74LCX540FT

Overview

The Toshiba Semiconductor and Storage 74LCX540FT is a low-voltage octal bus buffer featuring inverted logic with 5-V tolerant inputs and outputs. It operates within a supply voltage range of 1.65 V to 3.6 V, achieving high-speed performance with a maximum propagation delay of 6.5 ns at 3.0 V to 3.6 V. The device provides a minimum output current of 24 mA and includes power-down protection on all pins. Packaged in a TSSOP20B format, it supports an operating temperature range from -40 °C to 85 °C.

Feature Summary

• Low-voltage operation compatible with 3.3-V systems while interfacing with 5-V environments
• High-speed CMOS technology ensuring fast signal transitions with minimal power dissipation
• Dual active-low output enables allowing flexible three-state control for memory address drivers
• Integrated protection circuits against static discharge on all input and output terminals

Applications

• Three-state memory address drivers
• Clock distribution buffers
• Bus-oriented transmissions
• Memory and command addressing

Procurement Notes

Verify the specific ordering suffix matches the required package variant, as standard designations may differ from specialized industrial or automotive grades. Confirm RoHS compliance status directly with the manufacturer or authorized distributor before finalizing procurement orders. Ensure the component version aligns with the latest datasheet revision to guarantee accurate electrical characteristics and pin assignments.

Selection Notes

Select this component when designing low-voltage digital interfaces requiring high drive capability and noise immunity. The 5-V tolerance allows direct connection between 3.3-V logic sources and 5-V loads without level shifting. Consider the dual enable pins for complex bus arbitration scenarios where independent control of output states is necessary for system reliability.

Part Context

This part belongs to the 74LCX series of advanced low-voltage CMOS logic devices manufactured by Toshiba Semiconductor and Storage. The LCX family is engineered to provide performance comparable to older bipolar technologies while maintaining modern CMOS power efficiency. It serves as a direct functional replacement for legacy 74LVC and ALVC octal buffers in compact surface-mount designs.

Replacement Considerations

The device is pin and function compatible with other 74-series 540 type buffers such as those from the LVC or ALVC families. Verify that substitute components support the same 5-V tolerant I/O specifications and meet the required propagation delay thresholds for the target application timing constraints.