74HC540N,652

Overview

The 74HC540N,652 is an octal buffer and line driver featuring inverting outputs with three-state capability. It operates within a supply voltage range of 2.0 V to 6.0 V and supports ambient temperatures from -40 °C to +125 °C. The device includes two active-low output enable inputs (OE1 and OE2) that control the high-impedance OFF-state. Input pins are equipped with clamp diodes to allow interfacing with voltages exceeding VCC using current-limiting resistors.

Feature Summary

• Features dual active-low output enables for independent control of the three-state logic levels.
• Incorporates input clamp diodes to facilitate safe interface with external voltages higher than the supply rail.
• Provides robust latch-up protection exceeding specified JESD 78 Class II Level B standards.

Applications

• High-speed data bus buffering applications
• Clock distribution circuits requiring signal inversion
• Memory address and data line drivers

Procurement Notes

Verify the specific package type against the ordering information table, as the suffix 'N' indicates a PDIP variant which may not be listed in the latest revision compared to SO or SSOP options. Confirm the manufacturer source, as Nexperia acquired NXP's standard products portfolio. Ensure the component meets the required temperature grade for the intended operating environment.

Selection Notes

Select this component when an octal inverting buffer with tri-state outputs is required. Verify that the system logic levels match the CMOS input specifications of the HC series. Consider the power dissipation limits and thermal derating characteristics if multiple devices are used simultaneously in a confined space.

Part Context

This part belongs to the 74HC family of high-speed CMOS logic devices manufactured by Nexperia. It serves as a digital buffer designed to drive loads and isolate stages in complex digital systems. The device is widely utilized in microprocessor-based designs for managing data flow and signal integrity across various logic families.

Replacement Considerations

Direct functional equivalents include the 74HCT540 for TTL-compatible input levels. Other manufacturers produce compatible octal buffers such as the SN74HC540. Verify pinout compatibility and electrical parameters before substituting components from different suppliers.