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| PartNumber | 74ACT399PC | 74ACT399SC | 74ACT399MTCX |
| Description | Encoders, Decoders, Multiplexers & Demultiplexers Quad 2-Port Register | Encoders, Decoders, Multiplexers & Demultiplexers Quad 2-Port Register | Encoders, Decoders, Multiplexers & Demultiplexers Quad 2-Port Register |
| Manufacturer | ON Semiconductor | ON Semiconductor | ON Semiconductor |
| Product Category | Encoders, Decoders, Multiplexers & Demultiplexers | Encoders, Decoders, Multiplexers & Demultiplexers | Encoders, Decoders, Multiplexers & Demultiplexers |
| RoHS | Y | Y | Y |
| Product | Multiplexers | Multiplexers | Multiplexers |
| Logic Family | 74ACT | 74ACT | 74ACT |
| Number of Input Lines | 2 Input | 2 Input | 2 Input |
| Number of Output Lines | 4 Output | 4 Output | 4 Output |
| Propagation Delay Time | 9 ns at 5 V | 9 ns at 5 V | 9 ns at 5 V |
| Supply Voltage Min | 4.5 V | 4.5 V | 4.5 V |
| Supply Voltage Max | 5.5 V | 5.5 V | 5.5 V |
| Minimum Operating Temperature | - 40 C | - 40 C | - 40 C |
| Maximum Operating Temperature | + 85 C | + 85 C | + 85 C |
| Mounting Style | Through Hole | SMD/SMT | SMD/SMT |
| Package / Case | PDIP-16 | SOIC-16 | TSSOP-16 |
| Packaging | Tube | Tube | Reel |
| Function | Register | Register | Quad 2-Port Register |
| Height | 3.42 mm | 1.5 mm | 0.9 mm |
| Length | 19.68 mm | 10 mm | 5 mm |
| Number of Circuits | Quad | Quad | Quad |
| Technology | CMOS | CMOS | CMOS |
| Width | 6.6 mm | 4 mm | 4.4 mm |
| Brand | ON Semiconductor / Fairchild | ON Semiconductor / Fairchild | ON Semiconductor / Fairchild |
| Logic Type | 2-Port Register | 2-Port Register | 2-Port Register |
| High Level Output Current | - 24 mA | - 24 mA | - 24 mA |
| Low Level Output Current | 24 mA | 24 mA | 24 mA |
| Maximum Clock Frequency | 1500 MHz | 180 MHz | 1500 MHz |
| Operating Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| Product Type | Encoders, Decoders, Multiplexers & Demultiplexers | Encoders, Decoders, Multiplexers & Demultiplexers | Encoders, Decoders, Multiplexers & Demultiplexers |
| Factory Pack Quantity | 25 | 48 | 2500 |
| Subcategory | Logic ICs | Logic ICs | Logic ICs |
| Unit Weight | 0.057419 oz | 0.008536 oz | 0.006102 oz |