ISL81334

Features:

• ±15kV (HBM) ESD Protected Bus Pins (RS-232 or
RS-485)
• Two Independent Ports, Each User Selectable for RS-232 (2 Transceivers) or RS-485/422 (1 Transceiver)
• Flow-Through Pinouts Simplify Board Layouts
• Pb-Free Plus Anneal Available (RoHS Compliant)
• Large (2.7V) Differential V_OUT for Improved Noise Immunity in RS-485/422 Networks
• Full Failsafe (Open/Short) Rx in RS-485/422 Mode
• Loopback Mode Facilitates Board Self Test Functions
• User Selectable RS-485 Data Rates (ISL41334 Only)
- Fast Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Mbps
- Slew Rate Limited. . . . . . . . . . . . . . . . . . . . . . . 460kbps
- Slew Rate Limited. . . . . . . . . . . . . . . . . . . . . . . 115kbps
• Fast RS-232 Data Rate . . . . . . . . . . . . . . . Up to 650kbps
• Low Current Shutdown Mode. . . . . . . . . . . . . . . . . . .42A
• QFN Package Saves Board Space (ISL41334 Only)
• Logic Supply Pin (V_L) Eases Operation in Mixed Supply Systems (ISL41334 Only)




Application

• 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
• Dual Channel RS-485 Interfaces




Pinout






Specifications

V_CC to Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
V_L (QFN Only) . . . . . . . . . . . . . . . . . . .......... . . . . . . -0.5V to V_CC + 0.5V
Input Voltages
All Except A, B (non-QFN Package) . ............ . . . -0.5V to (V_CC + 0.5V)
All Except A, B (QFN Package) . . ........... . . . . . . . -0.5V to (V_L + 0.5V)
Input/Output Voltages
A, B (Any Mode). . . . . . . . . . . . . . . .... . . . . . . . . . . . . -25V to +25V
Y, Z (Any Mode, Note 3) . . . . . . . . ....... . . . . . . . . . . -12.5V to +12.5V
R_A, R_B (non-QFN Package). . . . . . ............ . . . . . -0.5V to (V_CC + 0.5V)
R_A, R_B (QFN Package) . . . . . . . . . . . . ........... . . . -0.5V to (V_L + 0.5V)
Output Short Circuit Duration
Y, Z, R_A, R_B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Indefinite
ESD Rating . . . . . . . . . . . . . . . . . . . ............ . . . . . See Specification Table




Description

The ISL81334, ISL41334 are two port interface ICs where each port can be independently configured as a single 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 RS-485, RS-422 transceivers, or four RS-232 transceivers are available. If either port is in RS-232 mode, the onboard charge pump generates RS-232 compliant 5V Tx output levels from a single VCC supply as low as 4.5V. Four small 0.1F capacitors are required for the charge pump. The transceivers are RS-232 compliant, with the Rx inputs handling up to 25V, and the Tx outputs handling 12V. In RS-485 mode, the transceivers support both the RS-485 and RS-422 differential communication standards. The receivers feature "full failsafe" operation, so the Rx outputs remain in a high state if the inputs are open or shorted together. The transmitters support up to three data rates, two of which are slew rate limited for problem free communications. The charge pump disables when both ports are in RS-485 mode, thereby saving power, minimizing noise, and eliminating the charge pump capacitors. Both RS-232 and RS-485 modes feature loopback and shutdown functions. Loopback internally connects the Tx outputs to the corresponding Rx input, to facilitate board level self test implementation. The outputs remain connected to the loads during loopback, so connection problems (e.g., shorted connectors or cables) can be detected. Shutdown mode disables the Tx and Rx outputs, disables the charge pumps, and places the IC in a low current (A) mode. The ISL41334 is a QFN packaged device that includes two additional user selectable, lower speed and edge rate options for EMI sensitive designs, or to allow longer bus lengths. It also features a logic supply pin (VL) that sets the VOH level of logic outputs, and the switching points of logic inputs, to be compatible with another supply voltage in mixed voltage systems. The QFN also adds active low Rx enable pins to increase design flexibility, allowing Tx/Rx direction control, via a single signal per port, by connecting the corresponding DE and RXEN pins together. For a single port version of these devices, please see the ISL81387, ISL41387 data sheet.