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Set Dominant NOR Latch

IP.com Disclosure Number: IPCOM000096689D
Original Publication Date: 1963-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Earle, J: AUTHOR

Abstract

This latch reliably sets if there is any significant overlap between set and reset signals, when pulsed. For distinct set and reset signals, the latch provides an up or a 1 signal and a down or 0 signal, respectively.

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Set Dominant NOR Latch

This latch reliably sets if there is any significant overlap between set and reset signals, when pulsed. For distinct set and reset signals, the latch provides an up or a 1 signal and a down or 0 signal, respectively.

The latch comprises four Nor's described in U. S. Patent 3,040,198. Nor's provide an output which is the inverse of one or more like signals which have a polarity suitable for changing the conducting condition of a transistor included in such circuits.

Nor 20 receives as a first input a S circuit which supplies a notset signal. The output of Nor 20 is a first input to a second Nor 30 and a fourth Nor 50. Nor 30 provides an output f, which has setdominant operation, and a second input to Nor 20. Nor 40 receives as a first input a R circuit which supplies a not reset input signal.

The output of the Nor 40 is a second input to fourth Nor 50. Nor 50 circuit provides second inputs to Nor's 30 and 40.

Set dominant operation is defined as the f output being a 0, when both set and reset inputs are pulsed or receive 1 signals. Assuming a 1 output at terminal f and like 0 inputs to Nor's 20 and 50, the outputs of Nor's 20, 30, 40 and 50 are 0, 1, 1 and 0, respectively. Like 1 inputs to Nor's 20 and 50 develop outputs 0, 0, 0 and 1 at Nor's 20, 30, 40 and 50, respectively. Accordingly, the output f is a 0 corresponding to the output of Nor 30. Like 0 inputs to Nor's 20 and 40 change the outputs of Nor's 20, 40 and 50 to 1, 1, and 0. Nor...