Semiconductor device allowing accurate characteristics test
First Claim
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1. A semiconductor device on a chip providing a potential at a prescribed internal node to an external terminal of said chip in a prescribed mode, comprising:
- a first designating signal output means responsive to a first external control signal from off said chip outputting a first designating signal designating said prescribed mode;
a second designating signal output means responsive to a second external control signal from off said chip and to said first designating signal for outputting a second designating signal to activate a connection to said external terminal; and
output means responsive to said second designating signal for connecting the potential of said prescribed internal node to said external terminal of said chip.
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Abstract
In response to an external control signal, a first timing detecting circuit and a high voltage detecting circuit detect setting of a signature mode and provide a signature mode signal to a second timing detecting circuit. The second timing detecting circuit outputs an output buffer activating signal to the output buffer in response to the external control signal. In response to the output buffer activating signal, the output buffer detects an internal supply voltage and provides the same to an external pin.
20 Citations
20 Claims
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1. A semiconductor device on a chip providing a potential at a prescribed internal node to an external terminal of said chip in a prescribed mode, comprising:
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a first designating signal output means responsive to a first external control signal from off said chip outputting a first designating signal designating said prescribed mode; a second designating signal output means responsive to a second external control signal from off said chip and to said first designating signal for outputting a second designating signal to activate a connection to said external terminal; and output means responsive to said second designating signal for connecting the potential of said prescribed internal node to said external terminal of said chip. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 20)
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17. A semiconductor device on a chip, comprising:
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voltage lowering means for converting an external input signal having a first potential to a signal having a third potential by lowering the potential by a second potential; detecting means for outputting, when the potential of said signal of the third potential is higher than a fourth potential, a prescribed first potential detecting signal; and adjusting means for adjusting one of said second potential or said fourth potential in response to an external control signal from off said chip. - View Dependent Claims (18, 19)
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Specification