The MAX1487 RS485 Transceiver is a low-power half-duplex transceiver for RS-485 and RS-422 bus communication and is capable of data rates up to 2.5Mbs. The IC contains both a driver and receiver for the RS-485 bus together with protection against short-circuits and thermal overload. The MAX1487 also features a quarter-unit-load receiver input impedance, which allows up to 128 transceivers on the RS-485 bus.
Features
- Low Quiescent Current – 230µA
- -7V to +12V Common-Mode Input Voltage Range
- Three State Outputs
- 30ns Propagation Delay, 5ns Skew
- Operates from a Single 5V Supply
- Up to 128 Transceivers on the Bus
- Current Limiting and Thermal Shutdown for Driver Overload Protection
| Pin Number | Description |
|---|---|
| 1 | RO – Receiver Output |
| 2 | RE – Receiver Output Enable |
| 3 | DE – Driver Output Enable |
| 4 | DI – Driver Input |
| 5 | GND – Ground |
| 6 | A – Noninverting Receiver Input |
| 7 | B – Inverting Receiver Input |
| 8 | Vcc – +5V Power Supply |
Technical Specifications
| Physical | |
| Case/Package | PDIP |
| Contact Plating | Tin |
| Mount | Through Hole |
| Number of Pins | 8 |
| Technical | |
| Data Rate | 2.5 Mbps |
| Interface | RS-422, RS-485 |
| Logic Function | Transceiver |
| Max Operating Temperature | 70 °C |
| Max Power Dissipation | 727 mW |
| Max Supply Voltage | 5.25 V |
| Min Operating Temperature | 0 °C |
| Min Supply Voltage | 4.75 V |
| Nominal Supply Current | 500 µA |
| Number of Drivers | 1 |
| Number of Receivers | 1 |
| Number of Transceivers | 1 |
| Number of Transmitters | 1 |
| Operating Supply Voltage | 5 V |
| Packaging | Bulk |
| Simplex/Duplex | Half Duplex |
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