DATASHEET ISL3330, ISL3331 FN6361 Rev 0.00 3.3V, 15kV ESD Protected, Dual Protocol (RS-232/RS-485) Transceivers May 20, 2008 These devices are BiCMOS interface ICs that are user Features configured as either a single RS-422/RS-485 differential User Selectable RS-232 or RS-485/RS-422 Interface Port transceiver, or as a dual (2 Tx, 2 Rx) RS-232 transceiver. (Two RS-232 Transceivers or One RS-485/RS-422 In RS-232 mode, the on-board charge pump generates Transceiver) RS-232 compliant 5V Tx output levels, from a supply as low Operates From a Single 3.3V Supply as 3.15V. Four small 0.1F capacitors are required for the 15kV (HBM) ESD Protected Bus Pins (RS-232 or charge pump. The transceivers are RS-232 compliant, with RS-485) the Rx inputs handling up to 25V. 5V Tolerant Logic Inputs In RS-485 mode, the transceivers support both the RS-485 and RS-422 differential communication standards. The True Flow-Through Pinouts Simplify Board Layouts RS-485 receiver featuresfull failsaf operation, so the Rx Pb-Free (RoHS Compliant) output remains in a high state if the inputs are open or Full Failsafe (Open/Short) Rx in RS-485/RS-422 Mode shorted together. The RS-485 transmitter supports up to three data rates, two of which are slew rate limited for Loopback Mode Facilitates Board Self Test Functions problem free communications. The charge pump disables in User Selectable RS-485 Data Rates 20Mbps RS-485 mode, thereby saving power, minimizing noise, and - Slew Rate Limited . 460kbps eliminating the charge pump capacitors. - Slew Rate Limited (ISL3331 Only) 115kbps Both RS-232/RS-485 modes feature loopback and shutdown Fast RS-232 Data Rate . Up to 400kbps functions. The loopback mode internally connects the Tx outputs to the corresponding Rx input, which facilitates the Low Current Shutdown Mode 30A implementation of board level self test functions. The outputs QFN Package Saves Board Space (ISL3331 Only) remain connected to the loads during loopback, where Logic Supply Pin (V ) Eases Operation in Mixed Supply L connection problems (e.g., shorted connectors or cables) Systems (ISL3331 Only) can be detected. The shutdown mode disables the Tx and Rx outputs, disables the charge pump if in RS-232 mode, Applications and places the IC in a low current (30A) mode. Gaming Applications (e.g., Slot machines) The ISL3331 is a QFN packaged device that offers Single Board Computers additional functionality, including a lower speed and edge rate option (115kbps) for EMI sensitive designs, or to allow Factory Automation longer bus lengths. It also features a logic supply voltage pin Security Networks (V ) that sets the V level of logic outputs, and the L OH switching points of logic inputs, to be compatible with Industrial/Process Control Networks another supply voltage in mixed voltage systems. The QFN s Level Translators (e.g., RS-232 to RS-422) choice of active high or low Rx enable pins increases design flexibility, allowing Tx/Rx direction control via a single signal Point of Sale Equipment by connecting DEN and RXEN together. Related Literature For a dual port version of these devices, please see the ISL3332/ISL3333 data sheet. Application Note AN1401 Implementing a Three Pin, Half-Duplex, Dual Protocol Interface TABLE 1. SUMMARY OF FEATURES PART NO. OF RS-485 DATA RS-232 DATA ACTIVE H or L LOW POWER PACKAGE OPTIONS V PIN NUMBER PORTS RATE (bps) RATE (kbps) Rx ENABLE SHUTDOWN L ISL3330 1 20 Ld SSOP 20M, 460k 400 No H Yes ISL3331 1 40 Ld QFN (6mmx6mm) 20M, 460k, 115k 400 Yes Both Yes FN6361 Rev 0.00 Page 1 of 25 May 20, 2008ISL3330, ISL3331 Ordering Information PART NUMBER (NOTE) PART MARKING TEMP. RANGE (C) PACKAGE (Pb-Free) PKG. DWG. ISL3330IAZ 3330 IAZ -40 to +85 20 Ld SSOP M20.209 ISL3330IAZ-T* 3330 IAZ -40 to +85 20 Ld SSOP (Tape and Reel) M20.209 ISL3331IRZ ISL3331IRZ -40 to +85 40 Ld 6x6 QFN L40.6x6 ISL3331IRZ-T* ISL3331IRZ -40 to +85 40 Ld 6x6 QFN (Tape and Reel) L40.6x6 *Please refer to TB347 for details on reel specifications. NOTE: These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. Pinouts ISL3330 (20 LD SSOP) TOP VIEW C1+ 1 20 C2+ C1- 2 19 C2- V+ 3 18 V CC A 4 17 R A B 5 16 R B Y 6 15 D Y D /SLEW Z 7 14 Z 13 ON 485/232 8 DEN 9 12 RXEN 10 11 V- GND ISL3331 (40 LD QFN) TOP VIEW 40 39 38 37 36 35 34 33 32 31 V+ 1 30 R A A 2 29 R B B 3 28 D Y Y 4 27 D /SLEW Z Z 5 26 NC NC NC 6 25 NC NC 7 24 NC NC 8 23 NC 9 22 NC NC 10 21 ON 11 12 13 14 15 16 17 18 19 20 FN6361 Rev 0.00 Page 2 of 25 May 20, 2008 485/232 NC DEN NC NC C1- SPB C1+ GND C2+ GND C2- V RXEN CC NC NC V- NC RXEN V L