Static information storage and retrieval – Read/write circuit – Flip-flop used for sensing
Patent
1985-01-24
1987-01-20
Moffitt, James W.
Static information storage and retrieval
Read/write circuit
Flip-flop used for sensing
G11C 700
Patent
active
046384634
ABSTRACT:
A fast writing circuit is disclosed for a soft error protected storage cell, such as a latch. The protected latch has a first input/output node and a second input/output node which are respectively connected to a charging source. The latch is connected to a first binary state input device which is enabled by a write-enable input, the first node being selectively charged during a write interval when the write-enable input is on, to represent a stored, first binary logic state for the latch. The soft error protection circuit includes an insulated gate, field effect capacitor having a diffusion electrode connected to the second node and having a gate electrode, for selectively loading the second node with an additional capacitance when its gate is biased with respect to the diffusion electrode. The soft error protection circuit further includes an inverter circuit having an input connected to the second node and an output for applying a capacitance enhancing bias to the gate electrode of the capacitor, for capacitively loading the second node. The fast writing circuit disclosed herein has an insulated gate field effect transistor disabling device having its source connected to ground potential, its drain connected to the gate to the capacitor and its gate connected to the write-enable input, for removing the bias on the gate of the capacitor in response to the write-enable input, thereby minimizing the capacitive load on the second node during the write interval. In this manner, the soft error protected latch can be written into at a faster rate than has been previously possible.
REFERENCES:
patent: 4314359 (1982-02-01), Kato et al.
patent: 4404661 (1983-09-01), Nagayama et al.
patent: 4448400 (1984-05-01), Harari
Electronics--May 22, 1980; pp. 119-129.
Hoel John E.
International Business Machines - Corporation
Moffitt James W.
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