High voltage tolerant bus holder circuit and method of operating the circuit

摘要

A high voltage tolerant bus holder circuit (100) and method of operating the bus holder circuit utilizes first and second control transistors (110,112) connected in parallel between a control terminal (VX) of a pull-up transistor (104) and a bus (118). The first control transistor (110) is used to turn on the pull-up transistor (104) during a pull-up mode of operation. The second control transistor (112) is used to turn off the pull-down transistor (106) when a voltage on the bus exceeds a threshold.