Failsafe node voltage setting circuit

A method, comprising:

• controlling, by first and second control transistors, a first voltage setting transistor to operate in a conductive state in response to both a supply voltage of a supply voltage node and a pad node voltage of a pad node corresponding to logical one,
• wherein the second control transistor includes:
• a first conduction terminal coupled to the pad node;
• a second conduction terminal coupled to a control node;
• and
• a control terminal coupled to the supply voltage node;
• controlling, by the first and second control transistors, the first voltage setting transistor to operate in a nonconductive state in response to one of the supply voltage or the pad node voltage corresponding to the logical one and another one of the supply voltage or the pad node voltage corresponding to logical zero;
• and
• in response to controlling the first voltage setting transistor to operate in the conductive state, setting, by the first voltage setting transistor, a voltage of a failsafe node to the supply voltage of the supply voltage node.

A system, comprising:

• a buffer including a pad node and configured to:
• during non-failsafe operation, set a pad node voltage of the pad node based on an input signal;
• and
• during failsafe operation, set the pad node voltage based on a voltage of a failsafe node;
• and
• a circuit including:
• a first voltage setting transistor configured to operate in a conductive state to set the voltage of the failsafe node to a supply voltage of a supply voltage node;
• first and second control transistors configured to:
• control the first voltage setting transistor to operate in the conductive state in response to both the supply voltage and the pad node voltage corresponding to logical one;
• and
• control the first voltage setting transistor to operate in a nonconductive state in response to one of the supply voltage or the pad node voltage corresponding to the logical one and another one of the supply voltage or the pad node voltage corresponding to logical zero;
• a second voltage setting transistor configured to operate in the conductive state to set the voltage of the failsafe node to the pad node voltage in response to the supply voltage corresponding to the logical zero;
• and
• a third voltage setting transistor configured to operate in the conductive state to set the voltage of the failsafe node to the supply voltage in response to the pad node voltage corresponding to the logical zero.