74HCT540D,652

Overview

The Nexperia 74HCT540D,652 is an octal buffer and line driver featuring inverting outputs with three-state capability. It operates within a supply voltage range of 4.5 V to 5.5 V. The device includes two active-low output enable inputs (OE1 and OE2) that control the high-impedance OFF-state. Inputs are equipped with clamp diodes to facilitate interfacing with voltages exceeding VCC using current-limiting resistors. The component utilizes a SOIC-20 plastic small outline package.

Feature Summary

• Features dual active-low output enables for flexible bus management
• Provides inverting logic functionality with three-state outputs
• Includes input clamp diodes for extended voltage interfacing

Applications

• Bus-oriented memory and address drivers
• Clock drivers and buffer circuits
• Line driver applications requiring signal inversion

Procurement Notes

Verify the specific ordering suffix against the manufacturer's latest documentation to confirm package type and temperature range specifications. Confirm RoHS compliance status directly with the supplier or official datasheet before procurement. Ensure design-in compatibility with existing system voltage levels and interface requirements.

Selection Notes

Select this component when an octal inverting buffer with three-state control is required for HCT logic systems. Verify that the operating environment falls within the specified -40 °C to +125 °C temperature range. Ensure the application does not exceed the absolute maximum ratings for supply voltage or output current to prevent permanent device damage.

Part Context

This part belongs to the 74HCT series of CMOS logic devices manufactured by Nexperia. It is functionally compatible with standard TTL logic levels while maintaining CMOS power dissipation characteristics. The device serves as a general-purpose digital logic component for signal buffering and driving in electronic circuits.

Replacement Considerations

Direct replacements include other 74HCT540 variants from different manufacturers that meet the same electrical specifications and pinout configuration. Verify package dimensions and thermal characteristics when substituting with alternative suppliers' components.

FAQ

How do the output enable inputs function?

The device has two output enable inputs, OE1 and OE2, which are active LOW. When either input is HIGH, all outputs assume a high-impedance OFF-state.

What is the purpose of the input clamp diodes?

The input clamp diodes allow the use of current-limiting resistors to interface the inputs to voltages in excess of VCC without damaging the device.