EP0083504A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
MOS type output driver circuit
Assignee: Fujitsu Ltd
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Filing: 1982-12-30
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Granted: —
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Expires: 2002-12-30
Abstract
Abstract A MOS type output driver circuit comprising an output circuit having first ans second MOS type output transistors (T 01 , T 02 ) connected between a voltage supply (Vcc) and the ground, the gates of the first and second output transistors (T 01 , T 02 ) respectively supplied with first and second drive signals (X, X - ) being mutually inverted, further comprising a protective circuit for (C 1 , C 2 and C 3 ) preventing the output transistors (T 01 , T 02 ) from being damaged by overcurrent when the output is shorted to the ground.
Inventors
- 👤 Yasuhiro Wakimoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 10:56
CPC Classifications
H; H03; H03K; H03K19/00; H03K19/003; H03K19/00315; H03K19/0175; H03K19/0185; H03K19/018507
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
210 words
A MOS type output driver circuit comprising: a voltage supplying means; a ground potential supplying means; an output means having a first output transistor having a gate for receiving a first drive signal, a second output transistor having a gate for receiving a second drive signal, said first and second output transistors being connected in series between said voltage supplying means and said ground potential supplying means, said first and second drive signals being complementary, and a connection point between said first and second output transistors being led out as an output of said output driver circuit; a detector means connected to said connection point for detecting whether an output level of said output means is lower than a reference voltage when said first output transistor is conductive; a control means connected to said gate of said first output transistor, said control means forcing the gate level of said first output transistor to be low in response to an output of said detector means so as to make said first output transistor off; and an inhibit means connected to said detector means, said inhibit means inhibitting said output of the detector means for a predetermined period after said second output transistor turns from a conductive state to a nonconductive state.
Claim 2
Dependent Claim
210 words
A MOS type output driver circuit comprising: a voltage supplying means; a ground potential supplying means; an output means having a first output transistor having a gate for receiving a first drive signal, a second output transistor having a gate for receiving a second drive signal, said first and second output transistors being connected in series between said voltage supplying means and said ground potential supplying means, said first and second drive signals being complementary, and a connection point between said first and second output transistors being led out as an output of said output driver circuit; a detector means connected to said connection point for detecting whether an output level of said output means is lower than a reference voltage when said first output transistor is conductive; a control means connected to said gate of said first output transistor, said control means forcing the gate level of said first output transistor to be low in response to an output of said detector means so as to make said first output transistor off; and an inhibit means connected to said detector means, said inhibit means inhibitting said output of the detector means for a predetermined period after said second output transistor turns from a conductive state to a nonconductive state.
Claim 3
Dependent Claim
131 words
A MOS type output driver circuit according to said detector means comprises a detector transistor, said detector transistor having a source connected to said connection point, a gate connected to the voltage supplying means, and a drain; said control means comprises a control transistor connected between said drain of the detector transistor and the gate of the first output transistor; and an inhibit means comprises a first and a second transistors connected in series between said voltage supplying means and said ground potential supplying means, said first transistor being depletion type transistor and and having a gate connected to a gate of said control transistor, said second transistor having a gate connected to said gate of said second output transistor, and a drain connected to the gate of said control transistor.
Claim 4
Dependent Claim
131 words
A MOS type output driver circuit according to said detector means comprises a detector transistor, said detector transistor having a source connected to said connection point, a gate connected to the voltage supplying means, and a drain; said control means comprises a control transistor connected between said drain of the detector transistor and the gate of the first output transistor; and an inhibit means comprises a first and a second transistors connected in series between said voltage supplying means and said ground potential supplying means, said first transistor being depletion type transistor and and having a gate connected to a gate of said control transistor, said second transistor having a gate connected to said gate of said second output transistor, and a drain connected to the gate of said control transistor.
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