54F251ADC

Overview

The 54F251ADC is an 8-input multiplexer from the F/FAST series manufactured by National Semiconductor. It features a single circuit configuration with eight data inputs, three address select lines, and one enable input. The device provides both true and complementary outputs in a TRI-STATE format. It operates within the TTL logic family and utilizes a 16-pin CDIP package with a 0.300-inch (7.62mm) width. Electrical specifications include an output high current of 3mA and an output low current of 20mA.

Feature Summary

• Provides 8-to-1 data selection capability with dedicated address inputs
• Features TRI-STATE outputs for bus-oriented applications
• Delivers complementary output signals for versatile logic interfacing

Applications

• Data routing in digital communication systems
• Address decoding in memory architectures
• Signal switching in industrial control panels

Procurement Notes

Verify the manufacturer designation as National Semiconductor or its successors, such as Texas Instruments, due to corporate acquisitions. Confirm the specific suffix 'ADC' corresponds to the 16-CDIP package variant. Request original datasheets to validate electrical characteristics against current standards. Ensure component authenticity through authorized distribution channels to avoid counterfeit logic ICs.

Selection Notes

Select this component when an 8-channel multiplexer with TRI-STATE functionality is required. The F/FAST series offers speed advantages over standard TTL variants. Consider the CDIP package constraints for through-hole mounting requirements. Verify voltage levels match the system's TTL logic thresholds before integration into the design.

Part Context

This part belongs to the National Semiconductor F/FAST logic series, designed for high-speed digital applications. The 54F251 series represents a standard 8-line multiplexer architecture. The ADC suffix specifically denotes the ceramic dual in-line package configuration. This component serves as a fundamental building block for complex digital signal processing circuits.

Replacement Considerations

The 54F251ADM is a documented alternative offering identical functional specifications in a different package style. Verify pin compatibility and electrical parameters before substituting components in existing designs.