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Subject: Re: Vcc pin disconnection in CMOS ICs.

Date: 08/17/00 at 11:30 PM
Posted by: SC Mishra
E-mail: dsig5@rdso.railnet.gov.in
Message Posted:

In Reply to: Re: Vcc pin disconnection in CMOS ICs. posted by Chaman on 08/17/00 at 9:31 AM:

Dear Sir,

I feel that I could not communicate the problem correctly. It is like this: For designing any safety critical system it is necessary that any failure of component or software should not bring system in unsafe state for example if any coponent failure takesplace in the nuclear reactor control system which causes control rods to be pulled out , it may turn a nuclear reactor to a atom bomb ie uncontrolled nuclear reaction. To avoid such happening any fault in any component of such system should cause system shutdown in a safe way so that system is re started after rectification of the fault and any untoward happening is avoided.

Therefore basic rule is that any fault which is hazardous must be detected and negated. In the case of disconnection of Vcc it is becoming deficult to detect the fault in working system.

SC Mishra

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