DATASHEET ISL81334, ISL41334 FN6202 Rev.4.01 15kV ESD Protected, Two Port, Dual Protocol Transceivers Oct 24, 2019 The ISL81334 and ISL41334 are two-port interface ICs in Features which each port can be independently configured as a single 15kV (HBM) ESD protected bus pins (RS-232 or RS-485) RS-485, RS-422 transceiver, or as a dual (2 Tx, 2 Rx) RS-232 transceiver. With both ports set to the same mode, two Two independent ports, each user selectable for RS-232 RS-485, RS-422 transceivers, or four RS-232 transceivers are (2 transceivers) or RS-485, RS-422 (1 transceiver) available. Single 5V (10% tolerance) supply If either port is in RS-232 mode, the onboard charge pump Flow-through pinouts simplify board layouts generates RS-232 compliant 5V Tx output levels from a Pb-Free (RoHS compliant) single V supply as low as 4.5V. Four small 0.1F capacitors CC are required for the charge pump. The transceivers are RS-232 Large (2.7V) differential V for improved noise immunity OUT compliant, with the Rx inputs handling up to 25V, and the Tx in RS-485, RS-422 networks outputs handling 12V. Full fail-safe (open/short) Rx in RS-485, RS-422 mode In RS-485 mode, the transceivers support both the RS-485 Loopback mode facilitates board self-test functions and RS-422 differential communication standards. The User selectable RS-485 data rates (ISL41334 only) receivers feature full fail-safe operation, so the Rx outputs - Fast speed . 20Mbps remain in a high state if the inputs are open or shorted together. The transmitters support up to three data rates, two - Slew rate limited . 460kbps of which are slew rate limited for problem-free - Slew rate limited . 115kbps communications. The charge pump disables when both ports Fast RS-232 data rate up to 650kbps are in RS-485 mode, thereby saving power, minimizing noise, and eliminating the charge pump capacitors. Low current Shutdown mode 42A QFN package saves board space (ISL41334 only) Both RS-232 and RS-485 modes feature loopback and shutdown functions. Loopback internally connects the Tx Logic supply pin (V ) eases operation in mixed supply L outputs to the corresponding Rx input, to facilitate board level systems (ISL41334 only) self-test implementation. The outputs remain connected to the loads during loopback, so connection problems (such as Applications shorted connectors or cables) can be detected. Shutdown Gaming applications (such as, slot machines) mode disables the Tx and Rx outputs, disables the charge pumps, and places the IC in a low current (A) mode. Single board computers Factory automation The ISL41334 is a QFN packaged device that includes two additional user selectable, lower speed, and edge rate options Security networks for EMI-sensitive designs, or to allow longer bus lengths. It also Industrial/process control networks features a logic supply pin (V ) that sets the V level of logic L OH Level translators, such as RS-232 to RS-422 outputs, and the switching points of logic inputs, to be compatible with another supply voltage in mixed voltage Point of sale equipment systems. The QFN also adds active low Rx enable pins to Dual channel RS-485 interfaces increase design flexibility, allowing Tx/Rx direction control, through a single signal per port, by connecting the Related Literature corresponding DE and RXEN pins together. For a full list of related documents, visit our website: For a single port version of these devices, please see the ISL81387, ISL41387 datasheet. ISL81334, ISL41334 device pages FN6202 Rev.4.01 Page 1 of 33 Oct 24, 2019ISL81334, ISL41334 Table of Contents Ordering Information . 3 Pin Configurations . 4 Pin Descriptions . 4 ISL81334 Truth Tables 6 ISL41334 Truth Tables 7 Typical Operating Circuits 8 Absolute Maximum Ratings 10 Thermal Information 10 Operating Conditions . 10 Electrical Specifications 10 Test Circuits and Waveforms . 14 Typical Application . 16 RS-232 to RS-485 Converter 16 Detailed Description 16 ISL81334 and ISL41334 Advantages 17 RS-232 Mode . 18 Rx Features . 18 Tx Features . 18 Charge Pumps 18 Data Rates and Cabling 18 RS-485 Mode . 18 Rx Features . 18 Tx Features . 19 Speed Options 19 Data Rate, Cables, and Terminations . 19 High ESD . 19 Small Packages . 20 Flow Through Pinouts 20 Low Power Shutdown (SHDN) Mode 20 Internal Loopback Mode 20 ISL41334 (QFN Package) Special Features . 20 Logic Supply (VL Pin) . 20 Active Low Rx Enable (RXEN) 21 RS-485 Slew Rate Limited Data Rates 21 Evaluation Board . 22 Typical Performance Curves . 22 Die Characteristics . 28 Revision History 29 Package Outline Drawings . 30 FN6202 Rev.4.01 Page 2 of 33 Oct 24, 2019