MC74ACT540NG

Overview

The MC74ACT540NG is an octal buffer and line driver from the 74ACT logic series, manufactured by onsemi. It features eight inverting outputs with three-state capability, housed in a 20-pin PDIP package. The device operates within a supply voltage range of 4.5 V to 5.5 V. It provides high output drive currents of 24 mA for both sourcing and sinking. The inputs are TTL-compatible, allowing direct interfacing with TTL logic circuits. The component is designed for memory address driving, clock driving, and bus-oriented applications.

Feature Summary

• Three-state outputs enable isolation from the bus when not selected
• TTL-compatible inputs ensure compatibility with standard logic families
• High drive current capability supports multiple loads
• Inverting configuration allows signal phase inversion

Applications

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

Procurement Notes

Verify the specific suffix 'NG' corresponds to the 20-pin PDIP package and lead-free compliance as documented in official datasheets. Confirm active status and RoHS compliance through manufacturer channels. Ensure the ordering part number matches the required package style and temperature range specifications before procurement.

Selection Notes

Select this component when an octal inverting buffer with three-state control is required for 5V logic systems. The TTL-compatible input threshold simplifies interface design with legacy or mixed-logic environments. The through-hole PDIP package is suitable for prototyping or applications requiring mechanical robustness over surface-mount density.

Part Context

This device belongs to the MC74ACT family of high-speed CMOS logic. It is functionally similar to other octal buffers like the MC74AC540 but offers improved switching speeds and lower power consumption typical of the ACT series. The inverting nature distinguishes it from non-inverting variants such as the MC74ACT541.

Replacement Considerations

MC74ACT540DTG (SOIC-20 package)

FAQ

Is the MC74ACT540NG inverting or non-inverting?

The MC74ACT540NG is an inverting buffer, meaning the output signal is the logical complement of the input.

What is the maximum output current capability?

The device can source and sink up to 24 mA per output pin.