There are different vt class cells to optimize the power. HVT, RVT & LVT. There are XHVT cells also in few libraries. Basically, they are classified into different groups depending on their threshold voltage.
HVT:
high V threshold. Can be used in the path where timing is not critical. So by using HVT cells we can save power.
LVT:
- Low V threshold. One should use these cells in timing critical paths. These cells are fast but , comsumes more power due to its leakage. So it will consume more power. So use only when timing is critical.
SVT:
Standard V threshold. Best of both world. Medium delay and medium power requirment. So if timing is not met by small magin with HVT, you should try with SVT. And at last LVT.
Good One
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