DATASHEET ISL81387, ISL41387 FN6201 Rev 4.00 15kV ESD Protected, 5V, Dual Protocol (RS-232/RS-485) Transceivers June 9, 2014 These devices are BiCMOS interface ICs that are user Features configured as either a single RS-422, RS-485 differential 5V powered, user selectable RS-232 or RS-485, RS-422 transceiver, or as a dual (2 Tx, 2 Rx) RS-232 transceiver. interface port (two RS-232 transceivers or one RS-485, In RS-232 mode, the on-board charge pump generates RS-232 RS-422 transceiver) compliant 5V Tx output levels, from a supply as low as 4.5V. 15kV (HBM) ESD protected bus pins (RS-232 or RS-485) Four small 0.1F capacitors are required for the charge pump. The transceivers are RS-232 compliant, with the Rx inputs True flow-through pinouts simplify board layouts handling up to 25V, and the Tx outputs handling 12V. Pb-Free (RoHS compliant) In RS-485 mode, the transceivers support both the RS-485 Large (2.7V) differential V for improved noise immunity OUT and RS-422 differential communication standards. The in RS-485, RS-422 networks RS-485 receiver featuresfull fail-saf operation, so the Rx Full fail-safe (open/short) Rx in RS-485, RS-422 mode output remains in a high state if the inputs are open or shorted together. The RS-485 transmitter supports up to three data Loopback mode facilitates board self test functions rates, two of which are slew rate limited for problem free User selectable RS-485 data rates 20Mbps communications. The charge pump disables in RS-485 mode, - Slew rate limited . 460kbps thereby saving power, minimizing noise, and eliminating the - Slew rate limited (ISL41387 only) . 115kbps charge pump capacitors. Fast RS-232 data rate up to 650kbps Both RS-232, RS-485 modes feature loopback and shutdown functions. The loopback mode internally connects the Tx Low current shutdown mode 35A outputs to the corresponding Rx input, which facilitates the QFN package saves board space (ISL41387 only) implementation of board level self test functions. The outputs remain connected to the loads during loopback, so connection Logic supply pin (V ) eases operation in mixed supply L problems (e.g., shorted connectors or cables) can be detected. systems (ISL41387 only) The shutdown mode disables the Tx and Rx outputs, disables the charge pump if in RS-232 mode, and places the IC in a low Applications current (35A) mode. Gaming applications (e.g., slot machines) The ISL41387 is a QFN packaged device that offers additional Single board computers functionality, including a lower speed and edge rate option Factory automation (115kbps) for EMI sensitive designs, or to allow longer bus lengths. It also features a logic supply voltage pin (V ) that sets Security networks L the V level of logic outputs, and the switching points of logic OH Industrial/process control networks inputs, to be compatible with another supply voltage in mixed Level translators (e.g., RS-232 to RS-422) voltage systems. The QFN s choice of active high or low Rx enable pins increases design flexibility, allowing Tx/Rx Point of sale equipment direction control via a single signal by connecting DEN and RXEN together. Related Literature AN1378, Implementing a Three Pin, Half-Duplex, Dual For a dual port version of these devices, please see the Protocol (RS-232/RS-485) Interface Using the ISL81387 or ISL81334, ISL41334 datasheet. ISL41387. TABLE 1. SUMMARY OF FEATURES PART NO. OF RS-485 DATA RATE RS-232 DATA ACTIVE H or L Rx LOW POWER PACKAGE OPTIONS V PIN NUMBER PORTS (bps) RATE (kbps) ENABLE SHUTDOWN L ISL81387 1 20 Ld SOIC, 20 Ld SSOP 20M, 460k 650 NO H YES ISL41387 1 40 Ld QFN (6mmx6mm) 20M, 460k, 115k 650 YES BOTH YES FN6201 Rev 4.00 Page 1 of 27 June 9, 2014ISL81387, ISL41387 Ordering Information PART NUMBER PART TEMP. RANGE PACKAGE PKG. (Notes 1, 2) MARKING (C) (Pb-Free) DWG. ISL81387IAZ 81387 IAZ -40 to +85 20 Ld SSOP M20.209 ISL81387IBZ ISL81387IBZ -40 to +85 20 Ld SOIC M20.3 ISL41387IRZ 41387 IRZ -40 to +85 40 Ld QFN L40.6x6 NOTES: 1. Add -T* suffix for tape and reel. Please refer to TB347 for details on reel specifications. 2. 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. Pin Configurations ISL81387 (20 LD SOIC, SSOP) TOP VIEW C1+ 1 20 C2+ C1- 2 19 C2- V+ 3 18 V CC A 4 17 R A 16 R B 5 B Y 6 15 D Y Z 7 14 D /SLEW Z 485/232 8 13 ON DEN 9 12 RXEN GND 10 11 V- ISL41387 (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 EP NC 6 25 NC NC 7 24 NC NC 8 23 NC NC 9 22 NC NC 10 21 ON 11 12 13 14 15 16 17 18 19 20 FN6201 Rev 4.00 Page 2 of 27 June 9, 2014 485/232 NC NC DEN NC C1- SPB C1+ GND C2+ GND C2- V RXEN CC NC NC V- NC RXEN V L