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Politics : Formerly About Advanced Micro Devices -- Ignore unavailable to you. Want to Upgrade?

To: Bill Jackson who wrote (27028)	12/20/1997 8:53:00 PM
From: Yousef	Read Replies (1) \| Respond to of 1580006

Bill, Re: "There might be 10 machines at stage 2(say,slow) but only 2 at stage 1 as each one is 5 times as fast as a stage 2 step.They would then adjust the number of machines at each stage to keep a similar finished goods flow rate." That is exactly correct ... One must determine machine thruput and then purchase enough to eliminate "bottlenecks". At any one step, there are a number (probably minimum of 3) machines that can do the same job, so if one goes down, the entire line is not down. But as I stated before, much of this equipment can be used at .25um. Re: "How deep is the field on the DUV, and the length over which they focus ..." The maximum field size on a stepper will produce a chip that is 22mm X 22mm ... also the depth of focus is about 1 - 2 microns. Hope this helps. Make It So, Yousef