Formula for "Drive Strength" of a standard cell

[iamcharlz]

Is there a formula for "Drive Strength" of a standard cell? Or atleast may I know on what all physical attributes of a cell the drive strength depends on?

Thanks in advance!

 

[nitin kala]

Drive strength is decided by the amount of current this cell can throw at load to see logical voltage levels. For example, if buf1x gives x delay for c load then buf2x gives same x delay for 2c load. Basicaly it depends on the internal cells sizes used for the design.