TC74LCX540FK(EL,K)

Overview

The TC74LCX540FK(EL,K) is a low-voltage octal bus buffer with inverted outputs and 5-V tolerant inputs/outputs. It operates within a supply voltage range of 1.65 V to 3.6 V, supporting 3.3-V systems while interfacing with 5-V environments. The device features two active-low output enables (1OE, 2OE) for three-state control. Propagation delay is 6.5 ns maximum at 3.0–3.6 V. Output drive current reaches 24 mA minimum at 3.0 V. Quiescent current is 10 µA max. It includes power-down protection on all I/Os and static discharge protection on inputs.

Feature Summary

• Provides five-volt tolerant input and output capabilities for mixed-voltage system interfacing
• Features dual active-low output enables for precise three-state bus control
• Includes power-down protection circuits on all inputs and outputs to prevent leakage during off-states
• Offers pin and function compatibility with standard 74 series logic devices

Applications

• Three-state memory address drivers
• Clock distribution buffers
• Bus-oriented transmissions
• Low-voltage (3.3 V) system data routing

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and reel specifications. Ensure the procurement request explicitly references the full part number TC74LCX540FK(EL,K) to distinguish from similar variants in the LCX family. Confirm RoHS compliance status directly with the supplier or through the latest datasheet revision notes prior to finalizing orders.

Selection Notes

Select this component when designing 3.3-V systems requiring interface with 5-V logic levels without external level shifters. The low quiescent current makes it suitable for battery-powered applications. Verify that the required propagation delay meets the 6.5 ns specification at the target operating voltage. Ensure unused inputs are tied to VCC or GND to maintain stable operation.

Part Context

This device belongs to Toshiba's LCX logic family, designed for low-voltage CMOS applications. It serves as an octal bus buffer, providing eight independent channels of signal buffering. The FK suffix indicates the VSSOP-20 package variant. It complements other 74-series compatible buffers like the HC and AC families by offering lower voltage operation and reduced power consumption.

Replacement Considerations

Pin and function compatible with 74AC/VHC/HC/F/ALS/LS 540 types. Verify voltage tolerance requirements match the 5-V tolerant specification of the LCX series when substituting with standard HC or AC variants.