Patent US4800295A successfully refreshed from Google Patents.
US4800295A
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Retriggerable monostable multivibrator
Assignee: Seagate Technology LLC
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Filing: 1988-03-29
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Granted: 1989-01-24
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Expires: 2008-03-29
Abstract
Abstract A retriggerable monostable multivibrator according to the present invention comprises a bistable device, such as S-R latch, responsive to the output of a pulse former to provide a set output. A propagation chain, comprising a plurality of serially arranged gates, propagates the latch output to form a delayed reset signal. The reset signal operates to reset the bistable latch. Gate means is connected to the true output of the latch, and to the propagation chain, to provide an output pulse for the duration of the true output and reset signal. The gates of the propagation chain are also connected to the pulse former so that the propagation of the reset signal is terminated in the event a second input pulse occurs prior to termination of the reset signal. The latch is again set and the output pulse is thereby extended by a time period equal to the predetermined time period established by the true condition of the latch, the propagation of the reset signal through the propagation chain, and the reset time of latch. Modifications describe variations of the propagation chain as including AND gates, OR gates, NOR gates and inverters.
Inventors
- 👤 Vadim B. Minuhin
- 👤 Vernon F. Von Deylen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:02
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/14; G11B20/1403; G11B20/1423; G11B20/1426
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
141 words
A retriggerable monostable multivibrator comprising: bistable means responsive to an input pulse for setting the bistable means to a first output state and responsive to a reset signal for resetting the bistable means to a second output state, said second output state being opposite said first output state; and propagation chain means responsive to the first output state of said bistable means for providing said reset pulse signal upon a predetermined period after said bistable means is set to its first output state, said propagation chain means being responsive to said input pulse for cancelling a reset signal in process of being provided; and output means responsive to said bistable means and to said propagation chain means for producing an output pulse while either said bistable means is in its first output state or said propagation means provides said reset signal.
Claim 2
Dependent Claim
141 words
A retriggerable monostable multivibrator comprising: bistable means responsive to an input pulse for setting the bistable means to a first output state and responsive to a reset signal for resetting the bistable means to a second output state, said second output state being opposite said first output state; and propagation chain means responsive to the first output state of said bistable means for providing said reset pulse signal upon a predetermined period after said bistable means is set to its first output state, said propagation chain means being responsive to said input pulse for cancelling a reset signal in process of being provided; and output means responsive to said bistable means and to said propagation chain means for producing an output pulse while either said bistable means is in its first output state or said propagation means provides said reset signal.
Claim 3
Dependent Claim
41 words
Apparatus according to claim 1 further including input means responsive to a data signal for producing said input pulse, said input means comprising an edge detector and pulse generator for producing input pulses in response to edges of said data signal.
Claim 4
Dependent Claim
98 words
Apparatus according to claim 1 wherein said propagation chain means comprises a plurality of gates each having a first input connected to receive said input pulse and having an output, said plurality of gates being arranged in a chain such that the output of each gate except the last gate of said chain is connected to a second input of the next gate of the chain and the output of the last gate of the chain is connected to said output means, and the first gate of said chain having a second input connected to said bistable means.
Claim 5
Dependent Claim
14 words
Apparatus according to claim 3 wherein said gates of said chain are AND gates.
Claim 6
Dependent Claim
14 words
Apparatus according to claim 3 wherein said gates of said chain are OR gates.
Claim 7
Dependent Claim
17 words
Apparatus according to claim 3 wherein at least some of said gates of said chain are inverters.
Claim 8
Dependent Claim
13 words
Apparatus according to claim 3 wherein said output means comprises an OR gate.
Claim 9
Dependent Claim
22 words
Apparatus according to claim 1 wherein said bistable means comprises an S-R latch having set and reset inputs and a true output.
Claim 10
Dependent Claim
102 words
Apparatus according to claim 8 wherein said propagation chain means comprises a plurality of gates each having a first input connected to receive said input pulse and having an output, said plurality of gates being arranged in a chain such that the output of each gate except the last gate of said chain is connected to a second input of the next gate of the chain and the output of the last gate of the chain is connected to said output means, and the first gate of said chain having a second input connected to the true output of said S-R latch.
Claim 11
Dependent Claim
41 words
Apparatus according to claim 9 wherein said output means comprises an OR gate having a first input connected to said true output of said S-R latch and a second input connected to the output of the last gate of said chain.
Claim 12
Dependent Claim
72 words
Apparatus according to claim 10 further including input means responsive to a data signal for producing said input pulse, said input means comprising an edge detector and pulse generator for producing input pulses in response to edges of said data signal, and means for producing an inverse pulse opposite to said input pulse, said first input of each of said gates being connected to said last-named means to receive said inverse pulse.
Claim 13
Dependent Claim
14 words
Apparatus according to claim 9 wherein said gates of said chain are AND gates.
Claim 14
Dependent Claim
14 words
Apparatus according to claim 9 wherein said gates of said chain are OR gates.
Claim 15
Dependent Claim
17 words
Apparatus according to claim 9 wherein at least some of said gates of said chain are inverters.
Claim 16
Dependent Claim
72 words
Apparatus according to claim 9 further including input means responsive to a data signal for producing said input pulse, said input means comprising an edge detector and pulse generator for producing input pulses in response to edges of said data signal, and means for producing an inverse pulse opposite to said input pulse, said first input of each of said gates being connected to said last-named means to receive said inverse pulse.
Claim 17
Dependent Claim
14 words
Apparatus according to claim 15 wherein said gates of said chain are AND gates.
Claim 18
Dependent Claim
14 words
Apparatus according to claim 15 wherein said gates of said chain are OR gates.
Claim 19
Dependent Claim
17 words
Apparatus according to claim 15 wherein at least some of said gates of said chain are inverters.
References Cited (Backward Citations)
US3761743A
Cited
US3768026A
Cited
US4061975A
Cited
US3979746A
Cited
US4001716A
Cited
US4423338A
Cited
US4583008A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-24 | 1992-07-25 | 1993-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-24 | 1996-07-25 | 1997-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-24 | 2000-07-25 | 2001-01-24 | $7700.00 | Window Closed / Lapsed |