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US 4,791,315 AGranted
Cross-coupled latch
AssigneeCherry Semiconductor Corporation
InventorWalter S. Gontowski, Jr.
Life of this patent
Estimating the term…
Abstract
A cross-coupled latch circuit in which first and second switching transistors are each connected as a current mirror with a diode. The base of each switching transistor is cross-coupled to the collector of the other switching transistor by a resistor and a diode. The collector of each switching transistor is connected to the voltage source terminal by a resistor. The switching transistors are prevented from saturating in their low states so as to increase switching speed.
Claims9
A cross-coupled latch circuit comprising:
- means for receiving a voltage;
- a first resistor having one end connected to said voltage receiving means and having an other end;
- a second resistor having one end connected to said voltage receiving means so that said second resistor is in parallel with said first resistor and having an other end;
- a first diode connected in series between said second resistor and ground;
- a second diode connected in series between said first resistor and ground;
- a first switching transistor having a collector coupled to the other end of said first resistor and having a base and emitter connected across said first diode so that the current in said first diode is mirrored and multiplied through said first switching transistor;
- a second switching transistor having a collector coupled to the other end of said second resistor and having a base and emitter connected across said second diode so that the current in said second diode is mirrored and multiplied through said second switching transistor;
- means connected to said first switching transistor for setting said latch circuit;
- and
- means connected to said second switching transistor for resetting said latch circuit.
7 more elements
Dependencies are inferred from the claim text.