DESCRIPTION

The UTC UTRS485N is a Polarity-Free half-duplex transceiver

designed for RS-485 data bus network, which contains one transmitter

and one receiver. The UTC UTRS485N features a fail-safe receiver,

which guarantees the receiver to output high when the receiver inputs

are open, short or idle.

The UTC UTRS485N can automatically detect the polarity for A

and B pins when pull-high for A and pull-low for B have been designed

on the RS485 bus. The detection function is real-time monitored the

bus polarity without any data flow on the RS485 bus.

The UTC UTRS485N also features a hot-swap glitch free

protection circuits which guarantee outputs of both the transmitter and

the receiver in a high impedance state during the power up period. So

that the large short current from power to ground will be disable by

glitch free function, which will save the power and enhance the

efficiency of the power up.

The UTC UTRS485N is optimized for signal rates up to1Mbps with

differential voltage of 2.3V. The UTC UTRS485N also has the thermal

shutdown function when the temperature is over 150°C and the

protection of the current limitation in the transmitter to protect the itself

from the damage by the system-fault conditions during normal

operation.

FEATURES

* Meet the requirements of the EIA/TIA-485 standards.

* 5.0V single power supply.

* 1µA low-current shutdown mode.

* HBM ±12kV ESD protection for Transmitter Output

* True fail-safe receiver while maintaining EIA/TIA-485 compatibility.

* Hot-swap glitch free protection on control inputs.

* Up to 256 transceivers on the bus.

* Maximum baud rate up to 1Mbps.

* Transmitter short circuit current limit.

* Thermal shutdown for overload protection.

* Polarity-Free for RS485 bus pins.