The MAX1480EA/MAX1480EC/MAX1490EA/MAX1490EB are complete, electrically isolated, RS-485/RS-422 data communications interface solutions
The MAX1480EA/MAX1480EC and MAX1490EA/MAX1490EB are electrically isolated RS‑485/RS‑422 data‑communication interface solutions offered in standard DIP packages. They provide ±15 kV ESD protection on I/O pins, a single +5 V supply for both sides, and driver features such as short‑circuit current limiting and thermal shutdown.
The devices support half‑duplex communication (MAX1480) or full‑duplex communication (MAX1490), with driver slew‑rate options that enable up to 2.5 Mbps (unlimited‑slew) or 160 kbps (reduced‑slew) data rates. They are rated for isolation voltages of 1260 V RMS (1 min) or 1520 V RMS (1 s) and operate over a temperature range from –40 °C to +85 °C.
| Isolation Voltage | 1260 V RMS (1 min) / 1520 V RMS (1 s) |
|---|---|
| ESD Protection | ±15 kV on I/O pins |
| Maximum Data Rate (unlimited‑slew) | 2.5 Mbps |
| Maximum Data Rate (reduced‑slew) | 160 kbps |
| Supply Voltage | +5 V ±10 % |
| Package Type | 28‑pin DIP (MAX1480) / 24‑pin DIP (MAX1490) |
| Driver Protection | Short‑circuit current limited, thermal shutdown |
| Receiver Fail‑Safe Output | RO low for MAX1480, RO high for MAX1490 |
They are rated to withstand 1260 V RMS for 1 minute or 1520 V RMS for 1 second.
The unlimited‑slew versions support data rates up to 2.5 Mbps.
Drivers are short‑circuit current limited and include thermal shutdown circuitry.
A single +5 V supply (±10 %) powers both the logic and isolated sides.