An inproved version of the circuit CIR129E is shown here. The resistorR1 must be at least 5 times larger than R. The diode is any general-purpose silicon type, such as the 1N4148 or 1N914. This circuit is triggered by the positive transition of the input signal. The minimum value recommended for C is 47 pF. The outputs are complementary to each other. The input pin never be let floating.