MC74LCX541DTR2

Overview

The MC74LCX541DTR2G is a low-voltage CMOS octal buffer with flow-through pinout and 3-state non-inverting outputs. It operates from a 1.65 V to 5.5 V supply, featuring 5 V-tolerant inputs and outputs for direct interface with 5 V TTL logic. The device provides balanced 24 mA output sink and source capability at 3 V. Propagation delay ranges from 5.9 ns at 5.5 V to 10.3 ns at 1.65 V. It supports live insertion and withdrawal, includes an IOFF specification for high impedance when VCC = 0 V, and offers near-zero static supply current.

Feature Summary

• Flow-through architecture with input and output pins located on opposite sides of the package to facilitate PCB layout.
• 5 V tolerant I/O capability allowing safe interfacing between 1.65 V devices and 5 V systems.
• High-impedance state isolation via dual Output Enable (OE1, OE2) inputs to prevent bus contention.
• IOFF specification ensures zero output leakage during power-down mode to support hot-swapping applications.

Applications

• Memory address driving in portable electronic systems
• TTL level bus-oriented transceiver applications
• Live insertion and withdrawal circuitry
• Interface buffering between low-voltage controllers and 5 V peripherals

Procurement Notes

Verify the complete part number suffix, as 'DTR2' typically indicates TSSOP-20 packaging and tape-and-reel shipping. Confirm RoHS compliance status and check for automotive '-Q' variants if AEC-Q100 qualification is required. Ensure ordering documentation matches the specific voltage range and temperature grade needed for the target application environment.

Selection Notes

Select this component when a non-inverting octal buffer with flow-through pinout is required for space-constrained designs. It is suitable for applications needing 5 V tolerance on both inputs and outputs while operating at lower voltages down to 1.65 V. Consider the 24 mA drive strength for moderate load requirements and verify that the propagation delay specifications meet the system timing constraints across the intended supply voltage range.

Part Context

This device belongs to the MC74LCX series of low-voltage CMOS logic components manufactured by onsemi. It functions similarly to the MC74LCX244 but utilizes a flow-through pinout configuration. The series is designed for battery-powered and portable applications requiring low power consumption and compatibility with standard logic families.

Replacement Considerations

MC74LCX244DTG: Similar function but inverting polarity and different pinout. MC74LVC541ADTR2G: Different voltage range and drive characteristics. Verify pinout compatibility and electrical parameters before substitution.

FAQ

What is the purpose of the IOFF specification?

The IOFF specification guarantees that the outputs remain in a high-impedance state when the supply voltage (VCC) is 0 V, preventing back-powering of the device or interference with other components on the bus during power-down.

Can this device be used for live insertion?

Yes, the MC74LCX541 supports live insertion and withdrawal due to its 5 V tolerant inputs/outputs and the IOFF feature, which allows it to safely connect to active buses without causing signal conflicts or excessive current draw.