This document describes the features of ADM3483/ADM3485/ADM3488/ADM3490/ADM3491 3.3V slew rate limited, half- and full-duplex RS-485/RS-422 transceivers. These transceivers are interoperable with 5V logic, compliant with EIA RS-422 and RS-485 standards over full common-mode range, offer multiple data rate options, reduced slew rates for low EMI, low power shutdown mode, support up to 32 transceivers on the bus, and more. They are suitable for low power RS-485/RS-422 applications, telecom, industrial process control, HVAC, and other fields.
The ADM3483/ADM3485/ADM3488/ADM3490/ADM3491 family are low‑power, differential line transceivers that operate from a single 3.3 V supply. They support half‑duplex (ADM3483, ADM3485) or full‑duplex (ADM3488, ADM3490, ADM3491) communication and are suited for power‑sensitive applications such as industrial process control, HVAC, and telecom.
Key specifications include data‑rate options of 250 kbps for the ADM3483/ADM3488 and 10 Mbps for the ADM3485/ADM3490/ADM3491, up to 32 transceivers on a single bus, a shutdown current as low as 0.002 pA, and operation over a –40 °C to +85 °C temperature range. The devices are offered in 8‑lead SOIC packages, with the ADM3491 also available in a 14‑lead SOIC package.
| Supply Voltage | 3.3 V |
|---|---|
| Data Rate (ADM3483/ADM3488) | 250 kbps |
| Data Rate (ADM3485/ADM3490/ADM3491) | 10 Mbps |
| Maximum Bus Load | 32 transceivers |
| Shutdown Mode Current | 0.002 pA |
| Input Impedance | 12 kΩ |
| Operating Temperature Range | -40 °C to +85 °C |
| Package Types | 8‑lead SOIC (all), 14‑lead SOIC (ADM3491 only) |
The ADM3485 supports a data rate of up to 10 Mbps.
Up to 32 transceivers can be connected on the bus.
They operate from a 3.3 V supply.
In shutdown mode the devices draw as little as 0.002 pA.