SN74S157D

Signal Switches, Multiplexers, Decoders Overview

The SN74S157D is a quadruple 2-line to 1-line data selector/multiplexer manufactured by Texas Instruments. It features buffered inputs and outputs, operating within a supply voltage range of 4.75 V to 5.25 V. The device provides four independent multiplexers, each selecting one of two data sources based on a common select input. Typical propagation delay times are 5 ns for the S-series logic family. It supports an operating free-air temperature range of 0°C to 70°C.

Signal Switches, Multiplexers, Decoders Feature Summary

• Contains four independent 2-to-1 multiplexers with buffered inputs and outputs.
• Features a separate strobe input to control data routing.
• Selects a 4-bit word from one of two sources and routes it to four outputs.

Signal Switches, Multiplexers, Decoders Applications

• Multiplexing dual data buses
• Expanding any data input point
• Generating four functions of two variables where one variable is common

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific ordering suffix against the manufacturer's current package option addendum to confirm lead finish, moisture sensitivity level, and environmental compliance status. Ensure the selected variant matches the required packaging type and quantity specifications for your assembly process.

Signal Switches, Multiplexers, Decoders Selection Notes

Choose this component when high-speed data selection is required within the standard TTL voltage range. Compare propagation delays and power dissipation against LS or HC families if lower power consumption is prioritized over speed. Confirm that the buffered output drive capability meets the load requirements of the destination circuitry.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the SN74xx157 series of quadruple 2-line to 1-line data selectors. It shares functional similarities with the SN74LS157 but offers faster switching speeds typical of the S-TTL logic family. The 'D' suffix indicates a small-outline integrated circuit (SOIC) package configuration.

Signal Switches, Multiplexers, Decoders Replacement Considerations

SN74S158N

Signal Switches, Multiplexers, Decoders FAQ

Does the SN74S157D invert the selected data?

No, the SN74S157 presents true data to the outputs. The SN74S158 variant presents inverted data.

What is the function of the G input?

The G input serves as a strobe. When active, it enables the selection of data from the A or B inputs to the Y outputs based on the state of the Select A/B input.