74HC540DB,118

Overview

The Nexperia 74HC540DB,118 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 the SSOP20 (SOT339-1) package. The device incorporates two active-low output enable inputs (OE1 and OE2) to control high-impedance states. Input pins include clamp diodes for interfacing with voltages exceeding VCC. Recommended operating temperatures extend from -40 °C to +125 °C.

Feature Summary

• Features dual active-low output enables for independent control of three-state logic levels
• Incorporates input clamp diodes to facilitate safe interfacing with voltages higher than the supply rail
• Provides high noise immunity and low power dissipation characteristics typical of CMOS technology

Applications

• Memory address and data bus buffering applications
• Clock distribution circuits requiring signal inversion and isolation
• General-purpose digital signal routing in embedded systems

Procurement Notes

Verify the specific ordering suffix matches the required package type, as the DB designation indicates the SSOP20 variant. Confirm that the HC logic family aligns with the target system's voltage requirements, noting that HCT variants are not available in this specific package configuration. Ensure design compliance with the specified thermal derating curves for the selected ambient temperature conditions.

Selection Notes

Select this component when an octal inverting buffer with tri-state outputs is required in a compact surface-mount form factor. The wide supply voltage range supports various logic families. Verify that the propagation delay specifications meet the timing constraints of the application. Consider the pinout compatibility if replacing existing designs utilizing standard SOIC packages.

Part Context

This part belongs to the 74HC series of high-speed CMOS logic devices manufactured by Nexperia. The 74HC540 specifically provides eight identical inverting buffer circuits. The DB suffix identifies the plastic shrink small outline package with twenty leads. This component serves as a fundamental building block for digital interface and signal conditioning tasks.

Replacement Considerations

Direct replacements must maintain the 74HC540 logic function and SSOP20 package. Verify pin-to-pin compatibility regarding the dual output enable configuration. Cross-reference dynamic characteristics such as propagation delay and transition times to ensure signal integrity is preserved in the target circuit.