What is the function of pull up capacitor?

[shreekalak]

can there be anything such as capacitor pull up like wise of resistor pull up????
and if yes then what is its function???///
please reply.. thnx...

 

[hakeen]

capacitor along pull up

Hello

In some pull up configurations (open collector/drain), if you connect more than one of these configurations to the same supply, you connect capacitor between collector/drain (signal line) and GND (aka Wired AND/OR). This is mainly for signal integrity and higher noise immunity. lets say it is easy and cheap way of protection scheme.

Although capacitor is not placed between signal line and Vcc as Pull-up resistor, it is called pull up capacitor. Because it is for supporting Pull-up structure.

I hope this was what you looked for as definition.