Patent ID: 6072676
Filing Date: 2000-06-06
Classification: H01L,H03F

Abstract:
A circuit comprising:an input/output (I/O) terminal;a first current source having a first side coupled to a first supply rail and a second side;a first transistor having a control lead, a first side coupled to the second side of the first current source, and a second side coupled to the I/O terminal;a second transistor having a control lead, a first side coupled to the I/O terminal, and a second side coupled to the control lead of the first transistor;the transistors being biased so that current flows between the first current source and the I/O terminal if the voltage at the I/O terminal has a first relationship to a threshold voltage level, and if the voltage at the I/O terminal has a second relationship to the threshold voltage level, the second transistor is turned on thereby causing the first transistor to be turned off.