Description 概述:
MAX481、MAX483、MAX485、MAX487、MAX488, MAX489, MAX490, MAX491以及MAX1487是用于RS-485与RS-422通信的低功耗收发器，每个器件中都具有一个驱动器和一个接收器。MAX483、MAX487、MAX488以及MAX489具有限摆率驱动器，可以减小EMI，并降低由不恰当的终端匹配电缆引起的反射，实现最高250kbps的无差错数据传输。MAX481、MAX485、MAX490、MAX491、MAX1487的驱动器摆率不受限制，可以实现最高2.5Mbps的传输速率。
这些收发器在驱动器禁用的空载或满载状态下，吸取的电源电流在120µA至500µA之间。另外，MAX481、MAX483与MAX487具有低电流关断模式，仅消耗0.1µA。所有器件都工作在5V单电源下。
驱动器具有短路电流限制，并可以通过热关断电路将驱动器输出置为高阻状态，防止过度的功率损耗。接收器输入具有失效保护特性，当输入开路时，可以确保逻辑高电平输出。
MAX487与MAX1487具有1/4单位负载的接收器输入阻抗，使得总线上最多可以有128个MAX487/MAX1487收发器。使用MAX488, MAX489, MAX490, MAX491可以实现全双工通信，而MAX481、MAX483、MAX485、MAX487与MAX1487则为半双工应用设计。
The MAX481, MAX483, MAX485, MAX487、MAX488, MAX489, MAX490, MAX491, and MAX1487 are low-power transceivers for RS-485 and RS- 422 communication. Each part contains 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, MAX491, and MAX1487 are not limited, allowing them to transmit up to 2.5Mbps.
These transceivers draw between 120µA and 500µA 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 0.1µA. 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-impedance state. The receiver input has a fail-safe feature that guarantees a logic-high 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 communications are obtained using the MAX488-MAX491, while the MAX481, MAX483, MAX485, MAX487, and MAX1487 are designed for half-duplex applications.
Key Features 关键特性
容错应用MAX3430: ±80V故障保护、失效保护、1/4单位负载、+3.3V、RS-485收发器 MAX3440E-MAX3444E: ±15kV ESD保护、±60V故障保护、10Mbps、失效保护、RS-485/J1708收发器
对于空间受限应用MAX3460-MAX3464: +5V、失效保护、20Mbps、Profibus RS-485/RS-422收发器 MAX3362: +3.3V、高速、RS-485/RS-422收发器，采用SOT23封装 MAX3280E-MAX3284E: ±15kV ESD保护、52Mbps、+3V至+5.5V、SOT23、RS-485/RS-422、真失效保护接收器 MAX3293/MAX3294/MAX3295: 20Mbps、+3.3V、SOT23、RS-485/RS-422发送器
对于多通道收发器应用MAX3030E-MAX3033E: ±15kV ESD保护、+3.3V、四路RS-422发送器
对于失效保护应用MAX3080-MAX3089: 失效保护、高速(10Mbps)、限摆率RS-485/RS-422收发器
对于低电压应用MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E: +3.3V供电、±15kV ESD保护、12Mbps、限摆率、真正的RS-485/RS-422收发器
For Fault-Tolerant Applications MAX3430: ±80V Fault-Protected, Fail-Safe, 1/4 Unit Load, +3.3V, RS-485 Transceiver MAX3440E-MAX3444E: ±15kV ESD-Protected, ±60V Fault-Protected, 10Mbps, Fail-Safe, RS-485/J1708 Transceivers
For Space-Constrained Applications MAX3460-MAX3464: +5V, Fail-Safe, 20Mbps, Profibus RS-485/RS-422 Transceivers MAX3362: +3.3V, High-Speed, RS-485/RS-422 Transceiver in a SOT23 Package MAX3280E-MAX3284E: ±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 MAX3030E-MAX3033E: ±15kV ESD-Protected, +3.3V, Quad RS-422 Transmitters
For Fail-Safe Applications MAX3080-MAX3089: 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-Limited, True RS-485/RS-422 Transceivers
应用:
工业控制局域网; 电平转换器;低功耗RS-422收发器;低功耗RS-485收发器;用于EMI敏感应用的收发器
低功耗、限摆率、RS-485/RS-422收发器。订购型号：MAX485MJA MAX485C MAX485D MAX485CPA+ MAX485CPA MAX485EPA+ MAX485EPA MAX485CSA+T MAX485CSA+ MAX485CSA MAX485CSA-T MAX485ESA+T MAX485ESA+ MAX485ESA MAX485ESA-T MAX485CUA MAX485CUA-T MAX485CUA+ MAX485CUA+T MAX1487C MAX1487D MAX1487CPA+ MAX1487CPA MAX1487EPA+ MAX1487EPA MAX1487CSA MAX1487CSA-T MAX1487CSA+ MAX1487CSA+T MAX1487ESA+T MAX1487ESA+ MAX1487ESA-T MAX1487ESA MAX1487CUA-T MAX1487CUA MAX1487CUA+ MAX1487CUA+T MAX481MJA MAX481C MAX481CD MAX481CPA MAX481CPA+ MAX481EPA+ MAX481EPA MAX481CSA+T MAX481CSA MAX481CSA-T MAX481CSA+ MAX481ESA+T MAX481ESA+ MAX481ESA-T MAX481ESA MAX481CUA MAX481CUA-T MAX483MJA MAX483C MAX483CD MAX483CPA+ MAX483CPA MAX483EPA+ MAX483EPA MAX483CSA MAX483CSA+T MAX483CSA+ MAX483CSA-T MAX483ESA-T MAX483ESA MAX483ESA+ MAX483ESA+T MAX483CUA-T MAX483CUA MAX483CUA+ MAX483CUA+T MAX488MJA MAX488C MAX488D MAX488CPA+ MAX488CPA MAX488EPA+ MAX488EPA MAX488CSA MAX488CSA+T MAX488CSA+ MAX488CSA-T MAX488ESA-T MAX488ESA MAX488ESA+ MAX488ESA+T MAX488CUA-T MAX488CUA MAX488CUA+ MAX488CUA+T MAX489MJD MAX489C/D MAX489CPD+ MAX489CPD MAX489EPD+ MAX489EPD MAX489CSD+T MAX489CSD+ MAX489CSD MAX489CSD-T MAX489ESD+T MAX489ESD-T MAX489ESD MAX489ESD+ MAX490MJA MAX490C/D MAX490CPA+ MAX490CPA MAX490EPA+ MAX490EPA MAX490CSA+T MAX490CSA+ MAX490CSA MAX490CSA-T MAX490ESA+T MAX490ESA+ MAX490ESA-T MAX490ESA MAX490CUA+ MAX490CUA MAX490CUA-T MAX490CUA+T MAX491MJD MAX491C MAX491D MAX491CPD+ MAX491CPD MAX491EPD+ MAX491EPD MAX491CSD+T MAX491CSD+ MAX491CSD-T MAX491CSD MAX491ESD-T MAX491ESD MAX491ESD+ MAX491ESD+T
