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| PartNumber | XR68C681JTR-F | XR68C681 | XR68C681CJ |
| Description | UART Interface IC Dual Channel UART | UART, 44 Pin, Plastic, PLCC | |
| Manufacturer | Exar Corporation | XR | XR |
| Product Category | Interface - UARTs (Universal Asynchronous Receiver Transmitter) | Interface - UARTs (Universal Asynchronous Receiver Transmitter) | Interface - UARTs (Universal Asynchronous Receiver Transmitter) |
| Series | XR68C681 | - | - |
| Packaging | Tape & Reel (TR) Alternate Packaging | - | - |
| Unit Weight | 0.084185 oz | - | - |
| Mounting Style | SMD/SMT | - | - |
| Package Case | PLCC-44 | - | - |
| Mounting Type | Surface Mount | - | - |
| Features | Internal Oscillator, Timer/Counter | - | - |
| Number of Channels | 2, DUART | - | - |
| Voltage Supply | 5V | - | - |
| Supplier Device Package | 44-PLCC (16.59x16.59) | - | - |
| Memory Size | 1 B 3 B | - | - |
| Protocol | - | - | - |
| Data Rate Max | 1Mbps | - | - |
| With Auto Flow Control | - | - | - |
| With IrDA Encoder Decoder | - | - | - |
| With False Start Bit Detection | - | - | - |
| With Modem Control | - | - | - |