MC74HC244ADT

Overview

The MC74HC244ADT is an octal 3-state noninverting buffer and line driver manufactured by onsemi. It operates within a supply voltage range of 2.0 V to 6.0 V and features two active-low output enables. The device provides high noise immunity and low input current, with outputs directly interfacing to CMOS, NMOS, and TTL loads. It contains 136 FETs or 34 equivalent gates and is housed in a TSSOP-20 package.

Feature Summary

• Octal 3-state noninverting buffer design
• Direct interface capability for CMOS, NMOS, and TTL
• High noise immunity characteristic of CMOS devices

Applications

• 3-state memory address drivers
• Clock drivers
• Bus-oriented systems

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and shipping configuration. Ensure the selected variant matches the required operating temperature range and voltage specifications for the target application environment.

Selection Notes

Select this component when an octal buffer with 3-state control is required for bus-oriented architectures. The HC series offers a wide voltage range suitable for various logic families. Verify that the TSSOP-20 package dimensions align with the PCB layout constraints.

Part Context

This part belongs to the MC74HC244A family of octal buffers. It serves as a noninverting version of the HC240A/HCT240A series. The device is designed to replace LS244 equivalents while providing improved performance characteristics typical of High-Speed CMOS technology.

Replacement Considerations

The datasheet notes pinout compatibility with the LS244. Designers should verify electrical parameters such as propagation delay and drive strength when substituting other octal 3-state buffers.