LMS1485

Supply Voltage, V_CC (Note 2) .................................................................7V
Input Voltage, V_IN (DI, DE, or RE) ...............................−0.3V to V_CC + 0.3V
Voltage Range at Bus Terminals (AB) ........................................−7V to 12V
Receiver Output ..........................................................−0.3V to V_CC + 0.3V
Package Thermal Impedance, _JA
SOIC ..............................................................................................125/W
Junction Temperature (Note 3) ...........................................................150
Operating Free-Air Temperature
Range, T_A
Commercial .................................................................................0 to 70
Industrial ................................................................................−40 to 85
Storage Temperature Range ................................................−65 to 150
Soldering Information
Infrared or Convection (20 sec.) .........................................................235
Lead Temperature Range .................................................................+260
ESD Rating (Human Body Model)(Note 4)
ESD Rating (Note 4) (Note 8) .................................................................8kV
Other Pins ..............................................................................................2kV
ESD Rating (Machine Model)
All Pins .................................................................................................235

The LMS1485 is a low power differential bus/line transceiver designed for high speed bidirectional data communication on multipoint bus transmission lines. It is designed for balanced transmission lines. It meets ANSI Standards TIA/EIA RS422-B, TIA/EIA RS485-A and ITU recommendation and V.11 and X.27.

The LMS1485 combines a TRI-STATE™ differential line driver and differential input receiver, both of which operate from a single 5.0V power supply.

The driver and receiver have an active high and active low, respectively, that can be externally connected to function as a direction control.

The driver and receiver differential inputs are internally connected to form differential input/output (I/O) bus ports that are designed to offer minimum loading to bus whenever the driver is disabled or when V_CC = 0V. These ports feature wide positive and negative common mode voltage ranges, making the device suitable for multipoint applications in noisy environments.

The LMS1485 is build with National's advanced BiCMOS process and is available in a 8-Pin SOIC package. It is a drop-in socket replacement to ADI's ADM1485 and LTC's LT1485.