The circuits of VLSI chips are designed to be tri-statable as shown in Figure 33.41, which is designed to be driven only when the output enable signal is asserted. The circuit implementation requires 12 transistors. However in terms of silicon area, this implementation may require a relatively small area since the last stage transistors need not be sized large.
is asserted. The circuit implementation requires 12 transistors. However in terms of silicon area, this implementation may require a relatively small area since the last stage transistors need not be sized large. 
