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MAX3461 Dataheets PDF



Part Number MAX3461
Manufacturers Maxim
Logo Maxim
Description +5V / Fail-Safe / 20Mbps / Profibus RS-485/ RS-422 Transceivers
Datasheet MAX3461 DatasheetMAX3461 Datasheet (PDF)

19-2217; Rev 1; 2/03 +5V, Fail-Safe, 20Mbps, Profibus RS-485/ RS-422 Transceivers General Description The MAX3460–MAX3464 are high-speed differential bus transceivers for RS-485 and RS-422 communications. They are designed to meet TIA/EIA-422-B, TIA/EIA-485-A, V.11, and X.27 standards. The transceiver complies with the Profibus specification providing +2.1V output level with a 54Ω load, 20Mbps data rate, and output skew less than 2ns. Each part contains one three-state differential line driver .

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19-2217; Rev 1; 2/03 +5V, Fail-Safe, 20Mbps, Profibus RS-485/ RS-422 Transceivers General Description The MAX3460–MAX3464 are high-speed differential bus transceivers for RS-485 and RS-422 communications. They are designed to meet TIA/EIA-422-B, TIA/EIA-485-A, V.11, and X.27 standards. The transceiver complies with the Profibus specification providing +2.1V output level with a 54Ω load, 20Mbps data rate, and output skew less than 2ns. Each part contains one three-state differential line driver and one differential input line receiver. The devices operate from a +5V supply and feature true fail-safe circuitry, which guarantees a logic-high receiver output when the receiver inputs are open or shorted. This enables all receiver outputs on a terminated bus to output logic highs when all transmitters are disabled. All devices feature a 1/4 standard unit load receiver input impedance that allows 128 transceivers on the bus. Driver and receiver propagation delays are guaranteed under 20ns for multidrop, clock distribution applications. Drivers are short-circuit current limited and are protected against excessive power dissipation by thermal shutdown circuitry. The driver and receiver feature active-high and active-low enables, respectively, that can be connected together externally to serve as a direction control. o Guaranteed 20Mbps Data Rate o 20ns Transmitter and Receiver Propagation Delay o 2ns Transmitter and Receiver Skew o High Differential Driver Output Level (2.1V on 54Ω) o Hot-Swap Versions o 1µA Shutdown Supply Current o Low Supply Current Requirements (2.5mA typ) o Allow Up to 128 Transceivers on the Bus o True Fail-Safe Receiver while Maintaining EIA/TIA485 Compatibility o Designed for Multipoint Transmissions on Long or Noisy Bus Lines o Full Duplex and Half Duplex Versions Available o Phase Controls to Correct for Twisted-Pair Reversal for 14-Pin Versions o Current-Limiting and Thermal Shutdown for Driver Overload Protection Features o Recommended for Profibus Applications MAX3460–MAX3464 Applications High-Speed RS-485 Communications High-Speed RS-422 Communications Level Translators Industrial-Control Local Area Networks Profibus Applications PART MAX3460CSD MAX3460CPD MAX3460ESD MAX3460EPD Ordering Information TEMP RANGE 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C PIN-PACKAGE 14 SO 14 Plastic DIP 14 SO 14 Plastic DIP Ordering Information continued at end of data sheet. Pin Configurations appear at end of data sheet. Selector Guide PART NUMBER MAX3460 MAX3461 MAX3462 MAX3463 MAX3464 HALF/FULL DUPLEX Full Full Full Half Half RECEIVER/ DRIVER ENABLE Yes Yes No Yes Yes LOWPOWER SHUTDOWN Yes Yes No Yes Yes HOT SWAP Yes No No Yes No RECEIVER/ DRIVER PHASE SELECT Yes Yes No No No INDEPENDENT SHDN PIN Yes Yes No No No PIN COUNT 14 14 8 8 8 ________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. +5V, Fail-Safe, 20Mbps, Profibus RS-485/ RS-422 Transceivers MAX3460–MAX3464 ABSOLUTE MAXIMUM RATINGS Supply Voltage (VCC) to GND ..................................-0.3V to +6V Control Input Voltage (RE, DE, DI, SHDN, TXP, RXP) to GND....................................................-0.3V to (VCC + 0.3V) Driver Output Voltage (Y, Z) to GND .........................-8V to +13V Receiver Input Voltage (A, B) to GND.......................-8V to +13V Differential Driver Output Voltage (Y - Z) ...............................±8V Differential Receiver Input (A - B) ..........................................±8V Receiver Output Voltage (RO) to GND.......-0.3V to (VCC + 0.3V) Output Driver Current (Y, Z) ...........................................±250mA Continuous Power Dissipation (TA = +70°C) 8-Pin SO (derate 5.88mW/°C above +70°C)................471mW 8-Pin DIP (derate 9.09mW/°C above +70°C) ...............727mW 14-Pin SO (derate 8.33mW/°C above +70°C)..............667mW 14-Pin DIP (derate 10mW/°C above +70°C) ................800mW Operating Temperature Range MAX346_C__ ......................................................0°C to +70°C MAX346_E__....................................................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C 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. ELECTRICAL CHARACTERISTICS (VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical.


MAX3460 MAX3461 MAX3462


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