在满足电路时序要求的前提下,为了抑制干扰源,在关建信号输出端串入小阻值的电阻,通常采用22-33ohm的电阻。输出端串小电阻能减慢上升/下降时间并能使过冲及下冲信号变得较平滑,减小输出波形的高频协波幅度,达到降EMI的目地 。并可使系统稳定
I have read a AN that is "Businterface Devices With output-Damping Resistors or Reduced-Drive Output "which come from TI who have the interesting on it can find it to read