Answer / pradipta sarkar

tristate is a inverter with 3 o/p state: 1,0,z(high
inpedence state).it is implementated by adding two more nmos
(or pmos)-1 btwn d original nmos& o/p,1 btwn d pmos &o/p to
a odinary inverter. depending on wheather the additional 2
nmos are kept on/off d o/p behaves like normal inverter/z
respectively.

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