Output circuit for semiconductor device, semiconductor device having output circuit, and method of adjusting characteristics of output circuit
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United States of America Patent
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May 2, 2017
Issued Date -
N/A
app pub date -
Jun 9, 2016
filing date -
Jan 19, 2005
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Abstract
To decrease the circuit scale necessary for the calibration of the output circuit and to decrease the time required for the calibration operation. The invention includes a first output buffer and a second output buffer that are connected to a data pin, and a calibration circuit that is connected to a calibration pin. The first output buffer and the second output buffer include plural unit buffers. The unit buffers have mutually the same circuit structures. With this arrangement, the impedances of the first output buffer and the second output buffer can be set in common, based on the calibration operation using the calibration circuit. Consequently, both the circuit scale necessary for the calibration operation and the time required for the calibration operation can be decreased.
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