输入开路式前置放大器 input open type preamplifier
开路输入阻抗 open-circuit input impedance ; open-circuit driving-point impedance
共发射极开路输入电容 Cieo
输入短路开关 [电] short-circuit switch of input
电极开路输入 Open collector input
普通开关输入电路 ordinary switch input circuit
接收器输入具有失效保护特性，当输入开路时，可确保逻辑高电平输出。
The receiver input has a fail-safe feature that guarantees a logic-high output if the input is open circuit.
然而，实际的安培计在输入端开路时的确有一些小的电流。
Practical ammeters, however, do have some small current that flows when the input is open.
注：(1)待机(引脚3)有一个内部上拉，如果是左开路模块将输入功率运行时应用。
Notes: (1) the Standby (pin 3) has an internal pull-up, and if it is left open circuit the module will operate when input power is applied.
应用推荐