ZHCSNX5F August 1984 – April 2021 SN54HC125 , SN74HC125
PRODUCTION DATA
请参考 PDF 数据表获取器件具体的封装图。
Standard CMOS inputs are high impedance and are typically modeled as a resistor from the input to ground in parallel with the input capacitance given in the Electrical Characteristics - 74. The worst case resistance is calculated with the maximum input voltage, given in the Absolute Maximum Ratings, and the maximum input leakage current, given in the Electrical Characteristics - 74, using ohm's law (R = V ÷ I).
Signals applied to the inputs need to have fast edge rates, as defined by the input transition time in the Recommended Operating Conditions to avoid excessive current consumption and oscillations. If a slow or noisy input signal is required, a device with a Schmitt-trigger input should be used to condition the input signal prior to the standard CMOS input.