Static information storage and retrieval – Powering
Patent
1998-01-30
1999-11-23
Nelms, David
Static information storage and retrieval
Powering
36518906, 36518909, G11C 700
Patent
active
059912219
ABSTRACT:
A microcomputer incorporating a flash memory which is erased and programmed electrically in a stable manner within a relatively wide range of external power supply voltages including those for low-voltage operations. The microcomputer comprises a voltage clamp unit including a reference voltage generating circuit and a constant voltage generating circuit. In operation, the voltage clamp unit generates a voltage of a low dependency on a supply voltage and clamps the generated voltage to a voltage level which, within a tolerable range, is lower than a single supply voltage externally furnished. This prevents voltages boosted by boosting circuits operating on the clamped voltage, i.e., programming and erasure voltages, from being dependent on the externally supplied voltage.
REFERENCES:
patent: 5444664 (1995-08-01), Kuroda et al.
patent: 5537073 (1996-07-01), Arimoto
Ishikawa Eiichi
Matsubara Kiyoshi
Saito Yasuyuki
Sato Masanao
Yada Naoki
Hitachi , Ltd.
Lam David
Nelms David
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