54ALS169B-E/883

Overview

The 54ALS169B-E/883 is a synchronous 4-bit up/down counter manufactured using advanced ALS-TTL technology. It features parallel data loading capabilities and operates within a standard 5 V supply voltage range. The component is designed for high-speed counting applications with defined propagation delays characteristic of the ALS logic family.

Feature Summary

• Synchronous operation ensures all flip-flops change state simultaneously on the clock edge
• Supports bidirectional counting via dedicated up/down control input
• Enables parallel data presetting for immediate value initialization

Applications

• Digital timing sequences requiring precise synchronization
• Frequency division circuits in communication systems
• Address generation modules in embedded controllers

Procurement Notes

Verify the MIL-STD-883 Class C screening level and ceramic package construction to ensure compliance with military specifications. Confirm the presence of the 'E' suffix indicating environmental compliance or specific processing requirements as defined by National Semiconductor documentation. Validate that the part number matches the exact synchronous counter configuration rather than generic TTL variants.

Selection Notes

Select this component when synchronous counting with parallel load functionality is required in harsh environments. The ALS technology offers a balance between speed and power consumption suitable for military-grade applications. Ensure the system design accommodates the specific electrical characteristics of the 54-series logic family, including noise immunity and drive capability.

Part Context

This device belongs to the 54ALS series of logic integrated circuits produced by National Semiconductor. The 54-series designation indicates military-grade temperature ranges and reliability standards. As a 4-bit counter, it serves as a fundamental building block for digital arithmetic and timing operations within complex logic systems.

Replacement Considerations

Direct substitutes include other 54ALS169 variants from compatible manufacturers that maintain identical pinouts and functional specifications. Verify that any replacement also meets MIL-STD-883 requirements if military qualification is mandatory for the application.