74LVC240AQ20-13

Overview

The Diodes Incorporated 74LVC240AQ20-13 is an octal buffer and line driver featuring two independent 4-bit channels with inverting logic and 3-state outputs. It operates within a supply voltage range of 1.65V to 3.6V, providing high drive capability by sourcing or sinking up to 24mA at VCC = 3V. The device utilizes a QFN-20 (V-QFN4525-20) surface-mount package. Inputs are tolerant to 5.5V, enabling compatibility with mixed-voltage environments. It includes dedicated I/OFF circuitry to prevent damaging backflow currents during partial power-down states.

Feature Summary

• Features Schmitt trigger action at all inputs for improved noise immunity and signal integrity.
• Includes IOFF circuitry that automatically disables outputs to prevent current backflow when the device is powered down.
• Provides robust ESD protection exceeding 2000-V Human Body Model and 1000-V Charged Device Model standards.
• Supports mixed-voltage applications through input tolerance up to 5.5V while operating on lower supply voltages.

Applications

• Bus driving
• Power down signal isolation
• General purpose logic

Procurement Notes

Verify the specific ordering suffix matches the required package configuration. Confirm that the QFN-20 variant aligns with the designated footprint dimensions and pad layout specifications provided in the manufacturer's suggested pad layout documentation. Ensure compliance with RoHS and halogen-free requirements if mandated by the project specifications.

Selection Notes

Select this component when an octal inverting buffer with 3-state control is required in a compact surface-mount form factor. The QFN-20 package offers a smaller footprint compared to TSSOP alternatives. Consider the 5.5V input tolerance for interfacing with higher voltage logic levels without additional level shifting components.

Part Context

This part belongs to the 74LVC240A series of octal buffers and line drivers manufactured by Diodes Incorporated. It is designed for low-voltage CMOS applications requiring high-speed performance and robust output drive capabilities. The series supports various packaging options to accommodate different board space constraints.

Replacement Considerations

Direct substitutes include the 74LVC240AT20-13, which shares identical electrical characteristics but utilizes a TSSOP-20 package instead of the QFN-20 configuration.

FAQ

How does the device handle partial power-down scenarios?

The device incorporates IOFF circuitry that detects power-down conditions and disables the outputs to prevent damaging current backflow from the bus into the unpowered device.

What is the maximum input voltage tolerance?

The inputs are tolerant to 5.5V, allowing the device to interface safely with 3.3V or 5V logic systems even when operating at lower supply voltages.