Custom cell development for standard cell designs

The ASIC (application-specific integrated circuit) designer often searches through various ASIC databooks trying to locate a cell that the design requires. If it is not possible to find the cell needed, the designer either changes the design so it can be implemented using cells that are available or requests the development of a custom cell from the ASIC supplier. A discussion is presented of custom cell development considerations for standard cell designs. The benefits and risks of custom cell development are examined, and recommendations for minimizing the risks are made.>