| 摘要 |
A circuit and a method for on die termination of a semiconductor memory apparatus are provided to adjust a code value accurately regardless of an offset voltage and to prevent the code value from being changed into an abnormal value. A comparison unit outputs a comparison result signal by comparing a code voltage corresponding to a code with a reference voltage. A counting unit(130,230) changes the code according to the comparison result signal. A control unit(400,500) controls the operation of the counting unit according as a prior value of the comparison result signal coincides with the present value. The comparison unit comprises a first and a second comparator(120,220) operating at different timing.
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