EVALUATION KIT AVAILABLE MAX14948 5kV Isolated 500kbps Half-Duplex RS-485/ RMS RS-422 Transceiver with 30kV ESD Protection Benefits and Features General Description The MAX14948 isolated RS-485/RS-422 transceiver High-Performance Transceiver Enables Flexible Designs Integrated LDO for Cable-Side Power provides 5000V (60s) of galvanic isolation between RMS Compliant with RS-485/EIA-485 Standard the cable-side (RS-485/RS-422 driver/receiver side) 500kbps Maximum Data Rate and the UART-side of the device. Isolation improves Allows Up to 256 Devices on the Bus communication by breaking ground loops and reduces noise when there are large differences in ground potential Integrated Protection Ensure Robust Communication between ports. This device allows for robust communication 30kV ESD (HBM) on Driver Outputs/Receiver Inputs 5kV Withstand Isolation Voltage for 60s (V ) up to 500kbps. RMS ISO 1200V Maximum Repetitive Peak-Isolation PEAK The MAX14948 includes one half-duplex drive/receive Voltage (V ) IORM channel. The receiver is 1/8-unit load, allowing up to 256 848V Maximum Working-Isolation Voltage (V ) RMS IOWM transceivers on a common bus. > 30 Years Lifetime at Rated Working Voltage Integrated true fail-safe circuitry ensures a logic-high on Withstands 10kV Surge per IEC 61000-4-5 the receiver output when inputs are shorted or open. Thermal Shutdown Undervoltage lockout disables the driver when cable-side Safety Regulatory Approvals or UART-side power supplies are below functional levels. UL According to UL1577 The driver outputs/receiver inputs are protected from cUL According to CSA Bulletin 5A 30kV electrostatic discharge (ESD) to GNDB on the cable side, as specified by the Human Body Model (HBM). Applications The MAX14948 is available in a wide body 16-pin SO package Industrial Automation Equipment and operates over the -40C to +85C temperature range. Programmable Logic Controllers HVAC Power Meters Ordering Information/Selector Guide appears at end of data sheet. Functional Diagram VDDA VLDO MAX14948 LDO VDDB SBA RE RXD A TXD B DE GNDA GNDB 19-7968 Rev 1 1/17 RS-485 TRANSCEIVERMAX14948 5kV Isolated 500kbps Half-Duplex RS-485/ RMS RS-422 Transceiver with 30kV 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 W 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 +85C SBA, RXD to GNDA ............................. -0.3V to (V + 0.3V) Junction Temperature ......................................................+150C DDA A, B 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, 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 = 4.5V to 5.5V, T = T to T , unless otherwise noted. Typical values are DDA GNDA DDB GNDB A MIN MAX at V V = 3.3V, V V = 5V, 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 4.5 5.5 DDB V = 5V, DE = high, RE = TXD = DDA I 4 6.6 DDA low, RXD unconnected, no bus load Supply Current mA DE = high, RE = TXD = low, RXD un- I 6.3 12.5 DDB connected, no bus load, V = 5V DDB V V rising 1.50 1.58 1.65 UVLOA DDA Undervoltage-Lockout Threshold V V V rising 2.55 2.7 2.85 UVLOB DDB V 50 Undervoltage-Lockout UVHYSTA mV Threshold Hysteresis V 200 UVHYSTB LDO LDO Supply Voltage V Relative to GNDB, LDO is on (Note 4) 4.68 14 V LDO DE = high, RE = TXD = low, no bus LDO Supply Current I 6.5 12.9 mA LDO load, V = 5.5V LDO LDO Output Voltage V 4.5 5 5.5 V DDB LDO Current Limit 300 mA Load Regulation V = 5.68V, I = 20mA to 40mA 0.19 1.7 mV/mA LDO LOAD Line Regulation V = 5.68V to 14V, I = 20mA 0.12 1.8 mV/V LDO LOAD Dropout Voltage V = 4.68V, I = -120mA 100 180 mV LDO DDB Maxim Integrated 2 www.maximintegrated.com