Intersil – 3.3V, ±15kV ESD Protected, Two Port, Dual Protocol (RS-232/RS-485) Transceivers
Today Intersil is introducing the ISL3333xE/ISL3335xE dual protocol transceivers, a family of 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 (ISL3333xE) and as low as 4.5V (ISL3335xE). 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 and ISL33337E 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 (40μA for ISL3333xE; 55μA for ISL3335xE) mode.
Target applications include:
• 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
Key Features and Specifications of ISL3354/57E:
• ±15kV (HBM) ESD protected bus pins (RS-232 or RS-485)
• Operates from a single 5V 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
• 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 – 460kbps (Minimum)
• Small charge pump capacitors – 4 x 0.1μF
• Low current shutdown mode – 55μA
Key Features and Specifications of ISL3334/37E:
• ±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
• Pb-free (RoHS compliant)
• Full fail-safe (open/short) RS-485/422 Port 2 Rx
• User selectable RS-485 data rates
– Fast speed up tp 20Mbps
– Slew rate limited up to 115kbps
• Fast RS-232 data rate up to 400kbps
• Small charge pump capacitors – 4 x 0.1μF
• Low current shutdown mode – 40μA
• QFN package saves board space (ISL33337E only)
for more information about ISL3335xE click here
for more information about ISL 3333xE click here
