| 首頁＞Maxim 美信/Dallas 達拉斯＞接口與互連產品＞MAX1487, MAX481, MAX483, MAX485, MAX487, MAX488, MAX489, MAX490, MAX491
MAX1487, MAX481, MAX483, MAX485, MAX487, MAX488, MAX489, MAX490, MAX491
低功耗、限擺率、RS-485/RS-422收發器 Description 概述:
MAX481、MAX483、MAX485、MAX487、MAX488, MAX489, MAX490, MAX491以及MAX1487是用于RS-485與RS-422通信的低功耗收發器，每個器件中都具有一個驅動器和一個接收器。MAX483、MAX487、MAX488以及MAX489具有限擺率驅動器，可以減小EMI，并降低由不恰當的終端匹配電纜引起的反射，實現最高250kbps的無差錯數據傳輸。MAX481、MAX485、MAX490、MAX491、MAX1487的驅動器擺率不受限制，可以實現最高2.5Mbps的傳輸速率。
這些收發器在驅動器禁用的空載或滿載狀態下，吸取的電源電流在120µA至500µA之間。另外，MAX481、MAX483與MAX487具有低電流關斷模式，僅消耗0.1µA。所有器件都工作在5V單電源下。
驅動器具有短路電流限制，并可以通過熱關斷電路將驅動器輸出置為高阻狀態，防止過度的功率損耗。接收器輸入具有失效保護特性，當輸入開路時，可以確保邏輯高電平輸出。
MAX487與MAX1487具有1/4單位負載的接收器輸入阻抗，使得總線上最多可以有128個MAX487/MAX1487收發器。使用MAX488, MAX489, MAX490, MAX491可以實現全雙工通信，而MAX481、MAX483、MAX485、MAX487與MAX1487則為半雙工應用設計。
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 關鍵特性
- 容錯應用MAX3430: ±80V故障保護、失效保護、1/4單位負載、+3.3V、RS-485收發器 MAX3440E-MAX3444E: ±15kV ESD保護、±60V故障保護、10Mbps、失效保護、RS-485/J1708收發器
- 對于空間受限應用MAX3460-MAX3464: +5V、失效保護、20Mbps、Profibus RS-485/RS-422收發器 MAX3362: +3.3V、高速、RS-485/RS-422收發器，采用SOT23封裝 MAX3280E-MAX3284E: ±15kV ESD保護、52Mbps、+3V至+5.5V、SOT23、RS-485/RS-422、真失效保護接收器 MAX3293/MAX3294/MAX3295: 20Mbps、+3.3V、SOT23、RS-485/RS-422發送器
- 對于多通道收發器應用MAX3030E-MAX3033E: ±15kV ESD保護、+3.3V、四路RS-422發送器
- 對于失效保護應用MAX3080-MAX3089: 失效保護、高速(10Mbps)、限擺率RS-485/RS-422收發器
- 對于低電壓應用MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E: +3.3V供電、±15kV ESD保護、12Mbps、限擺率、真正的RS-485/RS-422收發器
- 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
應用:
工業控制局域網; 電平轉換器;低功耗RS-422收發器;低功耗RS-485收發器;用于EMI敏感應用的收發器
技術支持：
MAX485 DataSheet.PDF
提高RS-485網絡可靠性的若干措施.PDF
RS-232至RS-485/ RS-422智能轉換器.PDF
訂購信息：
MAX485 MAX1487 MAX481 MAX483 MAX488 MAX489 MAX490 MAX491 MAX485訂購信息：
MAX1487訂購信息：
MAX481訂購信息：
MAX483訂購信息：
MAX488訂購信息：
MAX489訂購信息：
MAX490訂購信息：
MAX491訂購信息：
|
