Semiconductor integrated circuit device
AssigneeHitachi, Ltd.
InventorsMasashi Horiguchi, Kiyoo Itoh, Yoshiki Kawajiri, Goro Kitsukawa, Takayuki Kawahara, Takesada Akiba
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Abstract
An intermediate voltage generating circuit for generating a voltage lying between an external power supply voltage and a ground voltage, and two voltage limiter circuits for generating internal power supply voltages and stabilized with this intermediate voltage as a reference are provided in a semiconductor integrated circuit. Even if the external power supply voltage or the ground voltage fluctuates, no disagreement is produced between a logical threshold of a circuit operating on the external power supply voltage and a logical threshold of a circuit operating on the internal power supply voltage.
Claims4
A semiconductor integrated circuit device comprising:
- a first terminal to which a first external power supply voltage is applied;
- a second terminal to which with a second external power supply voltage is applied;
- first means for generating an intermediate voltage obtained by dividing said first and second external power supply voltages at a predetermined ratio;
- second means for generating a first internal power supply voltage between said first external power supply voltage and said intermediate voltage;
- and
- third means for generating a second internal power supply voltage between said second external power supply voltage and said intermediate voltage;
- wherein, both said first and second internal power supply voltages are stabilized with said intermediate voltage as a reference.
Dependencies are inferred from the claim text.