Complementary-SCR electrostatic discharge protection circuit

Details Complementary-SCR electrostatic discharge protection circuit Complementary-SCR electrostatic discharge protection circuit

1995-03-17

1995-12-05

Monin, Donald L.

Active solid-state devices (e.g., transistors, solid-state diode

Regenerative type switching device

Device protection

257362, 257363, 361 91, 361100, H01L 2974, H01L 2906

Patent

active

054731690

ABSTRACT:
A complementary-SCR electrostatic discharge protection circuit in a silicon substrate, coupling to I/O pads for bypassing electrostatic current of positive or negative polarity respect to power supply voltages V.sub.DD and V.sub.SS. The circuit comprises a first SCR and a second SCR each having an anode, a cathode, an anode gate and a cathode gate. The circuit of the present invention preferably includes a finger type layout structure for providing a larger capacity to bypass electrostatic current. It is also characterized by a base-emitter shorting design to avoid a V.sub.DD -to-V.sub.SS latch-up effect.

REFERENCES:
patent: 4939616 (1990-07-01), Rountree
patent: 5012317 (1991-04-01), Rountre
patent: 5235201 (1993-08-01), Honna
patent: 5272371 (1993-12-01), Bishop et al.
patent: 5359211 (1994-10-01), Croft

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