MAX14891E Quad Fault-Protected RS-485/RS-422 Receiver with Fault Detection General Description Benefits and Features The MAX14891E quad fault-protected RS-485/RS-422 High Flexibility Simplifies Design receiver is ideal for applications requiring high data rates Switching Rates up to 35Mbps and reduced noise in rugged environments. Each receiver 1.62V to 5.5V Logic Interface features a wide common-mode input range of -20V to Integrated Fault Detection Reduces Downtime +20V and is guaranteed to receive data at speeds up to Open-Wire and Short-Circuit Detection 35Mbps. Overvoltage and Undervoltage Fault Detection All receiver inputs are fault-protected against voltage Integrated Protection Ensures Robust shorts in the 40V range. Per-channel fault detection Communication provides warning of irregular conditions, such as short 40V Fault Protection Range circuits and open connections. 20V Common Mode Range The MAX14891E is available in a 20-pin TQFN-EP 25kV HBM ESD (4mm x 4mm) and operates over the -40C to +125C 7kV Air-Gap IEC 61000-4-2 ESD temperature range. 10kV Contact IEC 61000-4-2 ESD -40C to +125C Operating Temperature Range Applications Encoder Interfaces Ordering Information appears at end of data sheet. Motor Controllers Servo Control Commutation Typical Operating Circuit 3.3V to 5V 5V V VCC L ENCODER A AO RS-485/ RS-422 A RxA 120 A 5V AFAULT B BO RS-485/ RS-422 B RxB 120 B 5V BFAULT Z ASIC ZO RxZ RS-485/ RS-422 Z 120 5V Z ZFAULT Y YO RS-485/ RS-422 Y 120 RxY Y 5V YFAULT MAX14891E MOTOR CONTROLLER 19-7473 Rev 1 3/15MAX14891E Quad Fault-Protected RS-485/RS-422 Receiver with Fault Detection Absolute Maximum Ratings (All voltages referenced to GND) Continuous Power Dissipation (T = +70C) A V .........................................................................-0.3V to +6V TQFN (derate 25.6mW/C above +70C)..................2051mW CC V ............................................................-0.3V to (V + 0.3V) Operating Temperature Range ......................... -40C to +125C L CC AO, BO, ZO, YO ..........................................-0.3V to (V + 0.3V) Junction Temperature ......................................................+150C L AFAULT, BFAULT, ZFAULT, YFAULT, ....................-0.3V to +6V Storage Temperature Range ............................ -65C to +150C A, A, B, B, Z, Z, Y, Y .............................................-40V to +40V Lead Temperature (soldering, 10s) .................................+300C Short-Circuit Duration ( O, FAULT to GND) ...........Continuous 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 ( ) ..............39C/W Junction-to-Case Thermal Resistance ( ) .....................6C/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. Electrical Characteristics (V = 5V10%, V = 1.62V to V , T = -40C to +125C, unless otherwise noted. Typical values are at V = 5V, V = 3.3V, CC L CC A CC L T = +25C.) (Notes 2, 3) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS POWER SUPPLY Supply Voltage V 4.5 5.5 V CC Supply Current I Outputs not switching, no load 9 14 mA CC Logic Supply Voltage V 1.62 5.5 V L RS-485/RS-422 RECEIVERS (RxA, RxB, RxZ, RxY) Differential Threshold Voltage V -20V V +20V -200 +200 mV TH CM Differential Input Hysteresis V -20V V +20V 230 mV TH CM V = -10V -270 -170 IN Single-Ended Input Current I V = 0V or 5V A IN CC V = +10V +100 +160 IN V -20V V +20V, positive +270 +460 TH DFP CM Low Differential Voltage Fault mV Threshold V -20V V +20V, negative -460 -270 TH DFN CM Maxim Integrated 2 www.maximintegrated.com