The MAX3080–MAX3089 high-speed transceivers are devices for RS-485/RS-422 communication, consisting of one driver and one receiver. These devices feature fail-safe circuitry, which guarantees a logic-high receiver output when the receiver inputs are open or shorted. They also feature reduced slew-rate drivers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing error-free data transmission up to 115kbps. The different models of the devices have different driver output slew-rate limits, enabling transmit speeds up to 10Mbps. These transceivers typically draw 375µA of supply current when unloaded, or when fully loaded with the drivers disabled. All devices have a 1/8-unit-load receiver input impedance that allows up to 256 transceivers on the bus. The different models are intended for half-duplex or full-duplex communications, with the MAX3089 selectable between half-duplex and full-duplex operation and featuring independently programmable receiver and transmitter.
The MAX3080–MAX3089 family are high‑speed RS‑485/RS‑422 transceivers that combine a driver and a receiver in a single package. They feature fail‑safe circuitry, selectable slew‑rate options, and support both half‑ and full‑duplex operation. Different sub‑ranges provide data rates from 115 kbps up to 10 Mbps and include options for low‑power shutdown.
The document provides absolute maximum ratings, detailed DC and switching characteristics, pin descriptions, and typical application circuits. It also includes graphs of propagation delay, output waveforms, and temperature‑dependent performance, helping designers select the appropriate part and configure the device for their communication system.
| Data Rate (Mbps) | 115 kbps – 10 Mbps selectable (MAX3089) |
|---|---|
| Quiescent Supply Current (µA) | 375 µA typical (unloaded) |
| Supply Voltage (VCC) | +5 V ± 5 % (absolute max +7 V) |
| Receiver Input Impedance | 1/8‑unit‑load (supports up to 256 devices) |
In shutdown, the devices typically draw only 1 nA of supply current.
Use the Half/Full‑Duplex selector pin (H/F): connect H/F to VCC for half‑duplex, or to GND/leave unconnected for full‑duplex.
The SRL pin selects the slew‑rate: connect SRL to GND for 10 Mbps, to VCC for 500 kbps, or leave it unconnected for 115 kbps.