MC74HC540AFELG

Overview

The MC74HC540AFELG is an octal inverting buffer and line driver manufactured by onsemi. It utilizes high-performance silicon-gate CMOS technology to provide robust signal buffering for bus-oriented systems, memory address drivers, and clock drivers. The device features inputs and outputs located on opposite sides of the package to facilitate printed circuit board layout. It operates within a supply voltage range of 2.0 V to 6.0 V and includes two ANDed active-low output enables.

Feature Summary

• Octal 3-state inverting buffer design with inputs and outputs positioned on opposite package sides for optimized PCB routing.
• Dual active-low output enable pins (OE1 and OE2) that are internally ANDed to control high-impedance states.
• Outputs directly interface with CMOS, NMOS, and TTL loads, supporting up to 15 LSTTL loads.
• High noise immunity characteristic of CMOS devices with low input current consumption.

Applications

• Memory address drivers
• Clock drivers
• Bus-oriented systems

Procurement Notes

Verify the specific suffix 'FELG' against official ordering lists as datasheet documentation primarily references DWG and DTG suffixes. Confirm RoHS compliance and Pb-free status through manufacturer compliance channels. Ensure automotive qualification requirements are met if the '-Q' suffix is required for unique site control changes.

Selection Notes

Select this component when an octal inverting buffer with 3-state capability is required for high-speed digital interfaces. The HC540A is functionally similar to the HC541A but provides inverted outputs. Consider the wide operating temperature range and high noise immunity for industrial environments requiring reliable CMOS logic interfacing.

Part Context

This part belongs to the MC74HC540A family of octal buffers. It shares pinout compatibility with LS540 devices while offering superior speed and lower power consumption typical of CMOS technology. The device is designed to replace older logic families in modern high-density electronic designs requiring efficient signal distribution.

Replacement Considerations

The MM74HC540 is a non-inverting alternative from the same series. For direct functional replacement, verify pinout compatibility with LS540 standards. Check if the application requires inverting or non-inverting logic before substituting with related HC541 variants.