74LVC240APW/AUJ

Overview

The NXP USA Inc. 74LVC240APW/AUJ is an octal buffer and line driver featuring inverting logic with three-state outputs, housed in a TSSOP20 package (SOT360-1). It operates on a supply voltage range of 1.2 V to 3.6 V and supports overvoltage tolerant inputs up to 5.5 V. The device includes IOFF circuitry for partial power-down mode operation to prevent backflow current. It provides two independent output enables (1OE and 2OE), each controlling four outputs, allowing configuration as one 8-bit or two 4-bit buffers.

Feature Summary

• Features Schmitt-trigger action at all inputs to tolerate slower input rise and fall times.
• Includes IOFF circuitry that disables outputs during partial power-down to prevent potentially damaging backflow currents.
• Provides high-impedance OFF-states when the nOE input is HIGH.

Applications

• Translating signals between mixed 3.3 V and 5 V logic environments.
• Driving capacitive loads in bus-oriented architectures.
• Clock distribution and buffering in low-voltage digital systems.

Procurement Notes

Verify the specific suffix AUJ against the manufacturer's official ordering information to confirm the exact package variant and temperature rating. Ensure the procurement source provides documentation matching the Nexperia 74LVC240A datasheet Rev. 10. Confirm RoHS compliance status and check for any recent product status changes such as preliminary or objective data sheet classifications before finalizing orders.

Selection Notes

Select this component when designing circuits requiring bidirectional translation between 3.3 V and 5 V domains. The inclusion of IOFF functionality makes it suitable for applications where devices may be powered down while other system parts remain active. Verify that the required propagation delay and drive current specifications align with the target operating voltage within the 1.2 V to 3.6 V range.

Part Context

This part belongs to the 74LVC family of low-voltage CMOS logic devices manufactured by Nexperia. The LVC series is designed for high-speed operation with low power consumption, compatible with various TTL logic families. The 74LVC240A specifically serves as an octal buffer, distinct from non-inverting variants like the 74LVC244.

Replacement Considerations

Cross-reference with the standard 74LVC240A part number to ensure functional equivalence. Verify pinout compatibility and electrical characteristics against alternative manufacturers' octal buffer offerings if sourcing from different suppliers.

FAQ

How does the IOFF feature function?

The IOFF circuitry automatically disables the outputs when the device is powered down, preventing potentially damaging backflow current through the device.

Can this device interface directly with 5 V logic?

Yes, the inputs are overvoltage tolerant to 5.5 V, allowing direct interfacing with 5 V devices even when the device is powered at lower voltages.