DATASHEET
ISL33334E, ISL33337E FN8776
Rev 1.00
October 21, 2016 3.3V, В±15kV ESD Protected, Two Port, Dual Protocol (RS-232/RS-485)
Transceivers
The ISL33334E, ISL33337E are two port interface ICs where
port 1 is configured as a dual (2 Tx, 2 Rx) RS-232 transceiver
and port 2 is a single RS-485/RS-422 transceiver. Features The on-board charge pump generates RS-232 compliant В±5V
Tx output levels from a single VCC supply as low as 3.15V. The
transceivers are RS-232 compliant, with the Rx inputs
handling up to В±25V. Operates from a single 3.3V supply The port 2 transceiver supports both the RS-485 and RS-422
differential communication standards. The receiver features
“full fail-safe” operation, so the Rx output remains in a high
state if the inputs are open or shorted together. The
transmitter supports two data rates, one of which is slew rate
limited for problem free communication at low data rates. The
active low Rx enable pin (RE485) allows Tx/Rx direction
control, via a single signal, simply by connecting the
corresponding DE485 and RE485 pins together. В±15kV (HBM) ESD protected bus pins (RS-232 or RS-485) Two independent ports, port 1 set for RS-232 (2 Transceivers)
and port 2 for RS-485/RS-422 (1 transceiver) True flow-through pinouts (Rx inputs and Tx outputs all on
the same side) simplify board layouts Pb-free (RoHS compliant) Full fail-safe (open/short) RS-485/422 Port 2 Rx User selectable RS-485 data rates
-Fast speed up to 20Mbps
-Slew rate limited up to 115kbps Fast RS-232 data rate up to 400kbps The ISL33334E and ISL33337E also include a shutdown …
