74ACT157MTC

Signal Switches, Multiplexers, Decoders Overview

The onsemi 74ACT157MTC is a quad 2-input multiplexer housed in a 16-lead Thin Shrink Small Outline Package (TSSOP). It selects four bits of data from two sources using common Select and Enable inputs, presenting the selected data in true form. The device operates within a supply voltage range of 4.5V to 5.5V and supports an operating temperature range of -40°C to +85°C. Outputs are capable of sourcing and sinking 24 mA. Propagation delays at 5.0V with 50 pF load range from 1.5 ns to 11.5 ns depending on the signal path.

Signal Switches, Multiplexers, Decoders Feature Summary

• Features TTL-compatible inputs for direct interfacing with standard logic families.
• Provides high-speed data selection capabilities for multiple data streams.
• Includes active-LOW Enable input to force outputs LOW when disabled.

Signal Switches, Multiplexers, Decoders Applications

• Moving data between register groups to common output busses
• Function generation implementing gating functions
• Selecting specific data paths in digital systems

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the package type matches the required footprint, as this component is available in TSSOP, SOIC, SOP, and PDIP variants. Confirm the ordering suffix corresponds to the desired packaging format, such as tape and reel options. Ensure the design accounts for the specified operating temperature and voltage limits to maintain reliability.

Signal Switches, Multiplexers, Decoders Selection Notes

Choose this component when TTL-compatible inputs are required alongside AC speed performance. It is suitable for applications needing a quad 2-input mux with significant drive capability. Consider alternative packages if board space constraints differ from the TSSOP dimensions. Verify power dissipation requirements against the thermal characteristics of the chosen enclosure.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the 74AC/ACT logic family, which combines the high speed of AC technology with the noise immunity and input compatibility of ACT standards. The 74ACT157 specifically implements a quad 2-input multiplexer function. It is manufactured under Fairchild Semiconductor specifications, now part of onsemi's portfolio.

Signal Switches, Multiplexers, Decoders Replacement Considerations

The 74AC157MTC serves as a functional equivalent within the same datasheet specification. Other package variants like 74ACT157SC or 74ACT157PC offer identical electrical performance but differ in physical housing dimensions.

Signal Switches, Multiplexers, Decoders FAQ

How does the Enable input affect the outputs?

The Enable input is active-LOW. When HIGH, all outputs are forced LOW regardless of other inputs. When LOW, the outputs reflect the data selected by the Select input.

Can this device be used as a function generator?

Yes, it can generate any four of sixteen different functions of two variables with one variable common, which is useful for implementing gating functions.