SN74HCT257DRE4

Overview

The SN74HCT257DRE4 is a quadruple 2-line to 1-line data selector/multiplexer with 3-state outputs manufactured by Texas Instruments. It operates within a supply voltage range of 4.5 V to 5.5 V and features buffered inputs and outputs. The device provides high-current 3-state outputs capable of driving system buses directly, with an output drive of ±6 mA at 5 V. Typical propagation delay is 17 ns, and maximum input current is 1 µA. It supports TTL-voltage compatible inputs and low power consumption with a maximum ICC of 80 µA.

Feature Summary

• Provides four independent 2-to-1 multiplexing channels with shared address select lines
• Features 3-state outputs that interface directly with system buses without loading data lines when disabled
• Inputs are TTL-voltage compatible for direct interfacing with standard logic families

Applications

• Multiplexing signals from multiple data sources in bus-organized systems
• Providing bus interfaces between multiple sources in high-performance digital systems
• Routing data signals in computer architecture and peripheral control circuits

Procurement Notes

Verify the specific ordering suffix 'E4' against the manufacturer's latest documentation to confirm material composition and environmental compliance status. Ensure the SOIC-16 package dimensions match your PCB footprint requirements. Confirm the operating temperature range aligns with your application environment before finalizing procurement.

Selection Notes

Select this component when a quad 2-to-1 multiplexer with 3-state outputs is required for bus-oriented designs. The HCT logic series ensures compatibility with TTL-level inputs while maintaining CMOS performance characteristics. Consider the 17 ns typical propagation delay and 4.5 V to 5.5 V supply voltage constraints during circuit design.

Part Context

This part belongs to the SN74HCT257 family of quadruple 2-line to 1-line data selectors/multiplexers. It is designed for use in bus-organized systems where multiple data sources need to be routed to common output lines. The device integrates buffering for improved signal integrity and noise immunity in digital logic applications.

Replacement Considerations

SN74HCT257DR is a tape-and-reel variant of the same functional device in the SOIC-16 package. SN74HCT257N is available in a PDIP-16 package for through-hole mounting. Verify pinout compatibility and electrical specifications before substituting.