MM74HCT257MX

Signal Switches, Multiplexers, Decoders Overview

The MM74HCT257MX is a high-speed silicon-gate CMOS device belonging to the HCT logic series. It functions as a quad 2-input multiplexer with three-state outputs, designed for pin compatibility with Low-power Schottky TTL (LSTTL). The component selects four bits of data from two sources controlled by a common data select input. Data appears at the outputs in true form when enabled. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature range from -40 °C to +85 °C. It is housed in a 16-pin SOIC package.

Signal Switches, Multiplexers, Decoders Feature Summary

• Quad 2-input multiplexer architecture with non-inverting data path
• Three-state outputs allowing direct interface with system buses
• CMOS technology ensuring compatibility with LSTTL logic levels

Signal Switches, Multiplexers, Decoders Applications

• Data routing in digital communication systems
• Signal selection in microprocessor-based control circuits
• Bus switching applications requiring tri-state isolation

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the manufacturer origin carefully, as National Semiconductor is now part of Texas Instruments. Confirm the specific suffix 'MX' corresponds to the SOIC-16 surface-mount package. Check RoHS compliance status and lead times due to potential discontinuation or lifecycle changes associated with legacy HCT series components. Ensure the source provides valid datasheets matching the MM74HCT257 specification.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when a quad 2-to-1 multiplexer with tri-state capability is required in a design utilizing HCT logic levels. It serves as a suitable replacement for older LSTTL multiplexers where lower power consumption is desired. Consider the SOIC-16 package constraints for PCB layout. Verify that the input voltage levels match the HCT standard requirements for proper logic threshold interpretation.

Signal Switches, Multiplexers, Decoders Part Context

This component belongs to the 74HCT family of high-speed CMOS logic devices. The 74HCT series bridges the gap between standard CMOS and TTL logic families, offering noise immunity and low power dissipation while maintaining TTL-compatible input thresholds. The MM74HCT257 variant specifically implements the multiplexer function within this standardized logic ecosystem.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Compatible substitutes include the NXP 74HC257D/T3 and the Texas Instruments SN74HCT257N. Verify pinout compatibility and electrical characteristics before substitution.