74LCX2244WMX

Overview

The onsemi 74LCX2244WMX is a low-voltage CMOS octal buffer and line driver featuring 3-state outputs. It operates within a supply voltage range of 2.0V to 3.6V, with specific specifications provided for 2.3V to 3.6V applications. The device incorporates 26Ω series resistors in the output paths to reduce overshoot and undershoot. It supports live insertion and withdrawal capabilities while maintaining high-speed operation with a maximum propagation delay of 7.5ns at 3.3V. The component provides ±12mA output drive capability at 3.0V and exhibits low quiescent current.

Feature Summary

• Features integrated 26Ω series resistors in the output lines to minimize signal overshoot and undershoot.
• Provides 5V tolerant inputs and outputs, enabling safe interfacing between low-voltage logic and 5V signal environments.
• Supports live insertion and withdrawal operations through power-down high-impedance input and output states.
• Implements patented noise and EMI reduction circuitry to enhance signal integrity during switching.

Applications

• Memory address drivers
• Clock drivers
• Bus-oriented transmitter/receiver circuits

Procurement Notes

Verify that the ordering code includes the 'X' suffix to confirm tape and reel packaging availability. Confirm the manufacturer origin, as this part was originally produced by Fairchild Semiconductor before acquisition. Ensure the datasheet version matches the required electrical characteristics for your specific voltage operating point.

Selection Notes

Select this component when 5V tolerance is required alongside low-voltage operation. The internal 26Ω resistors are critical for applications demanding controlled edge rates without external components. Verify that the SOIC-20 package fits the board layout constraints compared to other available packages like TSSOP or DQFN.

Part Context

This device belongs to the LCX family of low-voltage CMOS logic devices. It serves as an octal buffer variant within the broader 74LCX product line, distinguished by the addition of series output resistors found in the standard 74LCX244. It is designed for portable and battery-powered applications requiring high speed and low power consumption.

Replacement Considerations

Direct substitutes include the 74LCX244, which lacks the internal series resistors. Other compatible buffers from the same family may be used if the overshoot suppression provided by the 26Ω resistors is not required for the specific application design.

FAQ

How does the device handle high-impedance states during power-up?

To ensure the high-impedance state during power up or down, the OE (Output Enable) pin should be tied to VCC through a pull-up resistor.

What is the purpose of the 26Ω resistors in the outputs?

The 26Ω series resistors help reduce output overshoot and undershoot, improving signal integrity and supporting live insertion/withdrawal.