Patent ID: 7212058
Filing Date: 2007-05-01
Classification: H02M

Abstract:
1. A circuit, comprising: a first current limiting circuit including a first switch and a first current source coupled between a selector terminal and a first voltage bus, wherein one mode of operation of an integrated circuit is selected when there is no external connection to the selector terminal and another mode of operation of the integrated circuit is selected when a voltage at the selector terminal is fixed by an external connection to a regulated voltage, the first current limiting circuit having a first fixed current limit value and a third fixed current limit value, the first current limiting circuit adapted to limit a current out of the selector terminal to the first fixed current limit value or the third fixed current limit value in response to a voltage on the selector terminal; and a second current limiting circuit including a second switch and a second current source coupled between the selector terminal and a second voltage bus, the second current limiting circuit having a second fixed current limit value and a fourth fixed current limit value, the second current limiting circuit adapted to limit a current into the selector terminal to the second fixed current limit value or the fourth fixed current limit value in response to the voltage on the selector terminal.