Patent ID: 6097235
Filing Date: 2000-08-01
Classification: H01L

Abstract:
A field device electrostatic discharge protective circuit, which is connected to and between an input port and an internal circuit to protect the internal circuit, comprising:an N-type field effect transistor, wherein the drain and the gate of the N-type field effect transistor are coupled to the input port;an N-type metal oxide semiconductor, wherein the drain of the N-type metal oxide semiconductor is coupled to the internal circuit, the source of N-type metal oxide semiconductor is coupled to ground, and the gate of the N-type metal oxide semiconductor is coupled to the source of the N-type field effect transistor;an impedance device connected to and between the source of the N-type field effect transistor and the ground; anda resistor connected to and between the drain of the N-type field effect transistor and the drain of the N-type metal oxide semiconductor.