SN74CBT3257DR

Overview

The SN74CBT3257DR is a 4-bit 1-of-2 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 temperature range from -40°C to 85°C. The device features TTL-compatible input levels, ensuring compatibility with standard logic families. Key electrical characteristics include a typical on-state resistance (ron) of 14 Ω at VCC = 4 V and 10 Ω at VCC = 4.5 V. Propagation delay (tpd) ranges from 0.25 ns to 0.35 ns depending on the supply voltage. The component is housed in a 16-pin SOIC package.

Feature Summary

• High-speed switching capability with low on-state resistance for minimal propagation delay
• TTL-compatible input levels allowing direct interfacing with standard logic circuits
• Bidirectional data flow support through configurable output-enable and select-control inputs

Applications

• Data routing in high-speed digital systems
• Signal path selection in communication equipment
• Bus exchange applications requiring fast switching speeds

Procurement Notes

Verify the specific ordering suffix 'DR' corresponds to the tape and reel packaging format required for your assembly line. Confirm that the 16-pin SOIC package dimensions align with your PCB footprint design guidelines. Ensure that the supply voltage requirements match your system's power rails, as the device is rated for 4 V to 5.5 V operation. Check for any recent product life cycle notices regarding obsolescence or alternative recommendations.

Selection Notes

Select this component when a 4-channel multiplexer with TTL-compatible inputs is required. The SN74CBT3257DR is suitable for applications needing low on-state resistance and fast propagation delays. Consider the 16-pin SOIC package if surface-mount technology is preferred. Evaluate the 4 V to 5.5 V supply voltage range against your system's power availability. Compare performance metrics such as propagation delay and on-resistance with other available multiplexers to ensure optimal system performance.

Part Context

The SN74CBT3257 belongs to the CBT/FST/QS/5C/B logic series from Texas Instruments. It is part of a family of high-speed CMOS logic devices designed for demanding digital applications. The SN74CBT3257 specifically focuses on multiplexing and demultiplexing functions with four independent channels. Its design emphasizes speed and compatibility with TTL logic standards, making it a versatile choice for various signal routing tasks.

Replacement Considerations

Public confirmed substitute part numbers are not explicitly listed in the provided documentation. Verify compatibility with existing designs before considering alternatives.