MC74HC244ADTR2

Overview

The MC74HC244ADTR2 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, low input current, and drive capability for 15 LSTTL loads. It is housed in a TSSOP-20 package with a maximum propagation delay of 18 ns at 4.5 V.

Feature Summary

• Octal 3-state noninverting buffer design
• Active-low output enable controls
• High noise immunity CMOS characteristics

Applications

• Memory address drivers
• Clock drivers
• Bus-oriented systems

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and shipping quantity. Confirm RoHS compliance status and lead-free material composition requirements prior to procurement. Ensure the selected variant matches the required operating temperature range and voltage specifications for the target application.

Selection Notes

Select this component for applications requiring octal buffering with 3-state control. Verify compatibility with standard CMOS or LSTTL outputs using pullup resistors if necessary. Consider the operating voltage range and propagation delay requirements when designing bus-oriented systems or clock distribution networks.

Part Context

This part belongs to the MC74HC244A family of octal buffers. It shares pinout compatibility with LS244 devices. The HC series offers wider voltage operation compared to HCT variants. It is designed for general-purpose digital logic buffering and line driving tasks.

Replacement Considerations

MC74HC244ADTG (TSSOP-20 Rail)

FAQ

What is the function of the Enable A and Enable B pins?

These are active-low output enables. When low, outputs are enabled; when high, outputs enter a high-impedance state.

How does the MC74HC244A interface with LSTTL outputs?

With pullup resistors, its inputs are compatible with LSTTL outputs.