The MAX3430 fault-protected RS-485 transceiver features ±80V protection from overvoltage signal faults on communication bus lines. Each device contains one driver and one receiver, and the output pins can withstand faults, with respect to ground, of up to ±80V. Even if the faults occur when the transceiver is active, shut down, or powered off, the device will not be damaged. The MAX3430 operates from a 3.3V supply and features a slew-rate-limited driver that minimizes EMI and reduces reflections caused by improperly terminated cables, allowing error-free data transmission at data rates up to 250kbps. The MAX3430 has a 1/4-unit-load receiver input impedance allowing up to 128 transceivers on a single bus and features fail-safe circuitry, which guarantees a logic-high receiver output when the receiver inputs are open. Hot-swap circuitry eliminates false transitions on the data cable during circuit initialization or connection to a live backplane. Short-circuit current limiting and thermal-shutdown circuitry protect the driver against excessive power dissipation. The MAX3430 is available in 8-pin SO and 8-pin PDIP packages, and is specified over commercial and industrial temperature ranges.
The MAX3430 is a fault‑protected RS‑485 transceiver that operates from a 3.3 V supply and features a slew‑rate‑limited driver to minimize EMI. It provides ±80 V over‑voltage protection, true fail‑safe inputs, hot‑swap capability, and can support data rates up to 250 kbps. The device’s 1/4‑unit‑load receiver input impedance allows up to 128 transceivers on a single bus.
Typical applications include industrial‑control networks, LANs, Profibus, and multimaster RS‑485 systems. The part is offered in 8‑pin SO and 8‑pin PDIP packages and meets commercial and industrial temperature ranges. Detailed electrical characteristics, switching timings, and protection specifications are provided for design reference.
| Supply Voltage | 3.3 V ±10 % |
|---|---|
| Maximum Data Rate | 250 kbps |
| Fault Protection Voltage | ±80 V |
| Receiver Input Impedance | 1/4‑unit‑load (≈48 kΩ) |
| Package Types | 8‑pin SO, 8‑pin PDIP |
| ESD Protection | ±12 kV (Human Body Model) |
| Fail‑Safe Input Threshold | -50 mV to -200 mV |
The MAX3430 supports data rates up to 250 kbps.
Its 1/4‑unit‑load receiver input allows up to 128 transceivers on one bus.
The device provides ±80 V fault protection on the communication lines.
The transceiver operates from a 3.3 V supply (±10 %).