US4484091A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exclusive-OR circuit
Assignee: Toshiba Corp
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Filing: 1982-07-09
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Granted: 1984-11-20
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Expires: 2002-07-09
Abstract
Abstract Two flip-flop circuits are employed to provide a positive output and an its inversion output so as to produce the inverted signal of an input signal necessary to provide the function of an exclusive-OR circuit.
Inventors
- 👤 Katsumi Nagano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:05
CPC Classifications
H; H03; H03K; H03K19/00; H03K19/20; H03K19/21; H03K19/212
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
151 words
An exclusive-OR circuit comprising: a first flip-flop circuit of an open collector type for providing first and second complementary outputs in response to a pulse input; a second flip-flop circuit of an open collector type for providing first and second complementary outputs in response to a pulse input; an open collector type first inverter circuit having an input and an output, the input being connected to said first output of said first flip-flop circuit and to said second output of said second flip-flop circuit; an open collector type second inverter circuit having an input and an output, the input being connected to said second output of said first flip-flop circuit and to said first output of said second flip-flop circuit; and output means connected to the outputs of said first and second inverter circuits for providing a logical NAND function of the output signals of said first and second inverter circuits.
Claim 2
Dependent Claim
151 words
An exclusive-OR circuit comprising: a first flip-flop circuit of an open collector type for providing first and second complementary outputs in response to a pulse input; a second flip-flop circuit of an open collector type for providing first and second complementary outputs in response to a pulse input; an open collector type first inverter circuit having an input and an output, the input being connected to said first output of said first flip-flop circuit and to said second output of said second flip-flop circuit; an open collector type second inverter circuit having an input and an output, the input being connected to said second output of said first flip-flop circuit and to said first output of said second flip-flop circuit; and output means connected to the outputs of said first and second inverter circuits for providing a logical NAND function of the output signals of said first and second inverter circuits.
Claim 3
Dependent Claim
54 words
The exclusive-OR circuit according to claim 1, wherein the second output of each of said first and second flip-flop circuits is an inverted output of the first output, and said output means comprises an open collector type inverter circuit for producing an inverted product of the outputs of said first and second inverter circuits.
Claim 4
Dependent Claim
28 words
The exclusive-OR circuit according to claim 1, wherein the second output of each of said first and second flip-flop circuits is an inverted output of the first output.
Claim 5
Dependent Claim
31 words
The exclusive-OR circuit according to claim 1, 2 or 3, wherein said first and second flip-flop circuits and said first and second inverter circuits are each composed of integrated-injection logic gates.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-20 | 1988-05-21 | 1988-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-20 | 1992-05-21 | 1992-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-20 | 1996-05-21 | 1996-11-20 | $7700.00 | Window Closed / Lapsed |