The MAX1482 and MAX1483 are low-power transceivers for RS-485 and RS-422 communication. Both feature slew-rate-limited drivers that minimize EMI and reduce reflections caused by improperly terminated cables. Data rates are guaranteed up to 250kbps. The MAX1482/MAX1483 draw only 20µA of supply current. Additionally, they have a low-current shutdown mode that consumes only 0.1µA. Both parts operate from a single +5V supply. Drivers are short-circuit current limited and are protected against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into a high-impedance state. The receiver input has a fail-safe feature that guarantees a logic-high output if the input is open circuit. The MAX1482 is full duplex and the MAX1483 is half duplex. Both parts have a 1⁄8-unit-load input impedance that guarantees up to 256 transceivers on the bus.
The MAX1482 and MAX1483 are low‑power transceivers for RS‑485 and RS‑422 communication. Both feature slew‑rate‑limited drivers that reduce EMI and reflections, operate from a single +5 V supply, and draw only 20 µA in normal mode with a 0.1 µA shutdown current. The MAX1482 is a full‑duplex device, while the MAX1483 is half‑duplex, and each supports up to 256 transceivers on a bus (1/8‑unit‑load input impedance).\n\nThe data sheet provides absolute maximum ratings, electrical characteristics, timing parameters, package information, and typical application circuits. It also describes the low‑power shutdown mode, driver output protection, and performance over temperature and line length.
| Operating current | 20 µA |
|---|---|
| Shutdown current | 0.1 µA |
| Supply voltage | 5 V ±5 % (4.75 V–5.25 V) |
| Maximum data rate | 250 kbps |
| Input impedance | 1/8‑unit load (≈96 kΩ) |
| Common‑mode input range | -7 V to +12 V |
| Driver output voltage range | -7.5 V to +12.5 V |
| Receiver input voltage range | -7.5 V to +12.5 V |
| Maximum number of devices on bus | 256 |
The devices draw only 20 µA of supply current in normal operation.
Up to 256 transceivers can be connected because each device presents a 1/8‑unit‑load input impedance.
The MAX1482 and MAX1483 support data rates up to 250 kbps.
In low‑power shutdown mode the devices consume only 0.1 µA.