Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Junhyeong Ryu0
Moonho Kim0
Taeghyun Kang0
Date of Patent
November 16, 2010
0Patent Application Number
118462310
Date Filed
August 28, 2007
0Patent Citations Received
Patent Primary Examiner
Patent abstract
A composite dual SCR circuit that acts to protect the Vcc node as well as an I/O node or pin. The dual SCR uses the Vcc to control or program the triggering point of the SCR connected to an I/O node. When Vcc is low, the SCR protecting an I/O node triggers a few volts above ground, but when Vcc is high the trigger point of the SCR protecting the I/O node is much higher. The dual SCR incorporates added diffusions to an existing first SCR structure between the power node and the ground node thereby forming a second SCR. The first and second SCRs share a common cathode transistor. In one illustrative embodiment, only one SCR is constructed incorporating the Vcc to control the triggering of the SCR.
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