The MAX1480A/MAX1480B/MAX1480C/MAX1490A/MAX1490B are complete, electrically isolated, RS-485/RS-422 data-communications interface solutions in a hybrid microcircuit.
The MAX1480A/B/C and MAX1490A/B families provide complete, electrically isolated RS‑485/RS‑422 data‑communication interfaces in standard DIP packages. They operate from a single +5 V supply and include transceivers, optocouplers, and an isolation transformer. The MAX1480 devices support half‑duplex communication, while the MAX1490 devices support full‑duplex operation.
Key features include high isolation voltage (up to 2000 V RMS), selectable data rates (up to 2.5 Mbps for MAX1480A/MAX1490A and up to 250 kbps for the slew‑rate‑limited parts), and robust protection against short‑circuit and over‑temperature conditions. The devices are offered in 28‑pin DIP (MAX1480) and 24‑pin DIP (MAX1490) packages and are suited for industrial‑control networks, HVAC, and test equipment.
| Maximum data rate (A parts) | 2.5 Mbps |
|---|---|
| Maximum data rate (B/C parts) | 250 kbps |
| Package (MAX1480) | 28‑pin DIP |
| Package (MAX1490) | 24‑pin DIP |
| Isolation voltage rating | 1600 V RMS (1 min) / 2000 V RMS (1 s) |
| Duplex mode | MAX1480 – half‑duplex; MAX1490 – full‑duplex |
The MAX1480A supports 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.
They can typically withstand 1600 V RMS for 1 minute or 2000 V RMS for 1 second.
The MAX1480 family is half‑duplex; the MAX1490 family is full‑duplex.