LT1785IS8

peculiarity

• 提供了至 ±60V 的过压线路故障保护
• 引脚与 LTC485 和 LTC491 兼容
• 高输入阻抗支持多达 128 个节点
• 不会因 ESD 而发生损坏或闭锁现象
  IEC-1000-4-2 Level 4：±15kV 空气放电
  IEC-1000-4-2 Level 2：±4kV 接触放电
• 用于 EMI 辐射控制的受控转换速率
• 对于浮置、短路或待用输入，接收器输出保证为高电平状态
• 当被关断或断电时，输出呈高阻抗状态
• 驱动低成本、低阻抗电缆
• 在所有的输出端上均提供了短路保护
• 具热停机保护功能
• 可在高达 125℃ 的温度条件下保证操作性能

description

®The LT 1785/LT1791 are half-duplex and full-duplex differential bus transceivers for RS485 and RS422 applications that feature on-chip protection circuitry against overvoltage faults on data transmission lines. The receiver input and driver output pins are able to withstand voltage faults up to ±60V (relative to ground potential) without damaging the device. Failures can occur when the transceiver is running, down, or de-energized. Support 250kbaud data rates on networks of up to 128 nodes. The controlled slew rate on the driver output is used to control EMI emissions and improve data transmission integrity on improper termination lines. The specifications of the drive require that it be able to function properly with inexpensive cables with characteristic impedances as low as 72Ω. LT1785A/LT1791A devices have a "failsafe" receiver input designed to guarantee that the receiver output is high for short, open, or standby data lines. The built-in ESD protection circuitry eliminates the need for additional external protection devices. The LT1785/LT1785A is available in 8-pin DIP and SO packages, while the LT1791/LT1791A is available in 14-pin DIP and SO packages.