QS74FCT240ATZ

Buffers, Drivers, Receivers, Transceivers Overview

The QS74FCT240ATZ is a high-speed CMOS octal buffer and line driver manufactured by Quality Semiconductor. It features two independent four-bit drivers with inverted outputs and three-state control. The device operates within a supply voltage range of 4.5V to 5.5V, ensuring compatibility with standard 5V logic systems. It utilizes a 20-pin Plastic ZIIP (PZIP) package, designed for through-hole mounting on printed circuit boards. Key electrical characteristics include a maximum propagation delay of 8ns at nominal supply voltage and a low-level output current capability of 48mA, suitable for driving moderate capacitive loads.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Provides dual four-bit buffering with inverted logic functionality
• Features three-state outputs for bus-oriented memory and clock driving applications
• Operates reliably across the full industrial temperature range

Buffers, Drivers, Receivers, Transceivers Applications

• Bus-oriented memory and register structures
• Clock driver circuits
• Buffering high-capacitance or low-impedance loads

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific manufacturer designation, as Quality Semiconductor assets were acquired by Integrated Device Technology (IDT). Ensure the component matches the original Quality Semiconductor specifications rather than subsequent IDT revisions. Confirm the PZIP-20 package type and lead finish requirements against current inventory standards before integration into production designs.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when a through-hole compatible octal buffer with strong drive capability is required. The 48mA low-level sink current supports direct interfacing with heavier loads compared to standard FCT devices. Consider the 8ns propagation delay for timing-critical paths where moderate speed is sufficient without the power consumption of faster families.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the FCT (Fast CMOS) logic family, bridging the performance gap between standard TTL and advanced CMOS technologies. The QS prefix identifies it as an original Quality Semiconductor product, now often cross-referenced under IDT branding following corporate acquisitions. It serves as a robust solution for legacy system maintenance and mixed-technology board designs requiring reliable 5V operation.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

QS74FCT240ATZ

Buffers, Drivers, Receivers, Transceivers FAQ

What is the maximum low-level output current?

The device provides a maximum low-level output current of 48mA.

Does the device support bidirectional data transfer?

No, the QS74FCT240ATZ is a unidirectional buffer/driver; bidirectional functions require a transceiver variant such as the 244 series.