74LVC540AQ20-13

Overview

The Diodes Incorporated 74LVC540AQ20-13 is an octal inverting buffer and line driver featuring three-state outputs, designed for bus driving and memory address register buffering. It operates within a supply voltage range of 1.65V to 3.6V and supports partial power down applications via dedicated I_OFF circuitry that prevents damaging backflow currents. The device incorporates Schmitt trigger action at all inputs and provides robust ESD protection exceeding 2000-V Human Body Model standards. Packaged in a V-QFN4525-20 format with inputs and outputs on opposite sides to facilitate PCB layout.

Feature Summary

• Features two active-low output enable inputs (OE1, OE2) configured as a 2-input AND gate to control the high-impedance state of all eight outputs.
• Includes integrated I_OFF circuitry specifically designed to disable outputs and prevent current backflow during partial power down scenarios.
• Inputs are tolerant to 5.5V, enabling direct interfacing with 3.3V or 5V logic systems in mixed-voltage environments.

Applications

• Bus driving
• Memory address register buffering
• Power down signal isolation

Procurement Notes

Verify the Q20 package code corresponds to the V-QFN4525-20 form factor when sourcing. Confirm RoHS compliance and Halogen-free status requirements against specific project constraints. Ensure input pins are tied to VCC or ground if unused to maintain stable operation. Validate thermal resistance parameters against system cooling capabilities.

Selection Notes

Select this component for designs requiring low-power CMOS performance with mixed-voltage compatibility. The V-QFN4525-20 package offers a compact footprint suitable for space-constrained layouts. Verify that the 1.65V to 3.6V operating range aligns with the target system's power supply rails. Consider the 24mA sink/source capability for driving standard bus loads.

Part Context

This part belongs to the 74LVC540A series of octal buffers and line drivers manufactured by Diodes Incorporated. It is part of the broader LVC family, which emphasizes low-voltage operation and high-speed performance. The 'Q20' suffix designates the specific V-QFN4525-20 surface-mount package variant.

Replacement Considerations

Cross-reference with other manufacturers offering equivalent 74LVC540A specifications. Verify pinout compatibility and electrical characteristics such as propagation delay and output drive strength before substitution.

FAQ

How does the device handle partial power down conditions?

The device features I_OFF circuitry that disables the outputs to prevent damaging current backflow when the device is powered down while the system remains active.

What is the function of the OE1 and OE2 pins?

OE1 and OE2 serve as active-low output enable inputs. They function as a 2-input AND gate; if either input is high, all eight outputs enter a high-impedance state.