54F163ADC

Overview

The National Semiconductor 54F163ADC is a high-speed TTL synchronous binary counter belonging to the F/FAST series. It features a 4-bit up-counting architecture with positive edge triggering and includes load/preset inputs for parallel data loading. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports a count rate of 75 MHz. It is housed in a 16-CDIP package (0.300 inch, 7.62 mm) and is designed for robust performance in digital timing applications.

Feature Summary

• Synchronous operation with positive edge triggering ensures precise timing control across all four bits simultaneously.
• Parallel load capability allows direct presetting of output states via dedicated input lines.
• High-speed TTL construction provides fast propagation delays suitable for demanding digital logic environments.

Applications

• Digital frequency division circuits
• Sequential event counting systems
• Timing and control logic modules

Procurement Notes

Verify the specific manufacturer origin, as National Semiconductor assets are now managed by Texas Instruments or other entities. Confirm the 16-CDIP ceramic package availability matches your board requirements. Ensure the part number suffix corresponds to the exact speed grade and temperature rating needed for your design. Cross-reference datasheets from current authorized distributors to confirm active status and electrical specifications.

Selection Notes

Select this component when a synchronous 4-bit up-counter with parallel load functionality is required in a through-hole ceramic package. It is suitable for designs needing high-speed TTL compatibility and reliable operation at 5V. Consider alternative packages if surface mount technology is preferred, or different series if asynchronous reset is required instead of synchronous clearing.

Part Context

This component is part of the standard 54F/74F logic families, widely used in industrial and military-grade digital systems. The 54F163A variant specifically offers synchronous clearing and parallel loading, distinguishing it from asynchronous counterparts like the 54F161A. It serves as a fundamental building block for complex state machines and counters in legacy and specialized hardware designs.

Replacement Considerations

The 54F161A is a related synchronous counter but features asynchronous reset rather than synchronous clearing. Verify functional equivalence regarding reset timing if substituting. Other F-series variants may offer similar pinouts but differ in speed grades or power consumption characteristics.