74HC540D,652

Overview

The Nexperia 74HC540D,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 utilizes a 20-lead SOIC plastic small outline package (SOT163-1). The device incorporates two active LOW output enable inputs (OE1 and OE2) that force the outputs into a high-impedance OFF-state when asserted HIGH. Inputs are equipped with clamp diodes to facilitate interfacing with voltages exceeding VCC using current limiting resistors.

Feature Summary

• Features dual active LOW output enables for flexible control of the three-state logic levels
• Incorporates input clamp diodes to allow safe interfacing with voltages higher than the supply rail
• Provides robust latch-up performance exceeding specified JEDEC Class II Level B standards

Applications

• Carrying bus-oriented memories and registers
• Clock drivers and buffered clock circuits
• Memory and memory architecture implementations

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the exact package type and temperature rating. Confirm compliance with relevant RoHS directives and REACH regulations prior to integration. Ensure design margins account for the absolute maximum ratings defined in the product data sheet to prevent permanent damage during operation.

Selection Notes

Select this component for applications requiring wide supply voltage flexibility between 2.0 V and 6.0 V. The 74HC540D variant specifically supports CMOS input levels. Consider the thermal derating characteristics of the SO20 package if operating near the upper limits of the recommended ambient temperature range or total power dissipation thresholds.

Part Context

This part belongs to the 74HC/HCT family of high-speed CMOS logic devices manufactured by Nexperia. The 'D' suffix indicates the SO20 plastic small outline package variant. It serves as a standard octal buffer solution compatible with various digital logic families, providing signal buffering and line driving capabilities for complex electronic systems.

Replacement Considerations

The 74HC540DB variant offers the same logical functionality but utilizes an SSOP20 package instead of the SO20 form factor.