The MAX3483/3485/3486/3488/3490/3491 are 3.3V, low-power RS-485/RS-422 transceivers. The device features include operation from a single 3.3V supply and compatibility with +5V logic.
The MAX3483‑MAX3491 family are low‑power, 3.3 V RS‑485/RS‑422 transceivers offering both half‑duplex and full‑duplex options. Certain parts feature slew‑rate‑limited drivers to reduce EMI and reflections, while others provide higher data‑rate capabilities up to 10 Mbps. The devices include driver current‑limiting, thermal shutdown, and a fail‑safe receiver that guarantees a logic‑high output when inputs are open.
These transceivers are intended for industrial‑control LANs, telecommunications, and other EMI‑sensitive applications. The document provides absolute maximum ratings, detailed electrical characteristics, driver and receiver switching parameters, pin descriptions, package dimensions, and ordering information for each part number.
| Supply Voltage | 3.3 V (single supply) |
|---|---|
| Maximum Data Rate (MAX3485/MAX3490/MAX3491) | 10 Mbps |
| Maximum Data Rate (MAX3486) | 2.5 Mbps |
| Common‑Mode Input Voltage Range | -7 V to +12 V |
| Maximum Number of Transceivers on Bus | 32 |
| Shutdown Current (Low‑Current Mode) | 2 nA |
The MAX3486 can transmit at up to 2.5 Mbps.
Up to 32 transceivers can be connected on the bus.
They operate from a single 3.3 V supply.
The common‑mode input voltage range is –7 V to +12 V.