Patent ID: 6111780
Filing Date: 2000-08-29
Classification: G11C,H01L

Abstract:
A radiation hardened storage cell, comprising in combination:a first inverter pair comprised of a first PFET and a first NFET coupled in series drain to drain by a resistor whose resistance is an order of magnitude larger than the source to drain resistance of the first PFET;said first PFET including a P+ drain diffusion in an NWELL with a portion of the gate overlying the P+ drain diffusion;a second inverter pair comprised of a second PFET and a second NFET coupled in series drain to drain by a resistor whose resistance is an order of magnitude larger than the source to drain resistance of the second PFET;said second PFET including a P+ drain diffusion in an NWELL with a portion of the gate overlying the P+ drain diffusion;a first pass gate PFET coupled to the gate of said first PFET, the gate of said first NFET, and the P+ drain diffusion of said second PFET; anda second pass gate PFET coupled to the gate of said second PFET, the gate of said second NFET, and the P+ drain diffusion of said first PFET.