Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1992-11-20
1995-09-19
Cunningham, Terry D.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327306, 327309, 327538, 327546, 327 80, G05F 110
Patent
active
054518962
ABSTRACT:
A semiconductor integrated circuit device includes an aging mode control circuit, which detects the times of toggle of an external supply voltage (external Vcc) with a predetermined amplitude and generates an aging mode enable signal, and an internal voltage reduction circuit transmitting a voltage, which changes in accordance with change of the external supply voltage (external Vcc), onto an internal supply line in response to the aging mode enable signal. The semiconductor integrated circuit device enters an aging mode only when the external supply voltage oscillates a predetermined number of times with an amplitude not less than the predetermined amplitude. The semiconductor integrated circuit device does not unnecessarily enter the aging mode for an aging test, and facilely and surely enters the aging mode without utilizing a special timing relationship of external control signals.
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Cunningham Terry D.
Mitsubishi Denki & Kabushiki Kaisha
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