Table 4.1: Transition propagation rate for different gates. The rising and the falling
transitions do not enforce the same delay rates.
Gate |
Rising (pS∕μm) |
Falling (pS∕μm) |
Inverter |
86.9 |
40.77 |
NAND2 |
176.9 |
507.7 |
N0R2 |
95.4 |
1106.2 |
the gates deviate from their nominal values, i.e. [49],
dr(gi) = daomm⅛) + ξrtgilgi, (4.4)
where (grɪ ) is the nominal delay for rising transition and lgi is the varia-
tion for the gate gi and ξrι3i is a constant coefficient. Table 4.1 shows the constant
coefficients for NAND2 gate. Similarly for the falling transition,
dʃ(^) = dy0mmal(<7j) + ξf,gilgi. (4.5)
Thus, Equation 4.3 becomes
43