The output is the inverted carry of carry input
c and the inverse of inputs
a and b.
The stage efforts are 1.6, 1.9 and 2.4 for the x05, x1 and x2
drive strengths respectively. The cells here use a P/N ratio of about 2.
z:((a'*b')+(a'*c)+(b'*c))'
cell width
power
Generic 0.13um typical timing (ps & ps/fF),
pin c.