74LCX240FT

Overview

The 74LCX240FT is a low-voltage octal bus buffer with inverted outputs, manufactured by Toshiba Semiconductor and Storage. It operates within a supply voltage range of 1.65 V to 3.6 V and supports 5-V tolerant inputs and outputs. The device features two active-low output enables for three-state control. Key electrical parameters include a maximum propagation delay of 6.5 ns at 3.0 V to 3.6 V, and a minimum output current capability of ±24 mA at 3.0 V. It is housed in a TSSOP20B package.

Feature Summary

• Low-voltage CMOS technology designed for high-speed operation while maintaining low power dissipation.
• Provides 5-V tolerance on both input and output pins, facilitating interface between 3.3-V systems and 5-V environments.
• Includes power-down protection on all inputs and outputs to prevent excessive current flow during power-off states.

Applications

• Memory address drivers requiring 3-state control
• Clock drivers and buffering
• Bus-oriented transmissions

Procurement Notes

Verify the specific ordering suffix matches the required packaging format, as standard datasheets may list multiple options. Confirm RoHS compliance status directly with the manufacturer or authorized distributor, as environmental declarations can vary by production batch. Ensure the component version aligns with the latest revision specified in the official documentation to guarantee functional compatibility.

Selection Notes

Select this component when an octal buffer with inverted logic is required for low-voltage applications. It is suitable for designs needing 5-V tolerant I/O capabilities to bridge different voltage domains. Consider the TSSOP20B package constraints and the specific propagation delay requirements relative to the operating supply voltage range.

Part Context

This part belongs to the 74LCX series of low-voltage CMOS logic devices. It serves as an octal buffer variant within the broader family of high-performance digital integrated circuits. The device is functionally compatible with other 74 series types such as 74LVC and 74ALVC, ensuring interchangeability in many standard logic designs.

Replacement Considerations

The device is pin and function compatible with the 74 series 240 type, including variants from the 74LVC/ALVC families. Verify that any substitute maintains the same 5-V tolerant characteristics and low-voltage operational range to ensure circuit integrity.

FAQ

What is the function of the OE inputs?

The device has two active-low output enable (OE) inputs that control the three-state condition of the outputs. When OE is low, the buffers are enabled; when high, the outputs enter a high-impedance state.

How does the device handle power-down conditions?

All inputs and outputs are equipped with power-down protection circuits. This feature prevents excessive current from flowing through the inputs or outputs when the device is powered off.