Morrison & Foerster LLP
Semiconductor integrated circuit
A semiconductor integrated circuit having a low maximum allowable operating frequency such as an analog circuit can be prevented from being destroyed during a scan test. When a scan test mode signal is “1”, output signals of a first AND circuit and a second AND circuit are fixed to a low level and an output of an OR circuit is fixed to a high level. Therefore, output signals of fourth through sixth flip-flops FF4-FF6 are not transferred to first through third analog circuits during the scan test. On the other hand, the output signals of the fourth through sixth flip-flops FF4-FF6 are transferred to the first through third analog circuits during a normal operation.
Sanyo Electric Co., Ltd. Sanyo Semiconductor Co., Ltd.
G G
G01R G01R
inventional inventional
Takako Hideo
Nishiyama Ito