74ACT399SC

Signal Switches, Multiplexers, Decoders Overview

The Fairchild Semiconductor 74ACT399SC is a Quad 2-Port Register belonging to the 74ACT logic family. It integrates four independent multiplexers, each feeding an edge-triggered D-type flip-flop with three-state outputs. The device operates within a supply voltage range of 4.5V to 5.5V and features TTL-compatible inputs. It provides high-speed performance with a maximum propagation delay of 9ns at 5V with a 50pF load. The component supports output currents of 24mA for both high and low states, ensuring robust drive capability in bus-oriented applications.

Signal Switches, Multiplexers, Decoders Feature Summary

• Integrates quad 2-input multiplexers directly into edge-triggered flip-flops for efficient data routing and storage
• Features three-state outputs to facilitate direct connection to system buses without external buffering
• Provides TTL-compatible input levels for seamless interfacing with standard digital logic systems

Signal Switches, Multiplexers, Decoders Applications

• Bus-oriented data routing and storage systems
• Multiplexed register arrays for parallel data handling
• High-speed digital signal processing interfaces

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific suffix 'SC' corresponds to the SOIC-16 package variant when sourcing. Confirm RoHS compliance status as per current manufacturing revisions. Check part availability as legacy components may have limited stock or require substitution verification from authorized distributors.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when a combined multiplexer and register function is required in a single package. The ACT series offers faster switching speeds compared to standard 74LS equivalents while maintaining compatible pinouts. Ensure the design utilizes the three-state outputs effectively to manage bus contention.

Signal Switches, Multiplexers, Decoders Part Context

This component is part of the 74ACT series, designed for high-speed CMOS applications. It serves as a logical equivalent to discrete multiplexer and flip-flop combinations, reducing board space and interconnect complexity. The device is manufactured by Fairchild Semiconductor, now part of onsemi.

Signal Switches, Multiplexers, Decoders FAQ

What is the logical structure of the 74ACT399SC?

It consists of four independent 2-to-1 multiplexers, where each multiplexer output feeds the data input of a positive-edge-triggered D-type flip-flop.

How are the outputs controlled?

The outputs are three-state, controlled by a common Output Enable (OE) pin that allows the registers to be disconnected from the bus when not active.