MC74HC244ADTG

Overview

The MC74HC244ADTG 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 utilizes a TSSOP-20 package and contains 136 FETs or 34 equivalent gates. Propagation delay ranges from 96 ns at 2.0 V down to 15 ns at 6.0 V. Maximum quiescent supply current is 160 µA at 6.0 V, with input leakage current limited to ±1.0 µA.

Feature Summary

• Octal 3-state noninverting buffer design with dual active-low output enables
• Compatible with standard CMOS outputs and LSTTL outputs when pullup resistors are used
• High noise immunity characteristic of CMOS devices
• Compliant with JEDEC Standard No. 7A requirements

Applications

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

Procurement Notes

Verify the specific ordering suffix 'DTG' corresponds to the TSSOP-20 package configuration as documented in the official datasheet. Confirm that the component meets RoHS compliance standards and is lead-free. Ensure the procurement matches the exact part number to guarantee correct pinout and electrical characteristics for the intended application.

Selection Notes

Select this component for applications requiring high-speed buffering with low power consumption. The wide operating voltage range supports various logic families. Verify that the TSSOP-20 package dimensions fit the PCB layout constraints. Consider the propagation delay specifications relative to the system clock speed to ensure signal integrity across the bus lines.

Part Context

This device belongs to the HC244A series of octal buffers. It serves as a noninverting version within the broader family of line drivers. The part shares pinout compatibility with LS244 equivalents, facilitating direct replacement in existing designs. It is designed for use in digital systems requiring multiple buffered outputs with tri-state control capabilities.

Replacement Considerations

The MC74HC244A is identical in pinout to the LS244. Designers may consider this equivalence when evaluating legacy circuit replacements. Ensure that the replacement maintains the required 3-state functionality and voltage levels compatible with the existing system architecture.