Using ASICs for component integration

The authors examine the impact of VLSI ASICs (application-specific integrated circuits) on the use of component integration in electronic systems and show how advances in semiconductor technology affect the choice of the level of integration used in ASIC devices. The constraints and limitations on VLSI component integration are also discussed. It is shown that the optimal level of component integration can be determined for a set level of specific system goals such as cost, performance, and size. The effects of component integration are illustrated by using a simple electronic system containing memory digital ASICs, and a microprocessor on a single circuit board as an example. It is concluded that the desired level of component integration is determined through the examination of system requirements such as volume, performance, reliability, and cost goals. The level of integration is subject to technical and economic limitations on chip complexity. Limitations involving both technical and economic issues result from the constraints of process, design, assembly, and test of ASICs. In addition, consideration of the economic return on investment generally favors the use of ASICs for products produced in high volume, where the initial cost of ASIC development is small compared to the total value of the systems produced