Intersil – ISL33334E/37E/54E/57E Transceivers (RS-232/RS-485)


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The ISL33334E/37E/54E/57E 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.

The on-board charge pump generates RS-232 compliant ±5V Tx output levels from a single VCC supply as low as 3.15V for ISL33334E, ISL33337E and 4.5V for ISL33354E, ISL33357E. The transceivers are RS-232 compliant, with the Rx inputs handling up to ±25V.

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.

The ISL33334E/37E also include a shutdown function, which disables the Tx and Rx outputs, disables the charge pumps and places the IC in a low current mode of 40μA for ISL33334E/37E and 55μA for ISL33354E/57E.


  • ±15kV (HBM) ESD protected bus pins (RS-232 or RS-485)
  • Operates from a single 3.3V supply
  • 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
  • Full fail-safe (open/short) RS-485/422 Port 2 Rx
  • User selectable RS-485 data rates
  • Fast RS-232 data rate: up to 400kbps for ISL33334E/37E and minimum of 460kbps for ISL33354E/57E
  • Small charge pump capacitors: 4 x 0.1μF
  • Low current shutdown mode: 40μA for ISL33334E/37E and 55μA for ISL33354E/57E
  • Fast speed: up to 20Mbps
  • Slew rate limited: up to 115kbps


  • Gaming applications (e.g., slot machines)
  • Single board computers
  • Factory automation
  • Security networks
  • Industrial/process control networks
  • Level translators (e.g., RS-232 to RS-422)
  • Point of sale equipment