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Detecting FET Stuck-Open Faults in CMOS Latches And Flip-Flops

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2 Author(s)
Reddy, M.K. ; University of Iowa ; Reddy, S.M.

The authors present evidence that conventional tests cannot detect FET stuck-open faults in several CMOS latches and flip-flops. Examples are given to show that stuck-open faults can change static latches and flip-flops into dynamic devices¿a danger to circuits whose operation requires static memory, since undetected FET stuck-open faults can cause malfunctions. Designs are given for several memory devices in which all single FET stuck-open faults are detectable. These memory devices include common latches, master-slave flip-flops, and scan-path flip-flops that can be used in applications requiring static memory elements whose operation can be reliably ascertained through conventional fault testing methods.

Published in:

Design & Test of Computers, IEEE  (Volume:3 ,  Issue: 5 )