The ADM3493 is a 3.3V Slew Rate Limited, Half Duplex RS-485/RS-422 Transceiver. It operates with low power consumption and reduced electromagnetic interference, making it suitable for low power RS-485 applications and EMI sensitive systems.
The ADM3493 is a low‑power, half‑duplex RS‑485/RS‑422 transceiver that operates from a single 3.3 V supply. It features reduced EMI through slew‑rate limiting, a shutdown mode drawing only a few picoamps, and can support up to 256 devices on a common bus.
The document includes detailed electrical specifications, timing diagrams, pin descriptions, absolute maximum ratings, and typical application circuits, along with ordering information for the 8‑lead SOIC package.
| Supply Voltage | 3.3 V ±0.3 V |
|---|---|
| Supply Current (normal operation) | 1.1–2.2 mA |
| Supply Current (shutdown mode) | 0.002–1 pA |
| Differential Output Voltage (RS‑422) | 2.0 V |
| Common‑Mode Output Voltage | 3 V |
| CMOS Input Logic Low Threshold | 0.8 V |
| Maximum Bus Transceivers | 256 |
| Operating Temperature Range | –40 °C to +85 °C |
| Package | 8‑lead SOIC |
The ADM3493 supports up to 256 transceivers on a single bus.
In shutdown mode the device draws between 0.002 pA and 1 pA.
It operates from a 3.3 V supply with a ±0.3 V tolerance.
The device is specified for operation from –40 °C to +85 °C.