Patent US3739349A successfully refreshed from Google Patents.
US3739349A
Expired / Lapsed
US
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Digital equipment interface unit
Assignee: SP-MICROWAVE Inc
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Filing: 1971-05-24
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Granted: 1973-06-12
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Expires: 1991-05-24
Abstract
Abstract A programmable interface unit for use with automatic digital test equipment having a plurality of generator/comparator units which couple stimuli signals from a plurality of shift registers to a unit under test and evaluate output signals produced by the unit under test in response to the stimuli signals by comparing the output signals to programmable reference levels. Each terminal of the interface unit coupled between the generator/comparators and the unit under test may be employed alternately by appropriate programming to function as either a stimuli output to the unit under test or as an input to a comparator of an output signal produced by the unit under test.
Inventors
- 👤 W Burdette
- 👤 D Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:34
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/28; G01R31/317; G01R31/3181; G01R31/319; G01R31/31917; G01R31/31919
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
229 words
An interface device for coupling between electronic test apparatus and equipment under test having a plurality of input/output terminals, each of said input/output terminals to be used as either an output terminal for applying stimuli signals to the equipment under test or as an input terminal for receiving signals produced by said equipment under test, said interface device comprising: a source of stimuli signals for simultaneously providing a plurality of different stimuli signals, stimuli selector means coupled to said source of stimuli Signals for automatically selecting specific stimuli signals to be transferred to said equipment under test via said input/output terminals of said interface device, switching means coupled between said selector means and said interface input/output terminals for controlling the transfer of said stimuli signals from said selector means to said equipment under test, a source of reference signals, control means coupled to said stimuli selector means for producing control signals, and comparator means having first input terminals for receiving said signals produced by said equipment under test from said interface input/output terminals, second input terminals coupled to said source of reference signals and third input terminals coupled to said control means for comparing signals from said equipment under test appearing at said interface input/output terminals to a reference signal selected in accordance with said control signals thereby producing an output signal indicative of the result of said comparison.
Claim 2
Dependent Claim
229 words
An interface device for coupling between electronic test apparatus and equipment under test having a plurality of input/output terminals, each of said input/output terminals to be used as either an output terminal for applying stimuli signals to the equipment under test or as an input terminal for receiving signals produced by said equipment under test, said interface device comprising: a source of stimuli signals for simultaneously providing a plurality of different stimuli signals, stimuli selector means coupled to said source of stimuli Signals for automatically selecting specific stimuli signals to be transferred to said equipment under test via said input/output terminals of said interface device, switching means coupled between said selector means and said interface input/output terminals for controlling the transfer of said stimuli signals from said selector means to said equipment under test, a source of reference signals, control means coupled to said stimuli selector means for producing control signals, and comparator means having first input terminals for receiving said signals produced by said equipment under test from said interface input/output terminals, second input terminals coupled to said source of reference signals and third input terminals coupled to said control means for comparing signals from said equipment under test appearing at said interface input/output terminals to a reference signal selected in accordance with said control signals thereby producing an output signal indicative of the result of said comparison.
Claim 3
Dependent Claim
29 words
An interface device as described in claim 1 in which said stimuli selector means includes register means coupled to said source of stimuli signals for storing selected stimuli signals.
Claim 4
Dependent Claim
37 words
An interface device as described in claim 2 which includes a delay means responsive to external gating and coupled to said register means for controlling the transfer of said selected stimuli signals stored in said register means.
Claim 5
Dependent Claim
24 words
An interface device as described in claim 2 in which said register means includes a plurality of 8 bit shift registers coupled in parallel.
Claim 6
Dependent Claim
34 words
An interface device as described in claim 2 in which said stimuli selector means includes decoder means responsive to programmed data input signals and coupled to said register means for providing output selector signals.
Claim 7
Dependent Claim
45 words
An interface device as described in claim 5 in which said decoder means includes an integrated circuit device that converts said programmed data input signals in the form of a digital number into corresponding output pulses on respective ones of a plurality of output terminals.
Claim 8
Dependent Claim
29 words
An interface device as described in claim 1 in which said source of stimuli signals includes means for simultaneously providing digital ones, zeroes, clock pulses and clock frequency signals.
Claim 9
Dependent Claim
22 words
An interface device as described in claim 1 in which said control means includes delay means responsive to programmable bit input signals.
Claim 10
Dependent Claim
21 words
An interface device as described in claim 8 in which said delay means includes a plurality of 4 bit latch circuits.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |