M74HC251TTR

Overview

The M74HC251TTR is an 8-channel multiplexer with three-state outputs fabricated using silicon gate C2MOS technology. It features true (Y) and complementary (W) outputs controlled by a strobe input. The device operates within a supply voltage range of 2V to 6V, providing high noise immunity and symmetrical output impedance. Propagation delay is typically 17ns at 6V, with balanced delays between paths.

Feature Summary

• Provides eight selectable data inputs routed to a single output based on address selection
• Features both true and complementary outputs for flexible logic interfacing
• Includes a strobe input that forces outputs into a high-impedance state when active
• Incorporates protection circuits against static discharge and transient excess voltage

Applications

• Data routing in digital communication systems
• Signal switching in measurement equipment
• Address decoding in microprocessor-based systems

Procurement Notes

Verify the specific package type required for your design, as the M74HC251 series is available in DIP, SOP, and TSSOP configurations. Confirm that the TTR suffix corresponds to the Tape and Reel packaging format suitable for automated assembly processes. Ensure compatibility with your board's footprint dimensions before finalizing procurement orders.

Selection Notes

Select this component when an 8-to-1 multiplexing function with tri-state capability is needed. It is suitable for applications requiring low power dissipation and high-speed operation within standard CMOS voltage ranges. Consider the TSSOP package for space-constrained designs requiring surface-mount technology.

Part Context

This part belongs to the M74HC series of high-speed CMOS logic devices manufactured by STMicroelectronics. It is functionally compatible with the industry-standard 74HC251 logic family, ensuring pinout and operational equivalence with other manufacturers' equivalents in the same logic category.

Replacement Considerations

Compatible substitutes include MC74HC251 from onsemi and SN74HC251 from Texas Instruments. Verify that replacement parts maintain the same TSSOP-16 package and electrical characteristics to ensure direct interchangeability without circuit redesign.