Patent ID: 6525576
Filing Date: 2003-02-25
Classification: H03K

Abstract:
An input/output circuit comprising:a first type field effect transistor having a channel of a first conductivity, having a gate connected to a first node, having a first electrode connected to a first power supply and a second electrode connected to a second node, a second type field effect transistor having a channel of the first conductivity, having a gate connected to a third node, having a first electrode connected to a second node, having a second electrode connected to a fourth node and having a substrate connected to a fifth node which is floating, a third type field effect transistor having a channel of the first conductivity, having a gate connected to said first power supply, having a first electrode connected to said third node, having a second electrode connected to said fourth node and having a substrate connected to said fifth node, a fourth type field effect transistor having a channel of a second conductivity opposite the first conductivity, having a gate connected to said first power supply, having a first electrode connected to said fourth node and having a second electrode connected to a sixth node, a fifth type field effect transistor having a channel of the first conductivity, having a gate connected to said third node, having a first electrode connected to said sixth node, having a second electrode connected to said fourth node and having a substrate connected to said fifth node, an inverter means having an input terminal connected to said sixth node and having an output terminal connected to a seventh node, a sixth type field effect transistor having a channel of the second conductivity, having a gate connected to said seventh node, having a first electrode connected to a second power supply and a second electrode connected to an eighth node, a seventh type field effect transistor having a channel of the second conductivity, having a gate connected to a ninth node, having a first electrode connected to said eighth node and having a second electrode connected to a tenth node, an eighth type field effect transistor having a channel of the second conductivity, having a gate connected to an eleventh node, having a first electrode connected to said tenth node and having a second electrode connected to said first node, and a ninth type field effect transistor having a channel of the second conductivity, having a gate connected to said first power supply, having a first electrode connected to said tenth node and having a second electrode connected to said third node.