The P/N ratio is kept approx equal to 2. Series N-transistors are more conductive than series P-transistors, which explains the apparently larger P-transistors. The width of the P-transistors connected to pins b & c are designed to have a similar conductivity to the two series P-transistors, so that the output drive capability is consistent.

z:((a1+a2)*b*c)'

cell width

power

Generic 0.13um typical timing (ps & ps/fF), pin a2.

leakage

dynamic

tR=PropR+RampR×Load(fF), tF=PropF+RampF×Load(fF)

lambda

0.13um

nW

nW/MHz

PinCap

PropR

RampR

PropF

RampF

oai211v0x05

48

2.64

0.51

6.4

3.4f

86

7.35

57

5.15

oai211v0x1

52

2.86

0.86

10.4

5.7f

83

4.34

54

3.02

oai211v0x05

oai211v0x1