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For multi-stage cells, the measurement threshold for the output transition time is the 10%-90% points. This is also the threshold for one series transistor in a single stage inverting cell.

For a single stage inverting cell with series connected transistors, the measurement threshold depends on the position of the transistor in the series stack.

P-transistor position lower_lh upper_lh
A1 10% 90%
B1  8% 92%
C1  7% 93%
D1  6% 94%
E1  5% 95%
N-transistor position lower_hl upper_hl
A2 10% 90%
B2  8% 92%
C2  7% 93%
D2  6% 94%
E2  5% 95%

measurement thresholds