Static information storage and retrieval – Systems using particular element – Flip-flop
Patent
1996-07-19
1997-08-19
Nelms, David C.
Static information storage and retrieval
Systems using particular element
Flip-flop
36518905, G11C 1100
Patent
active
056594984
ABSTRACT:
A latch circuit that is intentionally unbalanced, so that a first output reaches ground voltage and a second output reaches a supply voltage. The latch circuit may be used with a fully static low-consumption fuse circuit which reverses the first and second outputs of the latch circuit when the fuse is in an unprogrammed state, but does not change the outputs of the latch circuit in the programmed state. In particular, the latch circuit has a first transistor of a first polarity series connected at a first output node with a second transistor of a second polarity between a supply voltage and a ground voltage. A third transistor of the first polarity is series connected at a second output node with a fourth transistor of the second polarity between the supply voltage and the ground voltage. The gate terminals of the first and second transistors are connected to the second output, while the gate terminals of the third and fourth transistors are connected to the first output. The first and third transistors have thresholds which are mutually different, and the second and fourth transistors have thresholds which are mutually different, so that the first output reaches ground voltage and the second output reaches the supply voltage. This circuit can be combined with a fuse circuit, such as a dual gate transistor.
REFERENCES:
patent: 3848236 (1974-11-01), Troutman
patent: 4195239 (1980-03-01), Suzuki
patent: 4669063 (1987-05-01), Kirsch
patent: 4811290 (1989-03-01), Watanabe
patent: 5063537 (1991-11-01), Akrout et al.
patent: 5294819 (1994-03-01), Simko
Barcella Antonio
Fontana Marco
Pascucci Luigi
Rolandi Paolo
Morris James H.
Nelms David C.
Nguyen Hien
SGS--Thomson Microelectronics S.r.l.
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