DM74LS163AN

Counter Dividers Overview

The DM74LS163AN is a synchronous 4-bit binary counter manufactured by onsemi in a 16-lead Plastic Dual-In-Line (PDIP) package. It features internal carry look-ahead for high-speed counting and diode-clamped inputs to suppress switching spikes. The device operates with a supply voltage range of 4.75 V to 5.25 V and supports a maximum clock frequency of 25 MHz under standard conditions. Key electrical characteristics include a typical propagation delay from clock to output of 27 ns, a typical power dissipation of 93 mW, and an operating temperature range of 0°C to +70°C.

Counter Dividers Feature Summary

• Synchronous operation ensures all flip-flops are clocked simultaneously to eliminate output counting spikes associated with asynchronous counters.
• Internal carry look-ahead circuitry enables cascading for n-bit applications without additional external gating.
• Fully programmable design allows outputs to be preset to specific levels synchronously via the load control line.
• Diode-clamped inputs provide protection against fast-rising input voltages.

Counter Dividers Applications

• High-speed synchronous counting designs
• N-bit cascaded counter systems
• Frequency division circuits
• Digital timing sequences

Counter Dividers Procurement Notes

Verify that the component matches the DM74LS163AN designation specifically, as the datasheet also covers the DM74LS161A which differs in clear functionality. Confirm the package type is 16-PDIP (JEDEC MS-001). Ensure the manufacturer is identified correctly, noting historical Fairchild Semiconductor origins now part of onsemi. Check for RoHS compliance status if required for modern assembly processes.

Counter Dividers Selection Notes

Select this component when synchronous clearing is required, distinguishing it from the asynchronous clear variant. The internal carry look-ahead makes it suitable for designs requiring minimal propagation delay between cascaded stages. Verify that the logic family requirements align with LS specifications regarding speed and power consumption. Ensure the application environment stays within the specified 0°C to +70°C temperature range.

Counter Dividers Part Context

This device belongs to the 74LS series of logic integrated circuits, designed for low-power Schottky TTL applications. It is functionally related to the DM74LS161A, sharing identical pinouts and most features, but differs primarily in the synchronization of the reset function. The DM74ALS163BMX represents a faster Advanced Low-power Schottky equivalent available from the same manufacturer.

Counter Dividers Replacement Considerations

SN74LS163AN