Title:
SEMICONDUCTOR DEVICE
Document Type and Number:
Japanese Patent JP3819002
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a semiconductor device whose circuit operation is difficult to analyze.
SOLUTION: When load current made to flow through a load circuit connected to an output node NO exceeds the supply capability of a constant current circuit 40, insufficient load current is supplied from a PMOS 31 connected in parallel with the constant current circuit 40. Meanwhile, when the load current is not higher than the supply current of the constant current circuit 40, excessive current is made to flow to the ground potential GND through an NMOS 32. By setting the supply capability of the constant current circuit 40 to an appropriate value below the maximum load current, a small increase in power consumption can suppress the fluctuations of current supplied from a power supply voltage VDD. This can make it difficult to analyze the operation of the load circuit by monitoring a current signal waveform.
Inventors:
▲高▼林 康隆
Application Number:
JP2004000583A
Publication Date:
September 06, 2006
Filing Date:
January 05, 2004
Export Citation:
Assignee:
Oki Electric Industry Co., Ltd.
International Classes:
G05F1/56; (IPC1-7): G05F1/56
Domestic Patent References:
| JP2000348152A | ||||
| JP2000066742A | ||||
| JP3082363A | ||||
| JP60126811U | ||||
| JP57003116A |
Foreign References:
| EP1107502A2 | ||||
| US6172494 | ||||
| US6201375 |
Attorney, Agent or Firm:
Kakimoto Yasunari
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