Patent ID: 7558336
Filing Date: 2009-07-07
Classification: H03K

Abstract:
1. A semiconductor device comprising: a receiver circuit which receives digital data therein, said receiver circuit including, a first differential comparator which compares the digital data inputted thereto with a first reference voltage and thereby outputs binary data, a second differential comparator which compares said digital data with a second reference voltage, a variable voltage source which supplies said second reference voltage to the second differential comparator, a selector switch which selects one of the signals outputted from the first and second differential comparators, a latch which holds and outputs the selected signal output from the selector switch in accordance with a clock signal, and a controller which determines said second reference voltage corresponding to a history of data patterns obtained from the output signal of the latch and the output signal of the first differential comparator, wherein the variable voltage source is controlled by the controller and supplies said second reference voltage to the second differential comparator.