EVALUATION KIT AVAILABLE MAX14943 5kV Isolated 20Mbps Half-Duplex PROFIBUS DP/ RMS RS-485 Transceiver with 35kV ESD Protection and Integrated Transformer Driver General Description Benefits and Features The MAX14943 isolated RS-485/PROFIBUS DP transceiver High Integration Simplifies Designs provides 5000V (60s) of galvanic isolation between Integrated LDO for Cable-Side Power RMS the cable side (RS-485 driver/receiver side) and the UART Integrated Transformer Driver for Power Transfer to Cable Side Has Up to 80% Efficiency at 150mA side of the device. Isolation improves communication by breaking ground loops and reduces noise when there are Load large differences in ground potential between ports. This High-Performance Transceiver Enables Flexible device allows for robust communication up to 20Mbps. Designs The device includes an integrated 450kHz transformer Compliant with RS-485 and EIA 61158-2 Type 3 PROFIBUS DP Standards driver for power transfer to the cable side of the transceiver using an external transformer. An integrated LDO provides 20Mbps (max) Data Rate Up to 128 Devices on the Bus a simple and space-efficient architecture for providing power to the cable side of the IC. Integrated Protection for Robust Communication The device includes one half-duplex driver/receiver channel. 35kV ESD (HBM) on Driver Outputs/Receiver Inputs The receiver is 1/4-unit load, allowing up to 128 transceivers 5kV Withstand Isolation Voltage for 60s (V ) on a common bus. RMS ISO 1200V Maximum Repetitive Peak-Isolation PEAK Integrated true fail-safe circuitry ensures a logic-high on Voltage (V ) IORM the receiver output when inputs are shorted or open. 848V Maximum Working-Isolation Voltage RMS Undervoltage lockout disables the driver when cable-side (V ) IOWM or UART-side power supplies are below functional levels. > 30 Years Lifetime at Rated Working Voltage The driver outputs/receiver inputs are protected from Withstands 10kV Surge per IEC 61000-4-5 35kV electrostatic discharge (ESD) to GNDB on the Thermal Shutdown cable side, as specified by the Human Body Model (HBM). The MAX14943 is available in a 16-pin wide-body SOIC Functional Diagram package and operates over the -40C to +105C temperature range. V V DDA LDO TD1 TD2 Applications Industrial Automation Equipment MAX14943 Programmable Logic Controllers LDO XFMR HVAC DRIVER V DDB Power Meters RE RXD A Safety Regulatory Approvals UL According to UL1577 TXD B cUL According to CSA Bulletin 5A DE DEM GNDA GNDB The PROFIBUS logo is a registered trademark of PROFIBUS and PROFINET International (PI). Ordering Information appears at end of data sheet. 19-7653 Rev 2 10/17 RS-485 TransceiverMAX14943 5kV Isolated 20Mbps Half-Duplex PROFIBUS DP/ RMS RS-485 Transceiver with 35kV ESD Protection and Integrated Transformer Driver Absolute Maximum Ratings V to GNDA .......................................................-0.3V to +6V Short-Circuit Duration (RXD to GNDA, A, B, DEM, DDA V to GNDB ........................................................-0.3V to +6V V to GNDB) ....................................................Continuous DDB DDB V to GNDB ......................................................-0.3V to +16V Continuous Power Dissipation (T = +70C) LDO A TD1, TD2 to GNDA ..............................................-0.3V to +12V 16-pin wide-body SOIC TXD, DE, RE to GNDA ...........................................-0.3V to +6V (derate 14.1mW/C above +70C) ..........................1126.8mW RXD to GNDA.........................................-0.3V to (V + 0.3V) Operating Temperature Range ......................... -40C to +105C DDA DEM to GNDB ........................................................-0.3V to +6V Junction Temperature ......................................................+150C A, B to GNDB ...........................................................-8V to +13V Storage Temperature Range ............................ -65C to +150C TD1, TD2 Continuous Current ...........................................1.4A Lead Temperature (soldering, 10s) .................................+300C Soldering Temperature (reflow) .......................................+260C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Package Thermal Characteristics (Note 1) Junction-to-Ambient Thermal Resistance ( ) ..............71C/W Junction-to-Case Thermal Resistance ( ) ...................23C/W JA JC Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial. DC Electrical Characteristics (V - V = 3.0V to 5.5V, V - V = 4.5V to 5.5V, T = T to T , unless otherwise noted. Typical values are at V DDA GNDA DDB GNDB A MIN MAX DDA - V = 3.3V, V - V = 5V, V = V , and T = +25C.) (Notes 2, 3) GNDA DDB GNDB GNDA GNDB A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS POWER V 3.0 5.5 DDA Supply Voltage V V 4.5 5.5 DDB V = 5V, DE = high, RE = TXD = DDA I low, RXD unconnected, no bus load, 4.7 7.7 DDA TD1/TD2 unconnected Supply Current mA DE = high, RE = TXD = low, RXD un- I 7.7 12.5 DDB connected, no bus load, V = 5V DDB RE, RXD, DE, TXD, V rising 1.50 1.58 1.65 DDA V Undervoltage-Lockout UVLOA TD1/TD2 driver, V rising 2.55 2.7 2.85 V DDA Threshold V V rising 2.55 2.7 2.85 UVLOB DDB RE, RXD, DE, TXD 50 V Undervoltage-Lockout UVHYSTA TD1/TD2 driver 200 mV Threshold Hysteresis V 200 UVHYSTB TRANSFORMER DRIVER Output Resistance R TD1/TD2 = low, I = 300mA 0.6 1.5 O OUT 4.5V V 5.5V 540 785 1300 DDA TD1, TD2 Current Limit I mA LIM 3.0V V 3.6V 485 730 1170 DDA Switching Frequency f 350 450 550 kHz SW Duty Cycle D 50 % Crossover Dead Time t 50 ns DEAD Maxim Integrated 2 www.maximintegrated.com