POLAR PROGRAMMABLE CIRCUIT

摘要

The circuit is for changing polarity of external control signal of mask ROM oby ion injection method. The circuit comprises a first transistor having drain connected to source voltage, and a gate and a source connected to an output node, and a second transistor having a drain connected to an output node, and a gate and a source connected to ground. The level of output node is determined by the combination of type of the transistors, for source voltage level output, a first depletion transistor and a second enhancement transistor combination are used and for ground level output, a first enhancement transistor and a second depletion transistor combination are used.