MC74HCT244AFR2

Overview

The MC74HCT244AFR2 is an octal 3-state non-inverting buffer and line driver from the 74HCT logic family. It features eight inputs and eight outputs, operating within a supply voltage range of 4.5 V to 5.5 V. The device provides high-level output current of -8 mA and low-level output current of 8 mA at 5 V. It exhibits a typical propagation delay of 28 ns at 5 V with a capacitive load of 50 pF. The static supply current is typically 4 µA, while the maximum operating supply current is 160 µA. It functions reliably across a temperature range of -55 °C to +125 °C.

Feature Summary

• Provides octal buffering with three-state output control for bus-oriented architectures
• Compatible with TTL voltage levels due to HCT logic design
• Identical pinout to LS244 for direct replacement in existing designs

Applications

• Bus-oriented systems requiring signal isolation
• Memory address drivers
• Clock drivers

Procurement Notes

Verify the FR2 suffix indicates tape-and-reel packaging when ordering. Confirm the specific temperature grade and package variant match the design requirements. Cross-reference the datasheet revision date to ensure compliance with current electrical specifications. Ensure ESD handling procedures are followed during assembly.

Selection Notes

Select this component for applications requiring CMOS performance with TTL compatibility. The wide operating temperature range supports industrial environments. Verify that the 3-state outputs meet the system's bus loading requirements. Consider the SOIC-20 package constraints for PCB layout.

Part Context

This part belongs to the 74HCT series of advanced CMOS logic devices. It serves as a standard octal buffer within onsemi's logic portfolio. The device is designed to interface between different logic families while maintaining signal integrity. It is widely used in digital communication and data transmission circuits.

Replacement Considerations

The MC74HCT244A offers identical pinout to the SN74LS244. Other manufacturers' 74HCT244 variants may be compatible if electrical parameters align.