IL3485/IL3422 High Speed Passive Input RS-485 and RS-422 Isolated Transceivers Functional Diagrams Features 20 Mbps data rate 3 V to 5 V power supplies DE Supports up to 32 nodes V 15 kV bus ESD protection COIL1 2500 V isolation per UL 1577 RMS D 20 kV/s typical common mode rejection V No carrier or clock for low EMI emissions and susceptibility COIL2 R A 40C to +85C temperature range B Thermal shutdown protection RE UL 1577 recognized IEC 60747-5-5 (VDE 0884) certified 0.15 , 0.3 , or True 8 mm 16-pin SOIC packages IL3485 DE Applications V COIL1 Data loggers Y P.O.S. systems Z D Security networks V COIL2 Building environmental controls R A Industrial control networks B Factory automation RE IL3422 Description IL3485 Truth Table The IL3485 and IL3422 are galvanically isolated, differential V DE D R RE Mode (AB) bus transceivers designed for bidirectional data 200 mV H H H L Drive communication over balanced transmission lines. The 200 mV H L L L Drive devices use NVEs patented* IsoLoop spintronic Giant 200 mV L X H L Receive Magnetoresistance (GMR) technology. The IL3485 delivers 200 mV L X L L Receive at least 1.5 V into a 54 load, and the IL3422 at least 2 V X X X Z H X into a 100 load for excellent data integrity over long Open L X H L Receive cables. These devices are also compatible with 3 V input Z = High Impedance X = Irrelevant supplies, allowing interface to standard microcontrollers IL3422 Receiver IL3422 Driver without additional level shifting. RE R V DE D V (AB) (YZ) H Z X L X Z Both the IL3485 and IL3422 have current limiting and L H 200 mV H H 200 mV thermal shutdown features to protect against output short L L 200 mV H L 200 mV circuits and bus contentions that may cause excessive power L H Open dissipation. The receivers also incorporate a fail-safe if open design, ensuring a logic high on R if the bus lines are Selection Table disconnected or floating. Full/Half No. of Devices Data Rate Model Duplex Allowed on Bus Mbps Fail-Safe IL3485 half 32 20 yes IL3422 full 32 20 yes IsoLoop is a registered trademark of NVE Corporation. REV. P *U.S. Patent numbers 5,831,426 6,300,617 and others. NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617 Phone: (952) 829-9217 www.isoloop.com iso-info nve.com NVE Corporation IL3485/IL3422 Absolute Maximum Ratings Operating at absolute maximum ratings will not damage the device. However, extended periods of operation at the absolute maximum ratings may affect performance and reliability. Parameters Symbol Min. Typ. Max. Units Test Conditions Storage Temperature T 55 150 C S Ambient Operating Temperature T 40 85 C A Voltage Range at A or B Bus Pins 7 12 V (1) Supply Voltage V , V 0.5 7 V DD1 DD2 Digital Input Voltage 0.5 V+0.5 V DD Digital Output Voltage 0.5 V+1 V DD ESD Protection 15 kV Input Current I 25 +25 mA IN ESD (all bus nodes) 15 kV HBM Note 1. All voltage values are with respect to network ground except differential I/O bus voltages. Recommended Operating Conditions Parameters Symbol Min. Typ. Max. Units Test Conditions V 3.0 5.5 DD1 Supply Voltage V V 4.5 5.5 DD2 Ambient Operating Temperature T 40 85 C A Input Voltage at any Bus Terminal V 12 I V (separately or common mode) V 7 IC Input Threshold for Output Logic I 1.5 0.8 mA INH High Input Threshold for Output Logic Low I 5 3.5 mA INL Differential Input Voltage V +12/ 7 V ID High-Level Output Current (Driver) I 60 60 mA OH High-Level Digital Output Current 8 8 mA I OH (Receiver) Low-Level Output Current (Driver) I 60 60 mA OL Low-Level Digital Output Current I 8 8 mA OL (Receiver) Ambient Operating Temperature T 40 85 C A Digital Input Signal Rise, Fall Times t ,t 1 s IR IF Insulation Specifications Parameters Symbol Min. Typ. Max. Units Test Conditions Comparative Tracking Index CTI 175 V Per IEC 60112 Endurance Voltage AC 1000 V RMS At maximum (Maximum Working Voltage V IO operating temperature for Indefinite Life) DC 1500 V DC Creepage Distance 0.15 SOIC 4.03 mm Per IEC 60601 (external) 0.3 SOIC 8.03 8.3 Total Barrier Thickness (internal) 0.012 0.013 mm 14 Barrier Resistance R >10 500 V IO Barrier Capacitance C 7 pF f = 1 MHz IO Leakage Current 0.2 A 240 V , 60 Hz RMS 2 NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617 Phone: (952) 829-9217 Fax: (952) 829-9189 www.IsoLoop.com NVE Corporation