US3700929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integrated bistable circuit
Assignee: Motorola Solutions Inc
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Filing: 1972-01-10
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Granted: 1972-10-24
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Expires: 1992-01-10
Abstract
Abstract A protected monolithic integrated flip-flop circuit comprises a pair of NPN transistors as the active flip-flop elements with the collectors of each of these transistors being supplied from a constant current source in the form of a dual-collector lateral PNP transistor. Collector-to-substrate distributed capacitance operates to retard the switching time of the flip-flop causing it to be a low speed flip-flop. A pair of substrate PNP transistors are used to apply the input trigger signals to the NPN transistors and operate to provide protection for the circuit against high positive or negative input voltages.
Inventors
- 👤 Thomas M Frederiksen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:05
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/26; H03K3/28; H03K3/281; H03K3/286; H03K3/288
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
200 words
A monolithic integrated bistable multivibrator circuit including in combination: first and second DC supply terminals; first and second transistors of the same conductivity type and each having first, second and control electrodes; means coupling the second electrodes of said first and second transistors with said second supply terminal; means coupling the first electrode of said first transistor with the control electrode of said second transistor; means coupling the first electrode of said second transistor with the control electrode of said first transistor; first and second constant current sources coupled between said first supply terminal and the first electrodes of said first and second transistors, respectively; third and fourth transistors of opposite conductivity type to the conductivity type of said first and second transistors, said third and fourth transistors each having first, second and control electrodes, with the first electrodes thereof coupled with said second supply terminal; means coupling the second electrode of said third transistor with the first electrode of said first transistor; means coupling the second electrode of said fourth transistor with the first electrode of said second transistor; and means for applying trigger signals to the control electrode of at least one of said third and fourth transistors.
Claim 2
Dependent Claim
200 words
A monolithic integrated bistable multivibrator circuit including in combination: first and second DC supply terminals; first and second transistors of the same conductivity type and each having first, second and control electrodes; means coupling the second electrodes of said first and second transistors with said second supply terminal; means coupling the first electrode of said first transistor with the control electrode of said second transistor; means coupling the first electrode of said second transistor with the control electrode of said first transistor; first and second constant current sources coupled between said first supply terminal and the first electrodes of said first and second transistors, respectively; third and fourth transistors of opposite conductivity type to the conductivity type of said first and second transistors, said third and fourth transistors each having first, second and control electrodes, with the first electrodes thereof coupled with said second supply terminal; means coupling the second electrode of said third transistor with the first electrode of said first transistor; means coupling the second electrode of said fourth transistor with the first electrode of said second transistor; and means for applying trigger signals to the control electrode of at least one of said third and fourth transistors.
Claim 3
Dependent Claim
83 words
The combination according to claim 1 further including means for applying a positive operating potential to said first supply terminal and means for connecting said second supply terminal to a point of reference potential, wherein said first and second transistors are NPN transistors, having collector, emitter, and base electrodes corresponding to the first, second and control electrodes, respectively, and said third and fourth transistors are substrate PNP transistors, having collector, emitter, and base electrodes corresponding to the first, second and control electrodes, respectively.
Claim 4
Dependent Claim
81 words
The combination according to claim 2 wherein said first and second current sources are provided by a dual-collector lateral PNP transistor, having base, emitter and first and second collector electrodes, with the emitter thereof connected to said first supply terminal and the first and second collectors thereof connected with the collectors of said first and second transistors, respectively, and further including means for supplying a temperature and voltage stabilized DC operating potential to the base of said dual-collector lateral PNP transistor.
Claim 5
Dependent Claim
29 words
The combination according to claim 3 further including first and second pinch resistors connected between said second supply terminal and the bases of said first and second transistors, respectively.
Claim 6
Dependent Claim
112 words
A monolithic integrated bistable multivibrator circuit including in combination: first and second DC supply terminals; first and second transistors of the same conductivity type, each having first, second and control electrodes; means coupling the second electrodes of said first and second transistors with said second supply terminal; means coupling the first electrode of each of said transistors with the control electrode of the other of said transistors; first and second current sources coupled between said first supply terminal and the first electrodes of said first and second transistors, respectively; and first and second pinch resistors coupled between said second supply terminal and the control electrodes of said first and second transistors, respectively.
Claim 7
Dependent Claim
112 words
A monolithic integrated bistable multivibrator circuit including in combination: first and second DC supply terminals; first and second transistors of the same conductivity type, each having first, second and control electrodes; means coupling the second electrodes of said first and second transistors with said second supply terminal; means coupling the first electrode of each of said transistors with the control electrode of the other of said transistors; first and second current sources coupled between said first supply terminal and the first electrodes of said first and second transistors, respectively; and first and second pinch resistors coupled between said second supply terminal and the control electrodes of said first and second transistors, respectively.
Claim 8
Dependent Claim
65 words
The combination according to claim 5 wherein said means coupling the first electrode of each of said transistors with the control electrode of the other comprises first diode means coupling the first electrode of said first transistor with the control electrode of said second transistor and second diode means coupling the first electrode of said second transistor with the control electrode of said first transistor.
Claim 9
Dependent Claim
103 words
The combination according to claim 5 further including third and fourth transistors of a conductivity type opposite to the conductivity type of said first and second transistors, said third and fourth transistor each having first, second and control electrodes, with the second electrodes of the third and fourth transistors being coupled to the first electrodes of said first and second transistors, respectively, the first electrodes of said third and fourth transistors being connected with the second supply terminal; and means for applying input signals to the control electrodes of said third and fourth transistors to change the conductivity state of the multivibrator circuit.
Claim 10
Dependent Claim
76 words
The combination according to claim 5 wherein said first and second current sources are active constant current sources, the combination further including a voltage divider comprising diode means and resistance means connected together at a junction and connected in series between said first and second supply terminals to form a voltage divider, with the junction being coupled to said first and second constant current sources for providing a biasing potential to establish the current supplied thereby.
Claim 11
Dependent Claim
88 words
The combination according to claim 8 wherein said first and second constant current sources comprise transistor means having at least control, second and a pair of first electrodes, the control electrode being coupled to the junction on said voltage divider means, said second electrode being connected with said first supply terminal and said first electrodes being connected with the first electrodes of said first and second transistors, said current source transistor means being of a conductivity type opposite to the conductivity type of said first and second transistors.
Claim 12
Dependent Claim
84 words
The combination according to claim 9 wherein said first and second transistors have collector, emitter and base electrodes corresponding respectively to the first, second, and control electrodes and said current source transistor means includes a dual-collector transistor having base, emitter, and first and second collectors, with the base corresponding to the control elEctrode the emitter corresponding to the second electrode and the first and second collectors corresponding to the pair of first electrodes connected to the collectors of said first and second transistors, respectively.
Claim 13
Dependent Claim
71 words
The combination according to claim 10 wherein said dual-collector current source transistor is a lateral PNP transistor said first and second transistors are NPN transistors, and further including first diode means connected to conduct current from the collector of said first transistor and the base of said second transistor and second diode means connected to conduct current from the collector of said second transistor to the base of said first transistor.
References Cited (Backward Citations)
US3272997A
Cited
US3345583A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |