A basic doubt in LM311 comparator

[Narmu]

Hey guys, I m using a voltage comparator, LM311 in my circuit. A pull up resistor is required for the o/p of the collector to go high ryt?? so on wat basis the resistor value is decided? Is there any particular design for it? If so, can you please help me?

 

[crutschow]

It depends upon the load you want to drive and how fast you want a response.

You should keep the output sink current to no more than 8mA so the smallest resistor you can use is R = Vs / 8mA where Vs is the voltage to the resistor.

The largest value depends upon the load and the response time you need to drive the output load stray capacitance.