| 摘要 |
PURPOSE:To set easily the output voltage at a desired level, by separating an output circuit from an internal logical circuit with an external control signal and applying other external signals to the output circuit. CONSTITUTION:A high level of control voltage is applied to a pad 4 to perform a test of the output circuits 7-1-7-n. In this case, a control line 9 is set at a high level, and a control line 9-1 is set at a low level by an inverter 21. Then the MOSFET20-3 and 20-4 are turned on with 20-1 and 20-2 turned off respectively. Thus a control line 8 is connectd to the input terminal of an output terminal 7-1 via a circuit 30-1. As a result, both the output voltage and output current levels can be tested for the circuits 7-1-7-n based on the control signal applied to a pad 3 not by the output signal of an internal logical circuit 2. |
