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Loading effects on metastable parameters of CMOS latches

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2 Author(s)
C. L. Portmann ; Center for Integrated Syst., Stanford Univ., CA, USA ; T. H. Y. Meng

We have discussed the behavior of buffered and unbuffered latches versus loading from a metastable performance viewpoint. A formula to determine T/sub 0/ for a buffered latch from an unbuffered one has been described. Measured results were presented for buffered and unbuffered latches. The results shown here are relevant to standard cell or gate array ASIC designers who generally use cells contained within a library and have little control over the cells, but some control over the selection and loading. Our results show the buffered version is superior for all fanouts greater than one; however, the MTBF performance is still exponentially related to loading.

Published in:

VLSI Circuits, 1993. Digest of Technical Papers. 1993 Symposium on

Date of Conference:

19-21 May 1993