74LCX244TTR

Overview

The 74LCX244TTR is a low voltage CMOS octal bus buffer with non-inverted, three-state outputs manufactured by STMicroelectronics. It utilizes sub-micron silicon gate and double-layer metal wiring C2MOS technology for high-speed operation at low power dissipation. The device supports an operating voltage range of 2.0V to 3.6V, with 1.5V data retention capability. It features 5V tolerant inputs and outputs, allowing direct interfacing with 5V signal environments. Key electrical specifications include a maximum propagation delay of 6.5ns at VCC = 3V, symmetrical output impedance with |IOH| = IOL = 24mA (min) at VCC = 3V, and balanced propagation delays where tPLH is approximately equal to tPHL.

Feature Summary

• Features 5V tolerant inputs and outputs for seamless interfacing with 5V signal environments while operating at low voltages.
• Provides high-speed performance with a maximum propagation delay of 6.5ns at VCC = 3V, matching the speed of 5V AC/ACT families.
• Includes power-down protection on inputs and outputs to maintain high impedance states during power-off conditions.
• Offers symmetrical output impedance with a minimum drive current of 24mA at VCC = 3V, ensuring PCI bus level guarantees.

Applications

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

Procurement Notes

Verify the specific package type and tape-and-reel configuration when ordering, as the TTR suffix indicates a TSSOP-20 tape and reel packaging format. Confirm that the design environment supports the specified 2.0V to 3.6V operating voltage range and 5V tolerance requirements. Ensure proper handling procedures are followed due to the moisture sensitivity inherent in CMOS logic devices.

Selection Notes

Select this component for designs requiring octal buffering with 5V compatibility in a low-voltage system. It is suitable for applications needing high-speed data transfer with low power consumption. Consider the TSSOP-20 package constraints and ensure the PCB layout accommodates the required thermal and electrical characteristics for reliable operation across the industrial temperature range.

Part Context

This part belongs to the 74LCX series of low-voltage CMOS logic devices from STMicroelectronics. The LCX family is designed to provide high-speed performance comparable to older 5V logic families while operating at lower supply voltages. The 74LCX244 specifically functions as an octal buffer, offering eight independent channels with three-state outputs for efficient bus management in digital systems.

Replacement Considerations

Direct pin-compatible replacements may be available from other manufacturers producing standard 74LCX244 parts. Verify that any substitute maintains the same 5V tolerance, propagation delay specifications, and package dimensions to ensure seamless integration without redesigning the circuit board or changing the bill of materials.