EVALUATION KIT AVAILABLE MAX14852/MAX14854 2.75kV Isolated 500kbps/25Mbps Full-Duplex RMS RS-485/RS-422 Transceivers with 35kV ESD Protection General Description Benefits and Features The MAX14852/MAX14854 isolated RS-485/RS-422 High-Performance Transceiver Enables Flexible Designs transceivers provide 2750V (60s) of galvanic isola- Integrated LDO for Cable Side Power RMS tion between the cable side (RS-485/RS-422 driver/ Compliant with RS-485 EIA/TIA-485 Standard 500kbps (MAX14852)/25Mbps (MAX14854) Maximum receiver side) and the UART side of the device. Isolation improves communication by breaking ground loops and Data Rate Allows Up to 128 Devices on the Bus reduces noise when there are large differences in ground potential between ports. These devices allow for robust Integrated Protection Ensures for Robust Communication communication up to 500kbps (MAX14852) or 25Mbps 35kV ESD (HBM) on Driver Outputs/Receiver Inputs (MAX14854). 2.75kV Withstand Isolation Voltage for 60 RMS The devices include one drive channel and one receive Seconds (V ) ISO 630V Maximum Repetitive Peak-Isolation channel. The receiver is 1/4-unit load, allowing up to 128 PEAK Voltage (V ) transceivers on a common bus. IORM 445V Maximum Working-Isolation Voltage RMS Integrated true fail-safe circuitry ensures a logic-high on (V ) IOWM the receiver output when inputs are shorted or open. > 30 Years Lifetime at Rated Working Voltage Undervoltage lockout disables the driver when cable side Withstands 10kV Surge per IEC 61000-4-5 or UART-side power supplies are below functional levels. Thermal Shutdown The driver outputs and receiver inputs are protected Safety Regulatory Approvals Pending from 35kV electrostatic discharge (ESD) to GNDB on the cable side, as specified by the Human Body Model UL According to UL1577 (HBM). cUL According to CSA Bulletin 5A The MAX14852/MAX14854 are available in a wide-body Applications 16-pin SOIC package and operate over the -40C to Industrial Automation Equipment +105C temperature range. Programmable Logic Controllers HVAC Power Meters Functional Diagram Ordering Information appears at end of data sheet. VDDA VLDO MAX14852 MAX14854 LDO VDDB SBA RXD A RE B TXD Z Y DE GNDA GNDB 19-7965 Rev 1 1/17 RS-485 TRANSCEIVERMAX14852/MAX14854 2.75kV Isolated 500kbps/25Mbps Full-Duplex RMS RS-485/RS-422 Transceivers with 35kV ESD Protection Absolute Maximum Ratings V to GNDA .......................................................-0.3V to +6V Continuous Power Dissipation (T = +70C) DDA A V to GNDB ........................................................-0.3V to +6V 16-pin Wide SOIC DDB V to GNDB ......................................................-0.3V to +16V (derate 14.1mW/C above +70C) ..........................1126.8mW LDO TXD, DE, RE to GNDA ...........................................-0.3V to +6V Operating Temperature Range ......................... -40C to +105C SBA, RXD to GNDA ............................. -0.3V to (V + 0.3V) Junction Temperature ......................................................+150C DDA A, B, Z, Y to GNDB ..................................................-8V to +13V Storage Temperature Range ............................ -65C to +150C Short Circuit Duration (RXD, SBA to GNDA, Lead Temperature (soldering, 10s) .................................+300C A, B, Y, Z ,V to GNDB) ....................................Continuous Soldering Temperature (reflow) .......................................+260C DDB 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 = 1.71V to 5.5V, V V = 3.0V to 5.5V, T = T to T , unless otherwise noted. Typical values are at DDA GNDA DDB GNDB A MIN MAX V V = 3.3V, V V = 3.3V, V = V , and T = +25C.) (Notes 2, 3) DDA GNDA DDB GNDB GNDA GNDB A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS POWER V 1.71 5.5 DDA Supply Voltage V V 3.0 5.5 DDB V = 5V, DE = high, RE = TXD = low, DDA I 3.9 6.6 DDA RXD unconnected, no load Supply Current mA DE = high, RE = TXD = low, RXD uncon- I 7 12.5 DDB nected, no bus load, V = 3.3V DDB V V rising 1.50 1.58 1.65 Undervoltage Lockout Thresh- UVLOA DDA V old V V rising 2.55 2.7 2.85 UVLOB DDB V 50 Undervoltage Lockout Thresh- UVHYSTA mV old Hysteresis V 200 UVHYSTB LDO LDO Supply Voltage V Relative to GNDB, LDO is on (Note 4) 3.18 14 V LDO DE = high, TXD = low, no bus load, LDO Supply Current I 7.5 12.9 mA LDO V = 5.5V LDO LDO Output Voltage V 3.0 3.3 3.6 V DDB LDO Current Limit 300 mA Load Regulation V = 3.3V, I = 20mA to 40mA 0.19 1.7 mV/mA LDO LOAD Line Regulation V = 3.3V to 14V, I = 20mA 0.12 1.8 mV/V LDO LOAD Dropout Voltage V = 3.18V, I = -120mA 100 180 mV LDO DDB Maxim Integrated 2 www.maximintegrated.com