Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
February 24, 2009
1Patent Application Number
116476691
Date Filed
December 29, 2006
1Patent Primary Examiner
Patent abstract
A delay selection circuit for use in a semiconductor memory device prevents a tAA from increasing at a read operation due to a delayed command type of signal. The delay selection circuit includes a delay line unit, a power supply voltage detection unit and a path selection unit. The delay line unit has two delay lines for delaying a command type of signal by different delay amounts. The power supply voltage detection unit detects a voltage level of a power supply voltage. The path selection unit selects one of each output of the two delay lines according to an output of the power supply voltage detection unit.
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