Patent ID: 6222781
Filing Date: 2001-04-24
Classification: G11C

Abstract:
A semiconductor integrated circuit device comprising:a control circuit controlling an operation of said semiconductor integrated circuit device following an externally supplied instruction;an internal circuit capable of being in communication by signal with the outside of said internal circuit;an internal power supply circuit receiving an external power supply potential to generate an internal power supply potential to drive said internal circuit in a normal operation mode; anda voltage application circuit controlled by said control circuit to provide an externally supplied potential to said internal circuit instead of said internal power supply potential in a test operation mode,said voltage application circuit including:a terminal receiving said externally supplied potential;a first field effect transistor provided between said terminal and an internal node and set into a turn-on state in said test operation mode;a second field effect transistor provided between said internal node and output of said internal power supply circuit, set into the turn-on state in said test operation mode and set into a turn-off state in said normal operation mode; anda third field effect transistor provided between said terminal and gate of said first field effect transistor, set into the turn-on state in said normal operation mode and set into the turn-off state in said test operation mode.