EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. MAX22025MAX22028/ Compact, Isolated, Half-Duplex RS-485/RS-422 MAX22025FMAX22028F Transceivers with AutoDirection Control General Description Benefits and Features The MAX22025MAX22028/MAX22025FMAX22028F High-Level Integration Reduces Overall Solution Size compact isolated RS-485/RS-422 transceivers provide Fully Isolated Half-Duplex RS-485/RS-422 3.5kV of digital galvanic isolation between the RMS Transceivers cable-side (RS-485/RS-422 driver/ receiver-side) and the Compact 8-Pin Wide Body SOIC Package (5.5mm UART-side of the device. Isolation improves communica- Creepage) tion by breaking ground loops and reduces noise when Integrated Protection Ensures Robust Communication there are large differences in ground potential between 10kV ESD (HBM) on Driver Outputs/Receiver Inputs ports. These devices allow for robust communication up Failsafe Receiver Prevents Fault Transition on to 0.5Mbps or 16Mbps. Receiver Input Short or Open Events (MAX22025F The MAX22025MAX22028/MAX22025FMAX22028F MAX22028F) feature Maxims proprietary AutoDirection control mak- Withstands 3.5kV Isolation Voltage for RMS ing these devices ideal for applications such as isolated 60 Seconds (V ) ISO RS-485 ports, where the driver input is used in conjuction Withstands 630V Maximum Repetitive Peak- PEAK with the driver-enable signal to drive the differential bus. Isolation Voltage (V ) IORM Continuously Withstands 445V Maximum RMS The MAX22025/MAX22027/MAX22025F/MAX22027F Working-Isolation Voltage (V ) IOWM feature reduced slew rate drivers that minimize EMI and reduce reflections caused by improper termination of Enables Flexible System Design cable allowing error-free transmission up to 0.5Mbps. 0.5Mbps Maximum Data Rate with Slew-Rate Limited The MAX22026/MAX22028/MAX22026F/MAX22028F Driver (MAX22025/MAX22027/MAX22025F/ driver outputs are not slew-rate limited, allowing MAX22027F) transmit speeds up to 16Mbps. 16Mbps Maximum Data Rate (MAX22026/MAX22028/ MAX22026F/MAX22028F) The receiver output of the MAX22025/MAX22026/ AutoDirection Eliminates the Need for DE and RE MAX22025F/MAX22026F does not follow (V -V ) when A B Control Signals the device is in the driver-enabled state. The receiv- er output on the MAX22027/MAX22028/MAX22027F/ Safety Regulatory Approvals MAX22028F always follows (V -V ). A B UL According to UL1577 The driver outputs and receiver inputs are protected from cUL According to CSA Bulletin 5A 10kV electrostatic discharge (ESD) to GNDB on the cable side, as specified by the Human Body Model (HBM). Functional Diagram The MAX22025MAX22028/MAX22025FMAX22028F are available in a compact 8-pin wide body SOIC package and operate over the -40C to +85C temperature range. VDDA VDDB Applications Utility Meters RXD V DT Industrial Automation Equipment MAX22025 COM B B MAX22028 Programmable Logic Controllers STATE MACHINE A MAX22025F A HVAC MAX22028F TXD Ordering Information appears at end of data sheet. GNDA GNDB 19-100636 Rev 4 4/20 RS-485 TRANSCEIVERMAX22025MAX22028/ Compact, Isolated, Half-Duplex RS-485/RS-422 MAX22025FMAX22028F Transceivers with AutoDirection Control Absolute Maximum Ratings V , TXD to GNDA ..............................................-0.3V to +6V Continuous Power Dissipation (T = +70C) DDA A V to GNDB ........................................................-0.3V to +6V 8-pin Wide SOIC (derate 23mW/C above +70C) ...1847mW DDB RXD to GNDA .......................................-0.3V to (V + 0.3V) Operating Temperature Range ........................... -40C to +85C DDA A, B to GNDB ...........................................................-8V to +13V Junction Temperature ......................................................+150C Short Circuit Duration (RXD to GNDA) .....................Continuous Storage Temperature Range ............................ -65C to +150C Short Circuit Duration (A, B to GNDB) ......................Continuous 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 Information PACKAGE TYPE: 8 Wide SOIC Package Code W8MS+1 Outline Number 21-0262 Land Pattern Number 90-0258 THERMAL RESISTANCE, FOUR-LAYER BOARD Junction to Ambient ( ) 43.3C/W JA Junction to Case ( ) 36.5C/W JC 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. 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. DC Electrical Characteristics (V V = 1.71V to 5.5V, V V = 4.75V to 5.25V, T = T to T , unless otherwise noted. Typical values are at DDA GNDA DDB GNDB A MIN MAX V V = 3.3V, V V = 5V, V = V , and T = +25C.) (Notes 1, 2) 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 4.75 5.25 DDB V = 3.3V, RXD is unconnected, DDA I 0.39 0.7 DDA TXD = low, no bus load Supply Current mA V = 5V, RXD is unconnected, DDB I 4.0 5.5 DDB TXD = low, no bus load V Undervoltage Lockout DDA V V rising 1.5 1.6 1.66 V UVLOA DDA Threshold V Undervoltage Lockout DDA V 45 mV UVHYSTA Threshold Hysteresis LOGIC INTERFACE (TXD, RXD) 0.7 x 2.25V V 5.5V DDA V DDA Input High Voltage V TXD to GNDA V IH 0.75 x 1.71V V < 2.25V DDA V DDA Maxim Integrated 2 www.maximintegrated.com