Slide 22 of 173
Notes:
The stuck-open fault is popular for use in CMOS circuits. When a defect occurs that breaks a line internal to a CMOS gate, it can result in a “memory effect.” For example, in this circuit, if the output is driven high with a 00 input, and then a 10 input is applied, then the output will stay high (its previous value). However, if the output is driven low with a 01 input, and then the 10 input is applied, then the output will stay low (its previous value) which appears OK.
