The MAX3140 is a complete universal asynchronous receiver-transmitter (UART) and a true fail-safe RS- 485/RS-422 transceiver combined in a single 28-pin QSOP package for space-, cost-, and power-con- strained applications.
The MAX3140 is a complete universal asynchronous receiver‑transmitter (UART) and a true fail‑safe RS‑485/RS‑422 transceiver combined in a single 28‑pin QSOP package. It features an SPI/MICROWIRE‑compatible serial interface, pin‑programmable RS‑485/RS‑422 options, and integrated UART functions.
The device supports selectable half‑ or full‑duplex operation, data rates up to 115 kbps, 500 kbps, and 10 Mbps, and can address up to 256 transceivers on a bus. It operates from a single +5 V supply, typically draws 645 µA with the receiver active, and can be shut down to a current of only 20 µA, making it suitable for space‑constrained, cost‑sensitive applications.
| Supply Voltage | +5 V |
|---|---|
| Maximum Data Rate | 115 kbps, 500 kbps, 10 Mbps |
| Receiver Input Impedance | 1/8‑unit‑load |
| Typical Supply Current (receiver active) | 645 µA |
| Shutdown Current | 20 µA |
| Package | 28‑pin QSOP |
| Operating Temperature Range | -40 °C to +85 °C (MAX3140EEI), 0 °C to +70 °C (MAX3140CEI) |
The MAX3140 can operate at up to 115 kbps, 500 kbps, or 10 Mbps depending on the selected mode.
It typically consumes about 645 µA with the receiver active.
The device allows up to 256 transceivers on the bus.
In shutdown mode the current is reduced to about 20 µA.