| US 7,545,614 B2 | ||
| Electrostatic discharge device with variable on time | ||
| Kevin Traynor, Cary, N.C. (US); Russell C. Deans, Durham, N.C. (US); and Vincent J. Acierno, Chapel Hill, N.C. (US) | ||
| Assigned to Renesas Technology America, Inc., San Jose, Calif. (US) | ||
| Filed on Sep. 30, 2005, as Appl. No. 11/239,130. | ||
| Prior Publication US 2007/0076338 A1, Apr. 05, 2007 | ||
| Int. Cl. H02H 9/00 (2006.01) | ||
| U.S. Cl. 361—56 | 23 Claims |
| 1. An electrostatic discharge protection device for limiting the effects of electrostatic discharge, comprising:
a first resistor connected in series with a first capacitor between an input voltage rail and a substrate voltage rail;
a mosfet transistor having a gate terminal connected to a node between the first resistor and the first capacitor, and a source
terminal connected to the input voltage rail;
a second resistor and a second capacitor connected in parallel to one another between the drain terminal of the mosfet transistor
and the substrate voltage rail;
a blocking device connected to the second resistor and the second capacitor; and
a second transistor having its drain terminal and source terminal connected between the voltage rails and its gate terminal
connected to the cathode of the blocking device,
wherein the blocking device is connected in series with the drain of the mosfet transistor and the gate terminal of the second
transistor.
|