clear function operate in the DM74ALS163BN?

The clear function is synchronous; a low level at the clear input sets all outputs LOW after the next rising clock edge.

What is the purpose of the internal carry look-ahead?

It allows for cascading multiple counters for n-bit applications without requiring additional external gating logic.