Abstract: State definition and retention circuits are described. In one embodiment, a circuit includes two cross-connected PMOS transistors, first, second, and third NMOS transistors coupled to the PMOS transistors, an inverter circuit, and an output transistor connected to the PMOS transistors and to an output terminal of the circuit. The second NMOS transistor is connected to an input terminal of the circuit. A drain terminal and a gate terminal of the third NMOS transistor are connected to gate terminals of the PMOS transistors. The inverter circuit is coupled to the first and second NMOS transistors and to the input terminal. The inverter circuit is connected between a first power supply and a first base voltage. The PMOS transistors, the NMOS transistors, and the output transistor are connected between a second power supply and a second base voltage. Other embodiments are also described.

Abstract: State definition and retention circuits are described. In one embodiment, a circuit includes two cross-connected PMOS transistors, first, second, and third NMOS transistors coupled to the PMOS transistors, an inverter circuit, and an output transistor connected to the PMOS transistors and to an output terminal of the circuit. The second NMOS transistor is connected to an input terminal of the circuit. A drain terminal and a gate terminal of the third NMOS transistor are connected to gate terminals of the PMOS transistors. The inverter circuit is coupled to the first and second NMOS transistors and to the input terminal. The inverter circuit is connected between a first power supply and a first base voltage. The PMOS transistors, the NMOS transistors, and the output transistor are connected between a second power supply and a second base voltage. Other embodiments are also described.

Abstract: A high voltage tolerant bus holder circuit and method of operating the bus holder circuit utilizes first and second control transistors connected in parallel between a control terminal of a pull-up transistor and a bus. The first control transistor is used to turn on the pull-up transistor during a pull-up mode of operation. The second control transistor is used to turn off the pull-down transistor when a voltage on the bus exceeds a threshold.