US 11,799,288 B2
Electrostatic protection circuit and semiconductor integrated circuit
Hiroshi Uemura, Osaka (JP); and Keiji Tanaka, Osaka (JP)
Assigned to SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka (JP)
Filed by SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka (JP)
Filed on Nov. 17, 2021, as Appl. No. 17/528,861.
Claims priority of application No. 2020-192377 (JP), filed on Nov. 19, 2020.
Prior Publication US 2022/0158448 A1, May 19, 2022
Int. Cl. H02H 9/04 (2006.01); H01L 27/02 (2006.01)
CPC H02H 9/046 (2013.01) [H01L 27/0266 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An electrostatic protection circuit comprising:
a first output terminal and a second output terminal;
a first node;
a second node different from the first node;
a first diode circuit connected between the first output terminal and the first node;
a second diode circuit connected between the second output terminal and the first node;
a first intermediate voltage circuit including a first dividing resistor, and a second dividing resistor, the first dividing resistor being connected between the first output terminal and the second node, and the second dividing resistor being connected between the second output terminal and the second node;
a detection circuit configured to generate a trigger signal in accordance with a voltage at the second node, the detection circuit being connected between the second node and a ground line; and
a switch circuit configured to electrically connect the first node to the ground line in accordance with the trigger signal, the switch circuit being connected between the first node and the ground line.