Patent ID: 9030245
Filing Date: 2015-05-12
Classification: G06F,H01L,H03K

Abstract:
1. A semiconductor device comprising: a measurement circuit measuring propagation time of an internal clock signal inside the semiconductor device; a delay adjustment circuit adjusting the propagation time of the internal clock signal; and a data output circuit outputting a data signal in response to the internal clock signal, wherein the measurement circuit includes a replica circuit of a propagation path of the internal clock signal, the measurement circuit measuring the propagation time of the internal clock signal by measuring a time from when a test signal that is different from the internal clock signal is supplied to the replica circuit until when the test signal is output from the replica circuit, and wherein the measurement circuit further includes a latch circuit that latches the test signal output from the replica circuit at a time when the test signal supplied to the replica circuit is changed from a second logic level to a first logic level after the test signal output from the replica circuit is changed from the first logic level to the second look level.