| 摘要 |
PURPOSE:To confirm that an integrated circuit operates normally at least up to a detection level, by suppressing the output of a reset signal out of a source voltage detecting circuit by an external set signal arriving at a terminal of the integrated circuit. CONSTITUTION:When an L-level signal is supplied to the test mode signal terminal 9 provided to the integrated circuit 1, the integrated circuit 1 suppress the output of the source voltage detecting circuit (g) in test mode by AND logic 7. On the other hand, an H-level signal is supplied to the test mode signal terminal 9 in a normal operation state and a test state for resetting, so the output of the source voltage detecting circuit part 8 is supplied to an operation function part 2 through the AND logic 7. For this purpose, a source voltage VCC is set to, for example, 4.0V lower than 4.2V as the detection level VT in test mode, confirming whether the integrated circuit 1 operates normally or not. |
