M74HC240TTR

Overview

The M74HC240TTR is an octal bus buffer with inverted 3-state outputs manufactured by STMicroelectronics. It utilizes advanced high-speed CMOS silicon gate C2MOS technology and operates within a supply voltage range of 2V to 6V. The device features balanced propagation delays, symmetrical output impedance, and high noise immunity. It includes protection circuits against static discharge and transient excess voltage on all inputs.

Feature Summary

• Octal bus buffer configuration with inverted 3-state outputs
• Advanced high-speed CMOS fabrication using silicon gate C2MOS technology
• High noise immunity with input thresholds defined as a percentage of VCC
• Symmetrical output impedance ensuring balanced drive capabilities

Applications

• Memory address drivers utilizing 3-state control
• Digital signal buffering in high-speed logic systems
• Bus interface applications requiring wide operating voltage ranges

Procurement Notes

Verify component status carefully as the datasheet explicitly identifies this part as obsolete. Confirm availability through secondary market channels or authorized distributors holding existing stock. Ensure that any replacement strategy accounts for the discontinuation of this specific package variant while maintaining functional compatibility with the original design requirements.

Selection Notes

Select this component when designing systems requiring octal buffering with inverted logic and 3-state control capabilities. It is suitable for applications demanding high-speed operation with low power dissipation across a wide voltage spectrum. Consider the TSSOP-20 package constraints and verify that the required operating temperature range aligns with the specified industrial limits provided in the electrical characteristics.

Part Context

This component belongs to the M74HC240 series of octal bus buffers produced by STMicroelectronics. It is designed to be pin and function compatible with standard 74 Series 240 devices, facilitating direct upgrades or replacements in legacy designs. The TTR suffix indicates the TSSOP-20 tape and reel packaging format intended for automated surface-mount assembly processes.

Replacement Considerations

The datasheet lists M74HC240B1R (DIP) and M74HC240RM13TR (SOP) as alternative packages within the same family. Verify mechanical footprint differences if switching between DIP, SOP, and TSSOP variants. No cross-manufacturer substitutes are confirmed in the source material.