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1、General Description The MAX3535E/MXL1535E isolated RS-485/RS-422 full- duplex transceivers provide 2500VRMSof galvanic isola- tion between the RS-485/RS-422 side and the processor or control logic side. These devices allow fast, 1000kbps communication across an isolation barrier when the common-mode
2、 voltages (i.e., the ground potentials) on either side of the barrier are subject to large differences. Isolation is achieved through integrat- ed high-voltage capacitors. The MAX3535E/MXL1535E also feature a 420kHz transformer driver that allows power transfer to the RS-485 side using an external t
3、ransformer. The MAX3535E/MXL1535E include one differential driver, one receiver, and internal circuitry to send the RS-485 signals and control signals across the isolation barrier (including the isolation capacitors). The MAX3535E/ MXL1535E RS-485 receivers are 1/8 unit load, allowing up to 256 devi
4、ces on the same bus. The MAX3535E/MXL1535E feature true fail-safe circuitry. The driver outputs and the receiver inputs are protected from 15kV electrostatic discharge (ESD) on the inter- face side, as specified in the Human Body Model (HBM). The MAX3535E/MXL1535E feature driver slew-rate select tha
5、t minimizes electromagnetic interference (EMI) and reduces reflections. The driver outputs are short-cir- cuit and overvoltage protected. Other features are hot- swap capability and isolation-barrier fault detection. The MAX3535E operates with a single +3V to +5.5V power supply. The improved seconda
6、ry supply range of the MAX3535E allows the use of step-down transformers for +5V operation, resulting in considerable power sav- ings. The MXL1535E operates with a single +4.5V to +5.5V power supply. The MXL1535E is a function-/pin- compatible improvement of the LTC1535. The MAX3535E/MXL1535E are av
7、ailable over the commer- cial 0C to +70C and extended -40C to +85C temper- ature ranges. ApplicationsIsolated RS-485 SystemsSystems with Large Common-Mode VoltagesIndustrial-Control Local Area NetworksTelecommunications SystemsFeatures 2500VRMSRS-485 Bus Isolation Using On-Chip High-Voltage Capacito
8、rs 1000kbps Full-Duplex RS-485/RS-422 Communication +3V to +5.5V Power-Supply Voltage Range (MAX3535E) +4.5V to +5.5V Power-Supply Voltage Range (MXL1535E) 1/8 Unit Receiver Load, Allowing 256 Devices on Bus 15kV ESD Protection Using HBM Pin-Selectable Slew-Rate Limiting Controls EMI Hot-Swap-Protec
9、ted Driver-Enable Input Undervoltage Lockout Isolation-Barrier Fault Detection Short-Circuit Protected Thermal Shutdown Open-Line and Shorted-Line Fail-Safe Receiver InputsMAX3535E/MXL1535E+3V to +5V, 2500VRMSIsolated RS-485/RS-422 Transceivers with 15kV ESD Protection_ Maxim Integrated Products1282
10、7262518171615123411121314RO1REDEDIBSLORO2AVCC2PINS 510 and 1924 ARE REMOVED FROM THE PACKAGEYZGND2GND1ST2ST1VCC1WIDE SOTOP VIEWMAX3535E MXL1535EPARTTEMP RANGEPIN- PACKAGEPOWER- SUPPLY RANGE (V)MAX3535ECWI0C to +70C28 Wi d e S O+ 3.0 to + 5.5MAX3535EEWI-40C to +85C 28 Wi d e S O+ 3.0 to + 5.5MXL1535E
11、CWI0C to +70C28 Wi d e S O+ 4.5 to + 5.5MXL1535EEWI-40C to +85C 28 Wi d e S O+ 4.5 to + 5.5Pin ConfigurationOrdering Information19-3270; Rev 0; 4/04For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxims website at www.maxim-.Typical Ap
12、plication Circuit appears at end of data sheet.MAX3535E/MXL1535E+3V to +5V, 2500VRMSIsolated RS-485/RS-422 Transceivers with 15kV ESD Protection2_ABSOLUTE MAXIMUM RATINGSDC ELECTRICAL CHARACTERISTICS TABLE (MAX3535E)(VCC1= +3.0V to +5.5V, VCC2= +3.13V to +7.5V, TA= -40C to +85C, unless otherwise not
13、ed. Typical values are at VCC1= +3.3V, VCC2= +5V, TA= +25C.)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 ope
14、rational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Logic SideAll Voltages Referenced to GND1. VCC1.-0.3V to +6V RE, DE, DI.-0.3V to +6V RO1, ST1, ST2.-0.3V to (VCC1+ 0.3V) Isolated SideAll Voltages Referenced to GND2. VCC2.-0.3V to +8V SLO.-0.3V to (VCC2+ 0.3V) A, B.14V RO2 .-0.3V to the lower of (VCC2+ 0.3V) and +3.4V Y, Z.
