74ACTQ244SC

Buffers, Drivers, Receivers, Transceivers Overview

The 74ACTQ244SC is an octal buffer and line driver featuring 3-STATE outputs, housed in a 20-Lead Small Outline Integrated Circuit (SOIC) package. It operates within a supply voltage range of 4.5V to 5.5V. The device utilizes Quiet Series technology to ensure quiet output switching and improved dynamic threshold performance. Key electrical characteristics include outputs capable of sourcing and sinking 24 mA, with propagation delays typically ranging from 1.5 ns to 7.0 ns depending on load conditions. Input leakage current is limited to ±1.0 µA at maximum ratings.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Utilizes Fairchild Quiet Series technology for guaranteed quiet output switching and superior dynamic threshold performance.
• Features FACT Quiet Series capabilities including GTO output control and undershoot correction.
• Provides 3-STATE outputs suitable for driving bus lines or buffering memory address registers.
• Offers improved latch-up immunity and reduced quiescent supply current compared to standard AC/ACT devices.

Buffers, Drivers, Receivers, Transceivers Applications

• Memory address drivers
• Clock drivers
• Bus oriented transmitters or receivers

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering code suffix to confirm the package type, as the SC suffix denotes the 20-Lead SOIC variant. Ensure compatibility with the required operating temperature range of -40°C to +85°C. Confirm that the 4.5V to 5.5V supply voltage aligns with system power rails. Check for tape and reel availability if automated assembly is required by appending the X suffix to the base part number.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when high-density PCB layouts require octal buffering with controlled noise levels. The ACTQ variant is appropriate for 5V logic systems requiring faster propagation delays than standard AC series parts. Consider the 3-STATE functionality for bidirectional bus applications. Evaluate the package constraints against available board space, noting the SOIC footprint dimensions.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the 74ACQ/ACTQ Quiet Series family of octal buffers. It is manufactured by Fairchild Semiconductor, now part of onsemi. The part is designed to replace standard 74AC244 or 74ACT244 components where reduced simultaneous switching noise and improved dynamic thresholds are critical for signal integrity in high-speed digital circuits.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

Direct pin-compatible replacements include the 74ACQ244SC for AC series equivalents. Verify logic voltage levels, as the ACTQ variant requires 4.5V–5.5V operation, whereas the ACQ variant supports 2.0V–6.0V. Ensure substitute packages match the 20-Lead SOIC physical dimensions for proper mounting.