Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1994-08-11
1996-09-17
Tran, Toan
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
365201, 365226, 327546, G05F 110
Patent
active
055572324
ABSTRACT:
In a semiconductor integrated circuit device including a step-down circuit for stepping down an external power supply voltage to obtain an internal power supply voltage, the external power supply voltage can be applied to an internal signal processing circuit using a conventional terminal. The semiconductor integrated circuit device has a receiver circuit (1) constituted such that the level of an output signal (S1) of the receiver circuit is set in a binary state in accordance with the level of an inverted write enable signal WE0 of an SRAM, a switch circuit (3) for switching the level of an output signal (VE) to a value equal to a predetermined internal power supply voltage value or an external power supply voltage value (VEE) in response to the level of the output signal (S1) of the receiver circuit, and a driver circuit (4) for generating, from the external power supply voltage (VEE), a voltage value equal to the level of the output signal (VE) from the switch circuit (3) and applying the voltage to the internal signal processing circuit. A reference voltage (V.sub.ref) having a level lower than the "L" level of the signal WE0 during the normal operation of the SRAM is applied to another input terminal of the receiver circuit (1).
REFERENCES:
patent: 4958324 (1990-09-01), Devin
patent: 5283762 (1994-02-01), Fujishima
patent: 5327388 (1994-07-01), Kobayashi
patent: 5337272 (1994-08-01), Suwa et al.
patent: 5347170 (1994-09-01), Hayakawa et al.
patent: 5396113 (1995-03-01), Park et al.
NEC Corporation
Tran Toan
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