MAX1480A/MAX1480B/MAX1480C/MAX1490A/MAX1490B are complete, electrically isolated, RS-485/RS-422 data-communications interface solutions.
The Maxim MAX1480A/B/C and MAX1490A/B families provide complete, electrically isolated RS‑485/RS‑422 data‑communication interfaces in standard DIP packages. The devices combine transceivers, optocouplers and a transformer, and are powered by a single +5 V supply on the logic side.
These parts are offered in 28‑pin (MAX1480) and 24‑pin (MAX1490) DIP packages, support half‑duplex (MAX1480) or full‑duplex (MAX1490) operation, and feature short‑circuit current limiting with thermal shutdown. They are rated for up to 1600 VRMS (1 min) or 2000 VRMS (1 s) isolation and are suitable for industrial‑control LANs, test equipment and HVAC networks.
| Maximum data rate (A parts) | 2.5 Mbps |
|---|---|
| Maximum data rate (B/C parts) | 250 kbps |
| Package type (MAX1480) | 28‑pin DIP |
| Package type (MAX1490) | 24‑pin DIP |
| Operating temperature range | -40 °C to +85 °C |
| Supply voltage | +5 V |
| Driver slew‑rate | Reduced for B/C, unlimited for A |
| Communication mode | Half‑duplex (MAX1480) / Full‑duplex (MAX1490) |
The MAX1480A can operate at data rates up to 2.5 Mbps.
MAX1480 devices are offered in a 28‑pin DIP package, while MAX1490 devices use a 24‑pin DIP package.
Yes, the drivers are short‑circuit current limited and have thermal shutdown circuitry that places the outputs in a high‑impedance state.