I want to implement a pulse extender with a retriggerable multivibrator IC called CD74HC123EE4. Here is the datasheet.
The input will be a 32Hz pulse train with a 5 µsec duty cycle; and at the output the duty cycle will be stretched up to 1.5ms. It is okay to keep the duty cycle between %30 to %60.
Based on some examples I came up with the following circuit:
Even though it is extremely slow to simulate this, it seems fine in simulation.
There is also this document and it has a section called "Operating Rules". And somewhere else I read that the input better not exceed 4V(Thats why I use R4 and R2 at the input to lower 5V to around 4V input). I tried to follow "Operating Rules", but before I implement this I wanted to be whether there is some fundamental error or mistake. Is this circuit fine enough for the purpose?