EVALUATION KIT AVAILABLE MAX3535E/MXL1535E +3V to +5V, 2500V Isolated RS-485/RS-422 RMS Transceivers with 15kV ESD Protection General Description Features 2500V RS-485 Bus Isolation Using On-Chip The MAX3535E/MXL1535E isolated RS-485/RS-422 full- RMS High-Voltage Capacitors duplex transceivers provide 2500V of galvanic isola- RMS tion between the RS-485/RS-422 side and the processor 1000kbps Full-Duplex RS-485/RS-422 Communication or control logic side. These devices allow fast, 1000kbps communication across an isolation barrier +3V to +5.5V Power-Supply Voltage Range when the common-mode voltages (i.e., the ground (MAX3535E) potentials) on either side of the barrier are subject to +4.5V to +5.5V Power-Supply Voltage Range large differences. Isolation is achieved through integrat- (MXL1535E) ed high-voltage capacitors. The MAX3535E/MXL1535E 1/8 Unit Receiver Load, Allowing 256 Devices on also feature a 420kHz transformer driver that allows Bus power transfer to the RS-485 side using an external 15kV ESD Protection Using HBM transformer. Pin-Selectable Slew-Rate Limiting Controls EMI The MAX3535E/MXL1535E include one differential driver, Hot-Swap-Protected Driver-Enable Input one receiver, and internal circuitry to send the RS-485 Undervoltage Lockout signals and control signals across the isolation barrier (including the isolation capacitors). The MAX3535E/ Isolation-Barrier Fault Detection MXL1535E RS-485 receivers are 1/8 unit load, allowing Short-Circuit Protected up to 256 devices on the same bus. Thermal Shutdown The MAX3535E/MXL1535E feature true fail-safe circuitry. Open-Line and Shorted-Line Fail-Safe Receiver The driver outputs and the receiver inputs are protected Inputs from 15kV electrostatic discharge (ESD) on the inter- face side, as specified in the Human Body Model (HBM). Ordering Information Ordering Information The MAX3535E/MXL1535E feature driver slew-rate select that minimizes electromagnetic interference (EMI) POWER- and reduces reflections. The driver outputs are short-cir- SUPPLY PIN- PART TEMP RANGE cuit and overvoltage protected. Other features are hot- PACKAGE RANGE swap capability and isolation-barrier fault detection. (V) MAX3535ECWI 0C to +70C 28 Wid e S O + 3.0 to +5.5 The MAX3535E operates with a single +3V to +5.5V power supply. The improved secondary supply range of + 3.0 to +5.5 MAX3535EEWI -40C to +85C 28 Wid e S O Functional Diagrams the MAX3535E allows the use of step-down transformers + 4.5 to +5.5 MXL1535ECWI 0C to +70C 28 Wid e S O for +5V operation, resulting in considerable power sav- MXL1535EEWI -40C to +85C 28 Wid e S O+4. 5 to +5.5 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 Pin Configuration MAX3535E/MXL1535E are available over the commer- cial 0C to +70C and extended -40C to +85C temper- TOP VIEW V 1 28 RO1 ature ranges. CC1 ST1 2 27 RE Applications ST2 3 26 DE GND1 4 25 DI Isolated RS-485 Systems Systems with Large Common-Mode Voltages Industrial-Control Local Area Networks MAX3535E MXL1535E Telecommunications Systems GND2 11 18 SLO Z 12 17 RO2 Y 13 16 A Typical Application Circuit appears at end of data sheet. Pin Configurations appear at end of data sheet. VCC2 14 15 B Functional Diagrams continued at end of data sheet. WIDE SO PINS 510 and 1924 ARE REMOVED FROM THE PACKAGE UCSP is a trademark of Maxim Integrated Products, Inc. For pricing, delivery, and ordering information, please contact Maxim Direct 19-3270 Rev 0 4/04 at 1-888-629-4642, or visit Maxims website at www.maxim integrated.com. AVAILABLEMAX3535E/MXL1535EMAX3535E/MXL1535E +3V to +5V, 2500V Isolated RS-485/RS-422 RMS Transceivers with 15kV ESD Protection ABSOLUTE MAXIMUM RATINGS Logic SideAll Voltages Referenced to GND1. Y, Z Maximum Current.............................Short-Circuit Protected V .........................................................................-0.3V to +6V ST1, ST2 Maximum Current............................................300mA CC1 RE, DE, DI.................................................................-0.3V to +6V Continuous Power Dissipation (T = +70C) A RO1, ST1, ST2 ..........................................-0.3V to (V + 0.3V) 28-Pin Wide SO CC1 Isolated SideAll Voltages Referenced to GND2. (derate 9.5mW/C above +70C).................................750mW V .........................................................................-0.3V to +8V Operating Temperature Range CC2 SLO...........................................................-0.3V to (V + 0.3V) MXL1535ECWI, MAX3535ECWI .........................0C to +70C CC2 A, B ......................................................................................14V MXL1535EEWI, MAX3535EEWI.......................-40C to +85C RO2 .....................-0.3V to the lower of (V + 0.3V) and +3.4V Junction Temperature......................................................+150C CC2 Y, Z ............................................................................-8V to +13V Storage Temperature Range .............................-65C to +150C Digital Outputs Maximum Current Lead Temperature (soldering, 10s) .................................+300C RO1, RO2 .....................................................................20mA 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. DC ELECTRICAL CHARACTERISTICS TABLE (MAX3535E) (V = +3.0V to +5.5V, V = +3.13V to +7.5V, T = -40C to +85C, unless otherwise noted. Typical values are at V = +3.3V, CC1 CC2 A CC1 V = +5V, T = +25C.) CC2 A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS LOGIC-SIDE SUPPLY (V , GND1) CC1 Logic-Side Supply Voltage V 3.0 5.5 V CC1 Transformer not driven, ST1 and ST2 Logic-Side Supply Current I unconnected, RE = low, DE = high, 5.9 13 mA CC1 f = 0, RO1 = no load DATA V Undervoltage-Lockout CC1 V 2.53 2.69 2.85 V UVL1 Falling Trip V Undervoltage-Lockout CC1 V 2.63 2.80 2.97 V UVH1 Rising Trip LOGIC INPUTS (DI, DE, RE) Input High Voltage, DE, DI, RE V V is measured with respect to GND1 2.0 V IH IH Input Low Voltage, DE, DI, RE V V is measured with respect to GND1 0.8 V IL IL Logic-Side Input Current, DE, DI I 2A INC LOGIC OUTPUTS (RO1, RE) I = 4mA, V = +4.5V 3.7 Receiver-Output High Voltage SOURCE CC1 V V RO1H (RO1) I = 4mA, V = +3V 2.4 SOURCE CC1 I = 4mA, V = +4.5V 0.4 SINK CC1 Receiver-Output Low Voltage V V RO1L (RO1) I = 4mA, V = +3V 0.4 SINK CC1 Receiver-Output (RO1) Leakage RE = high, V = +5.5V, CC1 I 1 A OZR Current 0 V V RO1 CC1 RE Low Output Current for Fault I RE = +0.4V, fault not asserted 40 60 80 A OL Detect 2 Maxim Integrated