MAX3291/MAX3292 RS-485/RS-422 transceivers with preemphasis for high-speed, long-distance communication
The MAX3291 and MAX3292 are high‑speed RS‑485/RS‑422 transceivers that feature driver pre‑emphasis circuitry to extend communication distance and increase data rates by reducing intersymbol interference. Both devices operate from a single +5 V supply, support full‑duplex operation, and include a low‑current shutdown mode.
Key specifications include programmable data rates (5 Mbps‑10 Mbps for MAX3291, up to 10 Mbps for MAX3292), a 1/4‑unit‑load receiver input that permits up to 128 devices on a bus, a common‑mode input range of –7 V to +12 V, and short‑circuit current limiting on the driver outputs. The datasheet provides detailed pin descriptions, electrical ratings, and typical performance graphs.
| Data rate (MAX3291) | 5 Mbps to 10 Mbps |
|---|---|
| Data rate (MAX3292) | up to 10 Mbps |
| Supply voltage | +5 V (typical) |
| Low‑current shutdown current | 100 nA |
| Receiver input impedance | 1/4‑unit load, supports up to 128 transceivers |
| Common‑mode input voltage range | -7 V to +12 V |
It extends the communication distance and increases the data rate by reducing intersymbol interference caused by long cables.
Up to 128 transceivers can be connected because the receiver input is a 1/4‑unit load.
Drive the RE pin high and the DE pin low to enter the low‑power shutdown mode.