74ACT399SCX

Signal Switches, Multiplexers, Decoders Overview

The Fairchild Semiconductor 74ACT399SCX is a high-speed CMOS logic device belonging to the ACT series. It functions as a quad 2-port register, logically equivalent to four 2-input multiplexers feeding into edge-triggered D flip-flops. The component features buffered positive-edge triggered clocks and true outputs. It operates on a single supply voltage ranging from 4.5V to 5.5V. The device supports output currents of 24mA for both high and low states. It is housed in a 16-lead Small Outline (SOIC) package.

Signal Switches, Multiplexers, Decoders Feature Summary

• Quad 2-port register architecture combining multiplexing and storage
• Buffered positive edge-triggered clock inputs
• High-speed CMOS technology with TTL-compatible inputs
• True outputs capable of sourcing and sinking 24mA

Signal Switches, Multiplexers, Decoders Applications

• Bus-oriented data routing and selection
• Digital signal path control in communication systems
• Data acquisition systems requiring multiplexed input registration
• Logic interface circuits between different voltage domains

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific manufacturer source, as ON Semiconductor acquired Fairchild's logic business. Ensure the datasheet corresponds to the ACT series specifications rather than AC or HC variants. Confirm the SOIC-16 package dimensions match your PCB footprint requirements. Check RoHS compliance status for the specific production batch. Validate that the part number suffix indicates the correct tape-and-reel packaging if applicable.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when a combined multiplexer and register function is required in a compact form factor. The ACT series offers faster switching speeds compared to standard 74LS devices while maintaining similar power consumption profiles. Consider the 24mA drive capability for direct interfacing with loads without additional buffering. Ensure the operating temperature range meets the environmental conditions of the target application.

Signal Switches, Multiplexers, Decoders Part Context

The 74ACT399 is part of the broader 74ACT family of high-speed CMOS logic ICs. This family is designed to replace slower TTL logic with higher performance and lower power. The 74ACT399 specifically addresses applications needing simultaneous signal selection and latching. It is often used in conjunction with other 74ACT components like bus drivers and decoders to build complex digital systems.

Signal Switches, Multiplexers, Decoders Replacement Considerations

The 74ACT399PC is a pin-compatible DIP-16 version of the same logical function. The 74AC399SCX is an AC series variant with potentially different speed and power characteristics but identical pinout. Verify electrical parameters such as propagation delay and output current when substituting with these alternatives.