Features: ` Recommended for Profibus Applications
` Guaranteed 20Mbps Data Rate
` 20ns Transmitter and Receiver Propagation Delay
` 2ns Transmitter and Receiver Skew
` High Differential Driver Output Level (2.1V on 54)
` Hot-Swap Versions
` 1A Shutdown Supply Current
` Low Supply Current Requirements (2.5mA typ)
` Allow Up to 128 Transceivers on the Bus
` True Fail-Safe Receiver while Maintaining EIA/TIA-485 Compatibility
` Designed for Multipoint Transmissions on Long or Noisy Bus Lines
` Full Duplex and Half Duplex Versions Available
` Phase Controls to Correct for Twisted-Pair Reversal for 14-Pin Versions
` Current-Limiting and Thermal Shutdown for Driver Overload ProtectionApplication·High-Speed RS-485 Communications
·High-Speed RS-422 Communications
·Level Translators
·Industrial-Control Local Area Networks
·Profibus ApplicationsPinout
SpecificationsSupply 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.
DescriptionThe MAX3464 are high-speed differential bus transceivers for RS-485 and RS-422 communications. MAX3464 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 54 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 MAX3464 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.
MAX3464 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 of MAX3464 are short-circuit current limited and are protected against excessive power dissipation by thermal shutdown circuitry. The driver and receiver MAX3464 feature active-high and active-low enables, respectively, that can be connected together externally to serve as a direction control.
MAX3464 Data Sheet
