DM74AS158M

Overview

The DM74AS158M is a multiplexer belonging to the AS Series, featuring four independent functions with two line inputs and one line output per function. It provides inverted outputs and operates within the TTL logic family. The component is housed in a 16-lead Small Outline Integrated Circuit (SOIC) package, specifically identified as MS-012 with a 0.150-inch width. This device is designed for high-speed data selection applications requiring advanced Schottky performance characteristics.

Feature Summary

• Contains four independent 2-line to 1-line data selectors/multiplexers
• Provides inverted outputs for each selected channel
• Utilizes Advanced Schottky process for improved switching speed
• Features buffered inputs and outputs for signal integrity

Applications

• Data routing in microprocessor systems
• Memory address decoding
• Asynchronous bidirectional data buses

Procurement Notes

Verify the specific manufacturer source, as Rochester Electronics distributes components sourced from original manufacturers. Confirm the package type matches the required SOIC-16 footprint. Ensure compatibility with existing TTL logic levels and power supply requirements before integration into the design.

Selection Notes

Select this component when high-speed data multiplexing is required with inverted output polarity. Compare propagation delay specifications against system timing constraints. Verify that the 16-pin SOIC package fits the available board space and manufacturing capabilities.

Part Context

This part belongs to the Fairchild Semiconductor DM74AS series of logic integrated circuits. The AS series represents an advancement over standard Schottky logic, offering faster switching speeds with lower power dissipation. It is functionally compatible with other devices in the 74AS and 74LS families, facilitating design upgrades.

Replacement Considerations

Direct substitutes include SN74AS158D from Texas Instruments. Verify pinout compatibility and electrical parameters such as propagation delay and output drive current to ensure seamless replacement without circuit modification.