Semiconductor integrated circuit with an internal voltage generating circuit requiring a reduced occupied area
First Claim
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1. A semiconductor integrated circuit comprising:
- an internal voltage generating circuit for generating an internal voltage based on an external voltage in response to one of a plurality of periodic signals;
a plurality of detecting circuits respectively corresponding to different predetermined detection levels that are in ascending order of magnitude, each of said detecting circuits being operable to issue a detection signal when said internal voltage issued from said internal voltage generating circuit reaches the corresponding predetermined detection level;
a plurality of periodic signal supply circuits provided correspondingly to said plurality of detecting circuits for issuing said periodic signals having different frequencies, respectively; and
a selecting circuit, in accordance with said detection signals, for selectively supplying said internal voltage generating circuit with a periodic signal of lower frequency from among said periodic signals as said internal voltage approaches a target level.
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Abstract
A semiconductor integrated circuit includes a charge pump for issuing an internal power supply voltage higher than an external power supply voltage, two level detectors for detecting a magnitude of the internal power supply voltage issued from the charge pump, and a composite ring oscillator including two ring oscillators connected to these level detectors and having different oscillation frequencies, respectively. Depending on the magnitude of the internal power supply voltage issued from the charge pump, the signals generated by the ring oscillators are selectively issued to the charge pump.
60 Citations
18 Claims
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1. A semiconductor integrated circuit comprising:
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an internal voltage generating circuit for generating an internal voltage based on an external voltage in response to one of a plurality of periodic signals; a plurality of detecting circuits respectively corresponding to different predetermined detection levels that are in ascending order of magnitude, each of said detecting circuits being operable to issue a detection signal when said internal voltage issued from said internal voltage generating circuit reaches the corresponding predetermined detection level; a plurality of periodic signal supply circuits provided correspondingly to said plurality of detecting circuits for issuing said periodic signals having different frequencies, respectively; and a selecting circuit, in accordance with said detection signals, for selectively supplying said internal voltage generating circuit with a periodic signal of lower frequency from among said periodic signals as said internal voltage approaches a target level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification
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Current AssigneeMitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
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Original AssigneeMitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
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InventorsMitsui, Katsuyoshi
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Primary Examiner(s)Ballato, Josie
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Assistant Examiner(s)TANG, MINH NHUT
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Application NumberUS08/901,244Time in Patent Office865 DaysField of Search324/763, 324/765, 327/536, 327/566, 331/10, 331/57US Class Current327/543CPC Class CodesH02M 3/073 Charge pumps of the Schenke...H03K 5/08 by limiting; by thresholdin...
