MAX1482/MAX1483 19-0367 Rev 1 5/06 1 20A, -Unit-Load, Slew-Rate-Limited 8 RS-485 Transceivers General Description Features The MAX1482 and MAX1483 are low-power trans- Low 20A Operating Current ceivers for RS-485 and RS-422 communication. Both Slew-Rate Limited for Reduced EMI and feature slew-rate-limited drivers that minimize EMI and Reduced Reflections reduce reflections caused by improperly terminated cables. Data rates are guaranteed up to 250kbps. 0.1A Low-Current Shutdown Mode The MAX1482/MAX1483 draw only 20A of supply cur- Designed for RS-485 and RS-422 Applications rent. Additionally, they have a low-current shutdown mode that consumes only 0.1A. Both parts operate Operate from a Single +5V Supply from a single +5V supply. -7V to +12V Common-Mode Input Voltage Range Drivers are short-circuit current limited and are protect- Allows up to 256 Transceivers on the Bus ed against excessive power dissipation by thermal 1 Guaranteed ( -unit load) shutdown circuitry that places the driver outputs into a 8 high-impedance state. The receiver input has a fail-safe Current Limiting and Thermal Shutdown for feature that guarantees a logic-high output if the input Driver Overload Protection is open circuit. Ordering Information The MAX1482 is full duplex and the MAX1483 is half 1 duplex. Both parts have a -unit-load input impedance 8 PKG PART TEMP RANGE PIN-PACKAGE that guarantees up to 256 transceivers on the bus. CODE Applications MAX1482CPD 0C to +70C 14 PDIP P14-3 MAX1482CSD 0C to +70C 14 SO S14-4 Low-Power RS-485/RS-422 Networks MAX1482EPD -40C to +85C 14 PDIP P14-3 Transceivers for EMI-Sensitive Applications MAX1482ESD -40C to +85C 14 SO S14-4 Industrial-Control Local Area Networks MAX1483CPA 0C to +70C 8 PDIP P8-1 Large 256-Node LANs MAX1483CSA 0C to +70C 8 SO S8-5 MAX1483CUA 0C to +70C 8 MAX U8-1 MAX1483EPA -40C to +85C 8 PDIP P8-1 MAX1483ESA -40C to +85C 8 SO S8-5 Pin Configurations Typical Operating Circuits TOP VIEW RO 1 R 8 V CC RE 2 7 B +5V DE 3 DE 6 A MAX1483 DI R RO 1 8 V CC D 4 D DI 5 GND B B 7 RE 2 Rt Rt 6 DIP/SO 3 DE A A RO R 4 DI D 5 GND B 1 A 8 RE V CC 2 7 MAX1483 GND RO 3 6 DI NOTE: PIN LABELS Y AND Z ON TIMING, TEST, AND WAVEFORM RE 4 DE 5 DIAGRAMS REFER TO PINS A AND B WHEN DE IS HIGH. TYPICAL OPERATING CIRCUIT SHOWN WITH DIP/SO PACKAGE. MAX MAX1482 appears at end of data sheet. MAX1482 appears at end of data sheet. MAX is a registered trademark of Maxim Integrated products, Inc. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.1 20A, -Unit-Load, Slew-Rate-Limited 8 RS-485 Transceivers ABSOLUTE MAXIMUM RATINGS Supply Voltage (V )...............................................................7V 8-Pin SO (derate 5.88mW/C above +70C)..................471mW CC Control Input Voltages (RE, DE) .................-0.5V to (V + 0.5V) 14-Pin SO (derate 8.33mW/C above +70C)................667mW CC Driver Input Voltage (DI).............................-0.5V to (V + 0.5V) 8-Pin MAX (derate 4.10mW/C above +70C) .............330mW CC Driver Output Voltages ..........................................-7.5V to 12.5V Operating Temperature Ranges Receiver Input Voltages (A, B) ..............................-7.5V to 12.5V MAX148 C .......................................................0C to +70C Receiver Output Voltage (RO)....................-0.5V to (V + 0.5V) MAX148 E .....................................................-40C to +85C CC Continuous Power Dissipation (T = +70C) Storage Temperature Range .............................-65C to +160C A 8-Pin Plastic DIP (derate 9.09mW/C above +70C) .....727mW Lead Temperature (soldering, 10sec) .............................+300C 14-Pin Plastic DIP (derate 10.00mW/C above +70C) .800mW 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 (V = 5V 5%, T = T to T , unless otherwise noted. Typical values are at T = +25C.) (Note 1) CC A MIN MAX A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Differential Driver Output (no load) V 5 V OD1 R = 50 (RS-422), Figure 1 25 Differential Driver Output V V OD2 (with load) R = 27 (RS-485), Figure 1 1.5 5 Change in Magnitude of Driver Differential Output Voltage for V R = 27 or 50 , Figure 1 0.2 V OD Complementary Output States Driver Common-Mode Output V R = 27 or 50 , Figure 1 3 V OC Voltage Change in Magnitude of Driver Common-Mode Output Voltage V R = 27 or 50 , Figure 1 0.2 V OD for Complementary Output States Three-State (high impedance) MAX1482 only, I 50 A OZD Output Current at Driver -7V < V V < 12V Y and Z Logic Input High Voltage V DE, DI, RE 2.0 V IH Logic Input Low Voltage V DE, DI, RE 0.8 V IL Logic Input Current I DE, DI, RE 2 A IN1 V = 12V 150 IN MAX1482, DE = 0V, V = 0V or 5.25V CC V = -7V -100 Input Current IN I A IN2 (A, B) V = 12V 200 IN MAX1483, DE = 0V, V = 0V or 5.25V CC V = -7V -150 IN Receiver Differential Threshold V -7V V 12V -0.2 0.2 V TH CM Voltage Receiver Input Hysteresis V V = 0V 75 mV TH CM Receiver Output High Voltage V I = -4mA, V = 200mV 3.5 V OH O ID Receiver Output Low Voltage V I = 4mA, V = -200mV 0.4 V OL O ID Three-State (high impedance) I 0.4V V 2.4V 1 A OZR O Output Current at Receiver Receiver Input Resistance R -7V V 12V 96 k IN CM Note 1: All currents into device pins are positive all currents out of device pins are negative. All voltages are referenced to device ground unless otherwise specified. 2 MAX1482/MAX1483