Patent ID: 7054122

Claim:
An interated circuit, comprising: a core voltage source; an input-output voltage source; a low voltage source; a core circuit having a first end coupled to the core voltage source and a second end coupled to the low voltage source; a first clamp circuit having a first end coupled to the core voltage source and a second end coupled to the low voltage source; a second clamp circuit having a first end coupled to the input-output voltage source and a second end coupled to the core voltage source; a pad; a pull up clamp circuit having a first end coupled to the input-output voltage source and a second end coupled to the pad; a pull down clamp circuit having first end coupled to the pad and a second end coupled to the low voltage source; wherein the first clamp circuit is fabricated by a process which fabricates the core circuit to avoid an electrostatic discharge current passing through the core circuit; and wherein the pull up clamp circuit and the pull down clamp circuit are for providing an electrostatic discharge current path.