The UM3481D is robust half-duplex RS-485 transceivers for industrial applications. The device features auto-direction control using the data input pin that reduces the reliance on separate pins for driver-enable and the receiver-enable functionality. This reduces the number of isolation channels needed or number of the GPIO pins needed for logic control. The bus pins are immune to high levels of IEC ESD events eliminating need of additional system level protection components.

The UM3481D is available in 1Mbps. The device operates from a single 3V to 5.5V supply. Extended ±15V common-mode range and low input leakage on bus pins make devices suitable for multi-point applications over long cable runs.

The UM3481D is available in SOP8, MSOP8 and DFN8 3.0×3.0 packages for space-constrained applications. The device is characterized over ambient free-air temperatures from -40°C to 125°C.

- Meets or exceeds the requirements of the TIA/EIA-485A standards

- 3V to 5.5V supply voltage

- Auto-direction control using the data input pin

- Differential output exceeds 2.1 V for PROFIBUS compatibility with 5V supply

- Data Rates up to 1Mbps

- Bus I/O protection

-- ±18V DC bus fault

-- ±8kV Human body model (HBM)

-- ±9kV IEC 61000-4-2 contact discharge

- Latch-up performance exceeds 200mA per JESD 78

- Extended operational common-mode range: ±15V

- Glitch-free power-up/down for hot plug-in capability

- Extended ambient temperature range: -40°C to 125°C

- Enhanced receiver hysteresis for noise immunity

- Low power consumption:

-- Quiescent current during operation: 1.7 mA (typ)

- Open, short, and idle bus failsafe

- 1/8 unit load (up to 256 bus nodes)

- Thermal shutdown

- Factory automation and control

- Building automation

- HAVC systems

- Video surveillance

- Smart meters