DATASHEET
ISL81387, ISL41387 FN6201
Rev 4.00
June 9, 2014 В±15kV ESD Protected, 5V, Dual Protocol (RS-232/RS-485) Transceivers
These devices are BiCMOS interface ICs that are user
configured as either a single RS-422, RS-485 differential
transceiver, or as a dual (2 Tx, 2 Rx) RS-232 transceiver.
In RS-232 mode, the on-board charge pump generates RS-232
compliant В±5V Tx output levels, from a supply as low as 4.5V.
Four small 0.1ВµF capacitors are required for the charge pump.
The transceivers are RS-232 compliant, with the Rx inputs
handling up to п‚±25V, and the Tx outputs handling В±12V.
In RS-485 mode, the transceivers support both the RS-485
and RS-422 differential communication standards. The
RS-485 receiver features "full fail-safe" operation, so the Rx
output remains in a high state if the inputs are open or shorted
together. The RS-485 transmitter supports up to three data
rates, two of which are slew rate limited for problem free
communications. The charge pump disables in RS-485 mode,
thereby saving power, minimizing noise, and eliminating the
charge pump capacitors. Features 5V powered, user selectable RS-232 or RS-485, RS-422
interface port (two RS-232 transceivers or one RS-485,
RS-422 transceiver) В±15kV (HBM) ESD protected bus pins (RS-232 or RS-485) True flow-through pinouts simplify board layouts Pb-Free (RoHS compliant) Large (2.7V) differential VOUT for improved noise immunity …
