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1、For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxims website at www.maxim-. General Description The MAX481, MAX483, MAX485, MAX487MAX491, and MAX1487 are low-power transceivers for RS-485 and RS- 422 communication. Each part contains
2、 one driver and one receiver. The MAX483, MAX487, MAX488, and MAX489 feature reduced slew-rate drivers that minimize EMI and reduce reflections caused by improperly terminated cables, thus allowing error-free data transmission up to 250kbps. The driver slew rates of the MAX481, MAX485, MAX490, MAX49
3、1, and MAX1487 are not limited, allowing them to transmit up to 2.5Mbps. These transceivers draw between 120A and 500A of supply current when unloaded or fully loaded with disabled drivers. Additionally, the MAX481, MAX483, and MAX487 have a low-current shutdown mode in which they consume only 0.1A.
4、 All parts operate from a single 5V supply. Drivers are short-circuit current limited and are protected against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into a high-imped- ance state. The receiver input has a fail-safe feature that guarantees a logic-h
5、igh output if the input is open circuit. The MAX487 and MAX1487 feature quarter-unit-load receiver input impedance, allowing up to 128 MAX487/ MAX1487 transceivers on the bus. Full-duplex communi- cations are obtained using the MAX488MAX491, while the MAX481, MAX483, MAX485, MAX487, and MAX1487 are
6、designed for half-duplex applications. _Applications Low-Power RS-485 Transceivers Low-Power RS-422 Transceivers Level Translators Transceivers for EMI-Sensitive Applications Industrial-Control Local Area Networks _Next Generation Device Features For Fault-Tolerant Applications MAX3430: 80V Fault-Pr
7、otected, Fail-Safe, 1/4 Unit Load, +3.3V, RS-485 Transceiver MAX3440EMAX3444E: 15kV ESD-Protected, 60V Fault-Protected, 10Mbps, Fail-Safe, RS-485/J1708 Transceivers For Space-Constrained Applications MAX3460MAX3464: +5V, Fail-Safe, 20Mbps, Profibus RS-485/RS-422 Transceivers MAX3362: +3.3V, High-Spe
8、ed, RS-485/RS-422 Transceiver in a SOT23 Package MAX3280EMAX3284E: 15kV ESD-Protected, 52Mbps, +3V to +5.5V, SOT23, RS-485/RS-422, True Fail-Safe Receivers MAX3293/MAX3294/MAX3295: 20Mbps, +3.3V, SOT23, RS-855/RS-422 Transmitters For Multiple Transceiver Applications MAX3030EMAX3033E: 15kV ESD-Prote
9、cted, +3.3V, Quad RS-422 Transmitters For Fail-Safe Applications MAX3080MAX3089: Fail-Safe, High-Speed (10Mbps), Slew-Rate-Limited RS-485/RS-422 Transceivers For Low-Voltage Applications MAX3483E/MAX3485E/MAX3486E/MAX3488E/ MAX3490E/MAX3491E: +3.3V Powered, 15kV ESD-Protected, 12Mbps, Slew-Rate-Limi
10、ted, True RS-485/RS-422 Transceivers MAX481/MAX483/MAX485/MAX487MAX491/MAX1487 Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers _ Maxim Integrated Products1 _Selection Table 19-0122; Rev 8; 10/03 MAX481 MAX483 MAX485 MAX487 MAX488 MAX489 MAX490 MAX491 MAX1487 PART NUMBER HALF/FULL DUPLEX DATA
11、 RATE (Mbps) SLEW-RATE LIMITED LOW-POWER SHUTDOWN RECEIVER/ DRIVER ENABLE QUIESCENT CURRENT (A) NUMBER OF TRANSMITTERS ON BUS PIN COUNT Half Half Half Half Full Full Full Full Half 2.5 0.25 2.5 0.25 0.25 0.25 2.5 2.5 2.5 No Yes No Yes Yes Yes No No No Yes Yes No Yes No No No No No Yes Yes Yes Yes No
12、 Yes No Yes Yes 300 120 300 120 120 120 300 300 230 32 32 32 128 32 32 32 32 128 8 8 8 8 8 14 8 14 8 Ordering Information appears at end of data sheet. 元器件交易网w w w . c e c b 2 b . c o m MAX481/MAX483/MAX485/MAX487MAX491/MAX1487 Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers 2_ ABSOLUTE MAXI
13、MUM RATINGS Supply Voltage (VCC).12V Control Input Voltage (RE, DE).-0.5V to (VCC+ 0.5V) Driver Input Voltage (DI).-0.5V to (VCC+ 0.5V) Driver Output Voltage (A, B).-8V to +12.5V Receiver Input Voltage (A, B).-8V to +12.5V Receiver Output Voltage (RO).-0.5V to (VCC+0.5V) Continuous Power Dissipation
14、 (TA= +70C) 8-Pin Plastic DIP (derate 9.09mW/C above +70C) 727mW 14-Pin Plastic DIP (derate 10.00mW/C above +70C) 800mW 8-Pin SO (derate 5.88mW/C above +70C).471mW 14-Pin SO (derate 8.33mW/C above +70C).667mW 8-Pin MAX (derate 4.1mW/C above +70C)830mW 8-Pin CERDIP (derate 8.00mW/C above +70C).640mW
15、14-Pin CERDIP (derate 9.09mW/C above +70C).727mW Operating Temperature Ranges MAX4_ _C_ _/MAX1487C_ A .0C to +70C MAX4_ _E_ _/MAX1487E_ A.-40C to +85C MAX4_ _MJ_/MAX1487MJA .-55C to +125C Storage Temperature Range.-65C to +160C Lead Temperature (soldering, 10sec).+300C DC ELECTRICAL CHARACTERISTICS (VCC= 5V 5%, TA= TMINto TMAX, unless otherwise noted.) (Notes 1, 2) Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, a
