SN74CBT3257D

Overview

The SN74CBT3257D is a 4-bit 1-of-2 high-speed TTL-compatible FET multiplexer/demultiplexer manufactured by Texas Instruments. It operates within a supply voltage range of 4 V to 5.5 V and supports an operating free-air temperature range from -40°C to 85°C. The device features low on-state resistance, with typical values ranging from 5 Ω to 14 Ω depending on the specific voltage and current conditions. Propagation delays are minimal, typically between 0.25 ns and 0.35 ns at VCC = 4 V or 5 V. The component is housed in a 16-pin SOIC package.

Feature Summary

• High-speed signal switching capability utilizing FET technology for minimal propagation delay.
• TTL-compatible input levels allowing direct interfacing with standard logic families.
• Low on-state resistance ensures efficient connections between ports with negligible signal loss.

Applications

• Signal routing between two ports
• Multiplexing and demultiplexing data lines
• Connecting A port to B1 or B2 outputs based on select control

Procurement Notes

Verify the exact part number against the manufacturer's official documentation before procurement. Confirm that the specified package type matches the design requirements. Ensure compliance with RoHS standards and check for any specific environmental certifications required for the intended application environment.

Selection Notes

Select this component when a 4-bit multiplexer with TTL compatibility is required. Consider the operating voltage range and temperature specifications to ensure suitability for the target environment. Evaluate the package constraints and thermal impedance characteristics during the PCB layout phase.

Part Context

This device belongs to the CBT series of logic ICs designed for high-speed applications. It serves as a fundamental building block for digital systems requiring signal path selection. The SN74CBT3257D specifically addresses needs for low-latency switching in consumer electronics and industrial control systems.

Replacement Considerations

Check the Package Option Addendum for status updates. The SN74CBT3257DR is listed as obsolete production. Verify if alternative packages like DBQ or PW are available replacements if the SOIC form factor is not suitable.