Click here for production status of specific part numbers. MAX14890E Incremental Encoder Interface for RS-422, HTL, and TTL with Digital Inputs General Description Benefits and Features The MAX14890E incremental encoder receiver contains High Flexibility Supports All Encoder Types four differential receivers and two single-ended receivers. Selectable RS-422/HTL/TTL/DI Receivers RS-422 Switching Rates Up to 35Mbps The differential receivers can be operated in RS-422 or TTL Switching Rates Up to 5MHz differential high-threshold logic (HTL) modes and are HTL Switching Rates Up to 400kHz optionally configurable for single-ended TTL/HTL operation. SPI or Pin-Controlled Operation The MAX14890E features a wide common mode input SPI Interface Allows Per-Receiver Configuration range of -20V to +20V in RS-422 mode. 1.62V to 5.5V Logic Interface The auxiliary IEC 61131-2 Type-1/Type-3 digital inputs Integrated Fault Detection Reduces Down-Time are designed for operation with switches or proximity Open-Wire and Short-Circuit Detection sensors and can be individually configured for TTL operation. Overvoltage and Undervoltage Fault Detection All receiver input signals are fault protected to voltage shorts Integrated Protection Ensures Robust in the 40V range. Per channel fault detection provides Communication warning of irregular conditions such as small differential 40V Fault Protection Range signals, shorts, opens, overvoltages, and undervoltages. 20V RS-422 Common Mode Range The MAX14890E features a pin-selectable SPI or parallel- DI Glitch Filters logic interface. SPI control provides detailed diagnostics 25kV HBM ESD and individual configurations for receivers. 7kV Air-Gap per IEC 61000-4-2 ESD 10kV Contact per IEC 61000-4-2 ESD The MAX14890E is available in a 32-pin TQFN-EP (5mm -40C to +125C Operating Temperature Range x 5mm) and operates over the -40C to +125C tempera- ture range. Applications Encoder Interfaces Ordering Information appears at end of data sheet. Motor Controllers Pulse Counters Typical Operating Circuit Servo Control Commutation 3.3V to 5V 5V Input Receiver Modes V V CC L ENCODER A MODE RxA RxB RxZ RxY RxDI2 RxDI3 AO RxA RS-422 A 120 A 5V AFAULT RS-422 B BO RxB RS-422 B 120 B 5V D-HTL BFAULT Z SE-HTL ZO RS-422 Z 120 RxZ 5V Z ZFAULT TTL DIY YO TTL ALARM RxY ASIC DI 5V YFAULT DO DI2 LO2 PROXIMITY RxD2 SENSOR DO DI3 LO3 PROXIMITY RxD3 SENSOR SNGL/CLK = 0 TTL/SDI = 1 DI/TTLY = 1 MAX14890 DI/TTL2 = 1 DI/TTL3 = 1 COUNTER/ MOTOR CONTROLLER ENCODER CIRCUIT WITH RS-422 SIGNALS AND TTL ALARM SIGNAL 19-7536 Rev 2 5/20MAX14890E Incremental Encoder Interface for RS-422, HTL, and TTL with Digital Inputs Absolute Maximum Ratings (All voltages referenced to GND) Short-Circuit Duration ( O, FAULT, LO2, V ..........................................................................-0.3V to +6V D2FAULT/IRQ, LO3, D3FAULT/SDO to GND) .....Continuous CC V ............................................................-0.3V to (V + 0.3V) Continuous Power Dissipation (T = +70C) L CC A AO, BO, ZO, YO, LO, LO2, LO3 .................-0.3V to (V + 0.3V) Thin QFN (derate 19mW/C above +70C) ...............1520mW L FAULT, D2FAULT/IRQ ...........................................-0.3V to +6V Operating Temperature Range ......................... -40C to +125C D3FAULT/ SDO (SPI is High) ......................-0.3V to (V + 0.3V) Junction Temperature ......................................................+150C L D3FAULT/SDO (SPI is Low) ..................................-0.3V to +6V Storage Temperature Range ............................ -65C to +150C TTL/SDI, SNGL/SCLK, HITH/CS, DI/TTLY, Lead Temperature (Soldering, 10s) .................................+300C DI/TTL2, DI/TTL3, SPI ........................................-0.3V to +6V Soldering Temperature (Reflow) ......................................+260C A, A, B, B, Z, Z, DIY, Y, DI2, DI3............................-40V to +40V 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 Information 32 TQFN Package Code T3255+6 Outline Number 21-0140 Land Pattern Number 90-0603 THERMAL RESISTANCE, FOUR-LAYER BOARD Junction to Ambient ( ) 36C/W JA Junction to Case ( ) 3C/W JC For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a +, , or - in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. 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. Maxim Integrated 2 www.maximintegrated.com