TC74HC540AF(EL,F)

Overview

The TC74HC540AF(EL,F) is an octal bus buffer featuring inverting, three-state outputs. Fabricated using Toshiba's silicon gate C2MOS technology, it provides high-speed operation comparable to LSTTL with low power dissipation. The device operates within a supply voltage range of 2 V to 6 V and supports an operating temperature from -40°C to 85°C. It includes input protection circuits against static discharge and transient excess voltage.

Feature Summary

• High-speed operation with symmetrical output impedance
• Low power dissipation maintaining CMOS efficiency
• Wide operating voltage range for flexible system integration
• Pin and function compatibility with standard logic families

Applications

• Data bus buffering applications
• Clock distribution networks
• Memory address/data register interfaces
• General-purpose digital signal isolation

Procurement Notes

Verify the specific package suffix (AF indicates SOP-20) matches the target PCB footprint. Confirm RoHS compliance status through official Toshiba channels prior to procurement. Ensure design accounts for the absolute maximum ratings regarding supply voltage and current limits to maintain reliability.

Selection Notes

Select this component when inverting octal buffering with three-state control is required. The AF variant is suitable for surface-mount assembly. Consider the 2V to 6V operating range for systems requiring lower or higher than standard 5V logic levels. Verify that the 15 LSTTL load drive capability meets the fan-out requirements of the destination circuitry.

Part Context

This part belongs to the TC74HC540/541AP/AF series of octal bus buffers. The TC74HC540A specifically denotes the inverting output configuration, while the TC74HC541A provides non-inverting outputs. Both share identical pinouts and electrical characteristics, differing only in logical polarity.

Replacement Considerations

Direct functional substitutes include the SN74HCT540N. Verify voltage level compatibility, as HCT variants typically require 5V supplies whereas HC devices operate from 2V to 6V.