74LCX2244WM

Overview

The onsemi 74LCX2244WM is a low-voltage CMOS octal buffer with 3-state, non-inverting outputs and integrated 26Ω series resistors. It operates at VCC from 2.0V to 3.6V and features 5V-tolerant inputs and outputs. Propagation delay is 7.5ns max at 3.3V. Quiescent supply current is 10µA max. Output drive is ±12mA at 3.0V. Operating temperature range is -40°C to +85°C.

Feature Summary

• Integrates 26Ω series resistors in the output path to reduce overshoot and undershoot.
• Supports live insertion and withdrawal operations.
• Implements patented noise and EMI reduction circuitry.

Applications

• Memory address driver
• Clock driver
• Bus-oriented transmitter/receiver

Procurement Notes

Verify the specific package suffix (e.g., WM for SOIC) matches the required footprint. Confirm voltage tolerance requirements align with the 5V tolerant specification. Ensure OE pin biasing is designed correctly for power-down states. Check humidity sensitivity levels for storage and reflow profiles.

Selection Notes

Select this component when 5V interfacing is required within a low-voltage system. The integrated series resistors simplify PCB layout by reducing external components. Consider the 3-state capability for bus sharing applications. Verify that the propagation delay meets the timing constraints of the target clock or data lines.

Part Context

This device belongs to the LCX family of low-voltage logic devices. It is manufactured using advanced CMOS technology to balance high-speed operation with low power dissipation. The part is functionally similar to other octal buffers but distinguished by its integrated output resistance and 5V tolerance capabilities.

Replacement Considerations

Check datasheets for equivalent parts like the 74LCX244 if series resistors are not needed. Verify pin compatibility with existing designs. Ensure voltage levels and package dimensions match the original specifications.

FAQ

How does the device handle power-down conditions?

The device enters a high-impedance state during power down. To ensure this state, the OE input should be tied to VCC through a pull-up resistor sized according to the driver's current-sourcing capability.

What is the purpose of the internal 26Ω resistors?

The 26Ω series resistors are included in the outputs to help reduce output overshoot and undershoot, thereby improving signal integrity and reducing EMI.