EP0315473A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Output buffer having programmable drive current
Assignee: Texas Instruments Inc
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Filing: 1988-11-04
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Granted: —
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Expires: 2008-11-04
Abstract
Abstract The specification discloses output buffer circuitry (10) for providing selected output driving characteristics. A plurality of input terminals (13, 24 and 30) receive control and data signals. A plurality of interconnected driver transistors (20, 28, 36 and 42) are connected to an output terminal (22). Drive selector circuitry (16, 18, 38 and 40) is connected between the input terminals (13, 24, and 30) and is responsive to the control signals to vary the electrical interconnection of the driver transistors (20, 28, 36 and 42). The output driving characteristics presented to the output terminal (22) are variable in response to the control signals.
Inventors
- 👤 Edward H. Flaherty
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 14:04
CPC Classifications
H; H03; H03K; H03K19/00; H03K19/003; H03K19/00369; H03K19/00384; H03K19/0175; H03K19/0185; H03K19/018585; H03K5/00; H03K5/01; H03K5/02; H03K5/023
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
71 words
Circuitry for varying output driving characteristics comprising: a plurality of driver elements each connected to an output terminal; driver selector means connected to said driver elements; a plurality of inputs connected to said driver selector means for receiving a plurality of control signals; and said driver selector means responsive to said control signals for varying the electrical interconnection of said driver elements to vary the output driving characteristics of said circuitry.
Claim 2
Dependent Claim
71 words
Circuitry for varying output driving characteristics comprising: a plurality of driver elements each connected to an output terminal; driver selector means connected to said driver elements; a plurality of inputs connected to said driver selector means for receiving a plurality of control signals; and said driver selector means responsive to said control signals for varying the electrical interconnection of said driver elements to vary the output driving characteristics of said circuitry.
Claim 3
Dependent Claim
14 words
The circuitry of Claim 1, wherein the output impedance of said circuitry is varied.
Claim 4
Dependent Claim
15 words
The circuitry of Claim 1, wherein the output current capacity of said circuitry is varied.
Claim 5
Dependent Claim
15 words
The circuitry of Claim 1, wherein the response speed capacity of said circuitry is varied.
Claim 6
Dependent Claim
13 words
The circuitry of Claim 1 and further comprising: means for sensing environmental conditions.
Claim 7
Dependent Claim
17 words
The circuitry of Claim 1 wherein said driver elements comprise: at least two sets of driver transistors.
Claim 8
Dependent Claim
24 words
The circuitry of Claim 6, wherein said driver selector means is operable to vary the electrical connection of said two sets of driver transistors.
Claim 9
Dependent Claim
27 words
The circuitry of Claim 7 wherein said drive selector means is operable to electrically connect both sets of driver transistors together to provide a high current driver.
Claim 10
Dependent Claim
28 words
The circuitry of Claim 7, wherein said driver selector means is operable to electrically decouple one of said sets of driver transistors to provide a low current driver.
Claim 11
Dependent Claim
84 words
An output buffer providing selected output driving characteristics comprising: a plurality of input terminals for receiving control and data signals; a plurality of interconnected driver transistors; drive selector circuitry connected between said input terminals and said driver transistors and responsive to said control signals for varying the electrical interconnection of said driver transistors; and an output terminal connected to said driver transistors for outputting said data signals, the output driving characteristics presented to said output terminal being variable in response to said control signals.
Claim 12
Dependent Claim
84 words
An output buffer providing selected output driving characteristics comprising: a plurality of input terminals for receiving control and data signals; a plurality of interconnected driver transistors; drive selector circuitry connected between said input terminals and said driver transistors and responsive to said control signals for varying the electrical interconnection of said driver transistors; and an output terminal connected to said driver transistors for outputting said data signals, the output driving characteristics presented to said output terminal being variable in response to said control signals.
Claim 13
Dependent Claim
23 words
The output buffer of Claim 10, wherein said driver transistors comprise: at least two pair of driver transistors, each pair connected in parallel.
Claim 14
Dependent Claim
31 words
The output buffer of Claim 11, wherein all of said driver transistors are connected together in response to a first control signals to provide a fast, high current mode buffer circuit.
Claim 15
Dependent Claim
32 words
The output buffer of Claim 12, wherein one of said pair of driver transistors are decoupled in response to a second control signal to provide a slower, lower current mode buffer circuit.
Claim 16
Dependent Claim
29 words
The output buffer of Claim 13, wherein all of said driver transistors are decoupled in response to a third control signal to provide a high impedance mode buffer circuit.
Claim 17
Dependent Claim
21 words
The output buffer of Claim 10 and further comprising: means responsive to environmental characteristics for generating ones of said control signals.
Claim 18
Independent Claim
66 words
The method of varying the output drive characteristics of an output buffer comprising: applying control signals to the output buffer; applying data signals to the output buffer; varying the speed and impedance driving characteristics of the output buffer in response to said control signals; and generating output signals in response to said data signals, said output signals having the driving characteristics specified by said control signals.
Claim 19
Independent Claim
66 words
The method of varying the output drive characteristics of an output buffer comprising: applying control signals to the output buffer; applying data signals to the output buffer; varying the speed and impedance driving characteristics of the output buffer in response to said control signals; and generating output signals in response to said data signals, said output signals having the driving characteristics specified by said control signals.
Claim 20
Dependent Claim
20 words
The method of Claim 16 and further comprising: a first control signal by causing a fast, high current drive characteristic.
Claim 21
Dependent Claim
20 words
The method of Claim 16 and further comprising: a second control signal for causing a slow, low current drive characteristic.
Claim 22
Dependent Claim
19 words
The method of Claim 16 and further comprising: a third control signal for causing a high impedance drive characteristic.
Claim 23
Dependent Claim
34 words
The method of Claim 16, wherein said step of varying the speed and impedance driving characteristics of the output buffer comprises: varying the electrical interconnection of driving transistors in response to said control signals.
References Cited (Backward Citations)
No citation records indexed.
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