74ACQ240SJ

Buffers, Drivers, Receivers, Transceivers Overview

The onsemi 74ACQ240SJ is an inverting octal buffer and line driver featuring 3-STATE outputs, manufactured using Fairchild’s Quiet Series technology. It operates within a supply voltage range of 2.0V to 6.0V and supports an operating temperature from -40°C to +85°C. The device provides symmetrical output impedance with source/sink currents of 24 mA. Propagation delays are guaranteed at 10.5 ns maximum at 3.3V and 7.0 ns maximum at 5.0V. Quiescent supply current is limited to 40 µA, while dynamic threshold performance ensures reduced simultaneous switching noise.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Utilizes Quiet Series technology for improved dynamic threshold performance and guaranteed quiet output switching.
• Features GTO output control and undershoot correction mechanisms alongside a split ground bus design.
• Provides inverting 3-STATE outputs capable of driving bus lines or buffering memory address registers.
• Guarantees pin-to-pin skew AC performance and enhanced latch-up immunity.

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 'SJ' corresponds to the 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide. Confirm that the required logic family matches the AC specifications rather than ACT, as electrical characteristics differ significantly between the two variants. Ensure the application environment remains within the specified -40°C to +85°C operating temperature range and 2.0V to 6.0V supply voltage limits.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when high-density PC board designs require improved noise immunity and reduced power dissipation compared to standard logic families. The device is suitable for applications demanding faster propagation delays than standard ACT240 devices while maintaining strict simultaneous switching noise levels. Consider the SOP package constraints if space is limited but through-hole PDIP options are not viable.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the 74ACQ/ACTQ240 Quiet Series family of octal buffers and line drivers. It shares functional compatibility with the standard 74AC240 series but incorporates specific FACT Quiet Series enhancements. The manufacturer is identified as Fairchild Semiconductor Corporation in the provided datasheet documentation.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

The 74ACQ240SC serves as a pin-compatible alternative utilizing the SOIC package instead of the SOP variant. Verify that any replacement maintains the same logic family (AC vs ACT) and package width specifications to ensure mechanical fit and electrical performance alignment.

Buffers, Drivers, Receivers, Transceivers FAQ

What distinguishes the ACQ240 from the ACTQ240 regarding input thresholds?

The ACQ240 utilizes CMOS-compatible input thresholds defined by percentages of VCC (e.g., 30% to 70%), whereas the ACTQ240 uses TTL-compatible fixed voltage thresholds (e.g., 2.0V for HIGH, 0.8V for LOW).

How does the device manage simultaneous switching noise?

The device employs FACT Quiet Series technology, which includes GTO output control and undershoot correction, to guarantee specific dynamic threshold performance and limit simultaneous switching noise levels.