MAX1487, MAX481, MAX483, MAX485, MAX487, MAX488, MAX489, MAX490, MAX491
低功耗、限摆率、RS-485/RS-422收发器

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

技术支持：
MAX485 DataSheet.PDF
提高RS-485网络可靠性的若干措施.PDF
RS-232至RS-485/ RS-422智能转换器.PDF

订购信息：
MAX485   MAX1487   MAX481   MAX483   MAX488   MAX489   MAX490   MAX491