74ACT157PC

Signal Switches, Multiplexers, Decoders Overview

The Fairchild Semiconductor 74ACT157PC is a high-speed quad 2-line to 1-line data selector/multiplexer belonging to the 74ACT logic family. It features four independent multiplexers with common select inputs and individual enable inputs for each section. The device operates within a supply voltage range of 4.5 V to 5.5 V, providing TTL-compatible inputs and outputs capable of sourcing and sinking 24 mA. Packaged in a 16-lead Plastic Dual-In-Line (PDIP) format, it supports through-hole mounting and functions across an industrial temperature range from -40°C to +85°C.

Signal Switches, Multiplexers, Decoders Feature Summary

• Contains four independent 2-to-1 line multiplexers with common select lines
• Features individual enable inputs for each multiplexer section
• Provides buffered outputs presenting true non-inverted data
• Offers TTL-compatible input levels for direct interface with standard logic

Signal Switches, Multiplexers, Decoders Applications

• High-speed data routing and selection in digital systems
• Parallel-to-serial conversion circuits
• Function generation using three-variable logic combinations
• Data bus switching applications requiring high fan-out capability

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific manufacturer origin, as this component may be sourced from onsemi or Fairchild Semiconductor due to corporate history. Confirm the PDIP-16 package type and lead finish details against current datasheets. Ensure the part meets required environmental standards such as RoHS compliance if applicable to your assembly process. Check for obsolescence status before finalizing procurement plans.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when designing systems requiring multiple independent data paths controlled by shared address lines. The ACT series offers superior speed compared to older LS families while maintaining compatible pinouts. Consider the 24 mA output drive strength for driving heavy loads or multiple downstream inputs without additional buffering stages.

Signal Switches, Multiplexers, Decoders Part Context

This device is part of the broader 74ACT logic family, designed to bridge the performance gap between standard CMOS and low-power Schottky TTL technologies. It shares functional compatibility with the 74HC and 74LS series but provides faster propagation delays. The 74ACT157 specifically addresses applications needing precise data selection with minimal signal distortion.

Signal Switches, Multiplexers, Decoders Replacement Considerations

The MM74HC157 serves as a functionally equivalent alternative within the HC family, offering similar pinouts and logical operations. Verify that the HC variant's wider voltage range and slightly different electrical characteristics align with the existing circuit design requirements.