Hi Chandu,
As you are probably aware, the inputs P0 & NO can't be both 1 at the same time. With a 10Hz square wave, do you know the rise & fall time of waveform? I am afraid that the if rise and fall time of the 10Hz square wave is too slow, both inputs might be interpreted as 1's during transitions.
Also, please keep in mind that we don't recommend you continuously applied a square wave to the input (CW mode) when the supplies are more than +/-10V (dependin on input frequency and load). If you want to continuously applied a square wave, we recommend you lower the supplies to +/-10V and use input frequency of 1MHz or less.
Regards,
Charles