M74HC240B1R

Overview

The M74HC240B1R is an octal bus buffer with three-state inverted outputs, manufactured using silicon gate C2MOS technology. It operates within a supply voltage range of 2V to 6V and features high noise immunity with input thresholds at 28% of VCC. The device provides symmetrical output impedance with a minimum drive capability of 6mA. Propagation delay is typically 10ns at 6V, while quiescent current remains low at 4μA maximum. Inputs include protection against static discharge.

Feature Summary

• Octal bus buffer architecture with three-state inverted outputs
• Symmetrical output impedance for balanced signal driving
• High noise immunity with defined input threshold levels
• Built-in protection circuits against static discharge

Applications

• Memory address drivers utilizing three-state control
• Bus-oriented transmissions requiring data buffering
• Clock drivers for high-speed digital systems

Procurement Notes

Verify component authenticity through official STMicroelectronics channels or authorized distributors. Confirm the package type matches the DIP-20 specification. Check RoHS compliance status as required by project specifications. Ensure proper handling procedures are followed due to the obsolete product status.

Selection Notes

Select this component when an octal buffer with inverted outputs is required. Consider the 2V to 6V operating range for compatibility with various logic families. Evaluate the 10ns propagation delay against system timing requirements. Verify that the DIP-20 package fits the available PCB space constraints.

Part Context

This part belongs to the M74HC series of advanced high-speed CMOS logic devices. It is functionally compatible with standard 74 Series 240 components. The device utilizes silicon gate C2MOS technology to achieve performance comparable to LS-TTL while maintaining low power consumption characteristics typical of CMOS logic families.

Replacement Considerations

Direct substitutes include the M74HC240M1R in SOP packaging and the M74HC240RM13TR in TSSOP packaging. These alternatives maintain identical pinouts and electrical characteristics while offering different form factors for surface mount applications.