Abstract A multiple input latching circuit which responds to the satisfaction of any one or more of a plurality of predetermined input signal conditions by the production of an output signal which persists (until reset) irrespective of any subsequent change in the input signals. The latching circuit comprises a plurality of circuit units, each of which includes a current switch which is placed into a predetermined current conduction condition upon the satisfaction of respective input signal conditions. Said conduction condition allows a predetermined fraction of a specified total current to flow through the circuit unit to an output load and, by feedback action, to trigger into conduction a latching current switch which causes all of the specified current to flow directly to said output load. The voltage drop across the output load provides the output signal from the latching circuit.
A multiple input latching circuit comprising: a plurality of circuit units connected in cascade, each said unit providing a respective portion of a total current along a first path upon satisfaction of predetermined respective input signal conditions and along a second path if said conditions are not satisfied, each said first path connecting to a current node, a first impedance element connecting said node to a source of voltage, and an actuatable latching current switch connected to each said unit and responsive to the current flowing into said current node for blocking when actuated the conduction of each said circuit unit and for applying said total current to said current node.
Claim 2
Dependent Claim
111 words
A multiple input latching circuit comprising: a plurality of circuit units connected in cascade, each said unit providing a respective portion of a total current along a first path upon satisfaction of predetermined respective input signal conditions and along a second path if said conditions are not satisfied, each said first path connecting to a current node, a first impedance element connecting said node to a source of voltage, and an actuatable latching current switch connected to each said unit and responsive to the current flowing into said current node for blocking when actuated the conduction of each said circuit unit and for applying said total current to said current node.
Claim 3
Dependent Claim
31 words
The circuit defined in claim 1 and further including: a second impedance element, said second impedance element being connected in series circuit between each said first path and said current node.
Claim 4
Dependent Claim
26 words
The circuit defined in claim 1 wherein the voltage at said current node is applied to said latching current switch for actuating said latching current switch.
Claim 5
Dependent Claim
35 words
The circuit defined in claim 2 wherein the voltage at the junction between said second impedance element and each said first path is applied to said latching current switch for actuating said latching current switch.
Claim 6
Dependent Claim
27 words
The circuit as defined in claim 3 and further including an output terminal, and means for coupling the voltage at said current node to said output terminal.
Claim 7
Dependent Claim
26 words
The circuit defined in claim 4 and further including an output terminal, and means for coupling the voltage at said current node to said output terminal.