MAX3082ESA中文资料

19-1138; Rev 3; 12/05

Fail-Safe, High-Speed (10Mbps),

Slew-Rate-Limited RS-485/RS-422 Transceivers

The MAX3080–MAX3089 high-speed transceivers forRS-485/RS-422 communication contain one driver and For Fault-Tolerant Applications:

one receiver. These devices feature fail-safe circuitry,MAX3430: ±80V Fault-Protected, Fail-Safe, 1/4-which guarantees a logic-high receiver output when theUnit Load, +3.3V RS-485 Transceiverreceiver inputs are open or shorted. This means that For Low-Voltage Applications:

the receiver output will be a logic high if all transmitterson a terminated bus are disabled (high impedance).MAX3362: +3.3V, High-Speed, RS-485/RS-422The MAX3080/MAX3081/MAX3082 feature reducedTransceiver in a SOT23 Packageslew-rate drivers that minimize EMI and reduce reflec- For Multiple Transceiver Applications:

tions caused by improperly terminated cables, allowingMAX3030E–MAX3033E: ±15kV ESD-Protected,error-free data transmission up to 115kbps. TheMAX3083/MAX3084/MAX3085 offer higher driver out-+3.3V, Quad, RS-422 Transmitters

put slew-rate limits, allowing transmit speeds up toMAX3040–MAX3045: ±10kV ESD-Protected, Quad,500kbps. The MAX3086/MAX3087/MAX3088’s driver+5V, RS-485/RS-422 Transmitters

slew rates are not limited, making transmit speeds upto 10Mbps possible. The MAX3089’s slew rate is Applications

selectable between 115kbps, 500kbps, and 10MbpsRS-422/RS-485 Communicationsby driving a selector pin with a single three-state driver.Level Translators

These transceivers typically draw 375µA of supply Transceivers for EMI-Sensitive Applicationscurrent when unloaded, or when fully loaded with thedrivers disabled.

Industrial-Control Local Area Networks

All devices have a 1/8-unit-load receiver input imped-ance that allows up to 256 transceivers on the bus. TheMAX3082/MAX3085/MAX3088 are intended for half-duplex communications, while the MAX3080/MAX3081/MAX3083/MAX3084/MAX3086/MAX3087 are intendedfor full-duplex communications. The MAX3089 is selec-table between half-duplex and full-duplex operation. Italso features independently programmable receiverand transmitter output phase via separate pins.

Ordering Information continued at end of data sheet.

________________________________________________________________Maxim Integrated Products

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For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at http://.

MAX3080–MAX3089

Fail-Safe, High-Speed (10Mbps),

Slew-Rate-Limited RS-485/RS-422 Transceivers

MAX3080–MAX3089

ABSOLUTE MAXIMUM RATINGS

Supply Voltage (VCC) ............................................................+7VControl Input Voltage (RE, DE)...................-0.3V to (VCC+ 0.3V)Special Input Voltage

(H/F, SRL, TXP, RXP)..................................-0.3V to (VCC+ 0.3V)Driver Input Voltage (DI).............................-0.3V to (VCC+ 0.3V)Driver Output Voltage (A, B, Y, Z)........................................±13VReceiver Input Voltage (A, B)..............................................±13VReceiver Input Voltage, Full Duplex (A, B)..........................±25VReceiver Output Voltage (RO)....................-0.3V to (VCC+ 0.3V)

Continuous Power Dissipation

8-Pin Plastic DIP (derate 9.09mW/°C above +70°C)...727mW8-Pin SO (derate 5.88mW/°C above +70°C)................471mW14-Pin Plastic DIP (derate 10.0mW/°C above +70°C)....800mW14-Pin SO (derate 8.33mW/°C above +70°C)..............667mWOperating Temperature Ranges

MAX308_C_ _.....................................................0°C to +70°C MAX308_E_ _...................................................-40°C to +85°CStorage Temperature Range.............................-65°C to +150°CLead 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 functionaloperation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure toabsolute maximum rating conditions for extended periods may affect device reliability.

DC ELECTRICAL CHARACTERISTICS

(VCC= +5V ±5%, TA= TMINto TMAX, unless otherwise noted. Typical values are at VCC= +5V and TA= +25°C.) (Note 1)

Fail-Safe, High-Speed (10Mbps),

Slew-Rate-Limited RS-485/RS-422 Transceivers

DC ELECTRICAL CHARACTERISTICS (continued)

(VCC= +5V ±5%, TA= TMINto TMAX, unless otherwise noted. Typical values are at VCC= +5V and TA= +25°C.) (Note 1)

Note 1:All currents into the device are positive; all currents out of the device are negative. All voltages are referred to device

ground unless otherwise noted.

Note 2: VODand VOCare the changes in VODand VOC, respectively, when the DI input changes state.

Note 3:The SRL pin is internally biased to VCC / 2 by a 100k /100k resistor divider. It is guaranteed to be VCC / 2 if left

unconnected.

Note 4:Maximum current level applies to peak current just prior to foldback-current limiting; minimum current level applies during

current limiting.

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MAX3080–MAX3089

Fail-Safe, High-Speed (10Mbps),

Slew-Rate-Limited RS-485/RS-422 TransceiversMAX3080–MAX3089

SWITCHING CHARACTERISTICS—MAX3080–MAX3082, and MAX3089 with SRL = Unconnected

(VCC= +5V ±5%, TA= TMINto TMAX, unless otherwise noted. Typical values are at VCC= +5V and TA= +25°C.)

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