Patent ID: 6121792
Filing Date: 2000-09-19
Classification: H03K

Abstract:
An input circuit for transferring an external logical signal into inner circuits, said input circuit comprising:a current control means connected to a power supply terminal for controlling a first current to be supplied to a first node according to a second current to be supplied to a second node;an input level transfer means connected between the first node and a ground terminal for transferring logic of the external logical signal to the first node as an intermediate signal whereof potential of a HIGH level is restricted within potential of the power supply terminal;a level shift means connected between the second node and a third node for transferring logic of the intermediate signal to the third node by shifting a LOW level of the intermediate signal to substantially the same level with a LOW level of the external logical signal;a reference current generating means connected between the third node and the ground terminal for determining a current value of the second current; anda transition current generating means for controlling the level shift means to supply a sufficient transition current to the third node.