74ACT399PC

Signal Switches, Multiplexers, Decoders Overview

The onsemi 74ACT399PC is a Quad 2-Port Register housed in a 16-Lead Plastic Dual-In-Line (PDIP) package. It functions as four edge-triggered D-type flip-flops fed by a common Select input that chooses between two 4-bit data sources. The device operates within a supply voltage range of 4.5V to 5.5V and supports an operating temperature from -40°C to +85°C. Key electrical parameters include a maximum propagation delay of 8.5ns at 5.5V, output current capability of ±24mA, and TTL-compatible inputs.

Signal Switches, Multiplexers, Decoders Feature Summary

• Selects four bits of data from either of two sources under control of a common Select input
• Fully positive edge-triggered operation with synchronous transfer to the 4-bit output register
• Outputs capable of sourcing and sinking 24 mA
• Features TTL-compatible inputs for direct interfacing

Signal Switches, Multiplexers, Decoders Applications

• Data routing between two sources to a single destination
• Synchronous data storage in digital systems
• Multiplexing applications requiring edge-triggered latching

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific ordering code suffix against the manufacturer's documentation to confirm the package type and tape/reel availability. Ensure the procurement channel provides valid traceability for the component. Confirm that the received part matches the 74ACT399PC designation and PDIP-16 physical dimensions before integration into the design.

Signal Switches, Multiplexers, Decoders Selection Notes

Choose this component when a quad 2-port register with high-speed edge-triggered operation is required. The ACT series offers faster switching speeds compared to AC variants while maintaining CMOS power efficiency. Verify that the system clock frequency remains within the specified limits for the chosen supply voltage and load capacitance conditions.

Signal Switches, Multiplexers, Decoders Part Context

This component belongs to the 74ACT logic family, which combines the speed of bipolar circuits with the low power consumption of CMOS technology. The 74ACT399 specifically implements a multiplexer-register architecture, distinguishing it from standard shift registers or simple latches by providing dual-input selection capabilities within a single integrated circuit package.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Check datasheets for other 74ACT399 variants from different manufacturers to ensure pinout and electrical characteristic compatibility. Verify that any substitute maintains the same PDIP-16 package dimensions and meets the 4.5V to 5.5V operating voltage requirements.