i m using dallas 1232 and it generates false reset
when there is noise spikes in power supply

BS, they are not "false" they are producing a reset when the uC might fail due to "noise spikes in power supply".

I know of no properly decoupled 1232 or other supervisor that generates "false reset". The fact that you "correct" a problem by removing the supervisor just ensures that you will have a problem that happens a little less frequent and has unpredictable results namely the uC reacting to the spikes and doing whatever istead of being reset.

Erik