The present invention provides an improved method for optimizing a quantity of bins used to transfer raw material from a producer to a consumer and to keep inventory at a minimum while optimizing output in a supply and demand manufacturing operation. The integrated circuit comprises an internal current source and an external interface pin. A retainer including a partition wall is inserted between two adjacent terminal accommodating holes, and is mounted onto the outer periphery of the terminal accommodating portion from behind. Via a tunneling effect between bands, electrons gather in the floating body, which is defined as a first storage state; via forward bias of PN junction, electrons are emitted out from the floating body or holes are injected into the floating body, which is defined as a second storage state.