74LCX257MTR

Signal Switches, Multiplexers, Decoders Overview

The STMicroelectronics 74LCX257MTR is a low-voltage CMOS quad 2-channel multiplexer with 3-state outputs, fabricated using sub-micron silicon gate and double-layer metal wiring C2MOS technology. It operates within a supply voltage range of 2.0V to 3.6V, featuring 5V tolerant inputs and outputs. The device provides high-speed performance with a maximum propagation delay of 6.0ns at VCC = 3V. It includes power-down protection on inputs and outputs, symmetrical output impedance with a minimum drive current of 24mA at VCC = 3V, and balanced propagation delays. The component is housed in a 16-pin SOIC package.

Signal Switches, Multiplexers, Decoders Feature Summary

• Features 5V tolerant inputs and outputs for interfacing with 5V signal environments.
• Includes power-down protection on both inputs and outputs.
• Provides symmetrical output impedance with guaranteed PCI bus levels.
• Offers balanced propagation delays between select and data paths.

Signal Switches, Multiplexers, Decoders Applications

• Low power and high speed 3.3V applications
• Data routing in digital systems
• Signal selection circuits

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific package type against project requirements, as the 74LCX257 series is available in both SOP and TSSOP configurations. Confirm that the MTR suffix corresponds to the Tape & Reel packaging format required for automated assembly processes. Ensure compatibility with the target operating temperature range and voltage specifications before finalizing procurement decisions.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when designing systems requiring quad 2-channel multiplexing with 3-state outputs in a low-voltage environment. It is suitable for applications needing interface capability with 5V logic levels while operating at lower supply voltages. Consider its high-speed characteristics and power-down protection features for robust signal management in complex digital designs.

Signal Switches, Multiplexers, Decoders Part Context

The 74LCX257 belongs to the 74LCX family of low-voltage CMOS logic devices from STMicroelectronics. This family is designed for high-speed operation with low power consumption, making it ideal for modern portable and battery-operated electronic equipment. The 74LCX257 specifically functions as a non-inverting multiplexer with common select and enable inputs.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Direct pin-to-pin replacements include the 74LCX257TTR (TSSOP package) from STMicroelectronics. Other manufacturers may offer equivalent quad 2-channel multiplexers within the 74LCX logic family, but verify electrical characteristics and package dimensions carefully.

Signal Switches, Multiplexers, Decoders FAQ

What is the function of the OE input?

The OE (Output Enable) input controls the state of the outputs. When held High, all outputs enter a high-impedance state. When Low, the selected data inputs are passed to the outputs based on the SELECT input state.

How does the SELECT input determine the output?

When the SELECT input is Low, data from the A inputs is selected. When the SELECT input is High, data from the B inputs is chosen. If OE is High, the outputs remain in a high-impedance state regardless of the SELECT input.