Latching circuit with logic operation

Details Latching circuit with logic operation Latching circuit with logic operation

1992-10-28

1994-06-14

Wambach, Margaret Rose

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307473, 307481, 307289, 307291, 307353, H03K 1902, H03K 326

Patent

active

053213165

ABSTRACT:
A latching circuit comprises: a logic gate circuit having N inputs, such as NAND or NOR; N first switches responsive to a control signal indicative of a latching and non-latching modes for connecting N input terminals to said N inputs respectively in said non-latching mode; a signal producing circuit for producing a signal at an output thereof in response to said logic output; a second switches for connecting said output to said one input in said latching mode; (N-1) third switches responsive to said control signal for connecting N-1 inputs of said N inputs other than said one input to a logic level respectively in said latching mode, said logic level being determined such that said logic outputs is determined by a logic level of said one input in said latching mode, said signal producing circuit producing said signal such that said logic gate circuit holds said logic output in said latching mode. An AND gate and OR gate can be used also. The second and third switches can be replaced with resistive elements. All inputs of the logic circuit may be fed back to latch the output level.

REFERENCES:
patent: 4112296 (1978-09-01), Heimbigner et al.
patent: 4974241 (1990-11-01), McClure et al.
patent: 5003513 (1991-03-01), Porter et al.

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