Power-up signal generator for use in semiconductor device
AssigneeHynix Semiconductor Inc.
InventorSang-Jin Byeon
Life of this patent
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Abstract
In an apparatus for generating a power-up signal, a mode register set (MRS) and other circuits are prevented from being reset, thereby providing stable circuit operation. A final power-up signal is not disabled even though an internal voltage generating unit is turned off at a test mode. The apparatus includes a power-up signal generator for producing a power-up signal; a multiplexing unit for selectively outputting the power-up signal or a static voltage signal in a test mode; and a power-up signal generator for producing a final power-up signal in response to the power-up signal of the power-up signal generator and an output signal of the multiplexing unit as the final power-up signal.
Claims5
An apparatus for generating a power-up signal comprising:
- a plurality of individual power-up signal generation means for detecting voltage levels which are applied to a plurality of voltage terminals and for producing individual power-up signals corresponding to the voltage levels of the voltage terminals, respectively;
- a multiplexing means for selectively outputting the individual power-up signals corresponding to internal voltage terminals or an alternate signal in response to a test mode internal power off signal to disable an internal power at a test mode, wherein the individual power-up signals and the alternate signal produced by the multiplexing means have a constant voltage level;
- and
- a final power-up signal generating unit for producing a final power-up signal in response to output signals of the individual power-up signal generation means and the multiplexing means.
3-9. (canceled)
An apparatus for generating a power-up signal comprising:
- a power-up signal generating means for producing a power-up signal;
- a multiplexing means for selectively outputting the power-up signal or a static voltage signal in a test mode;
- and
- a power-up signal generating means for producing a final power-up signal in response to the power-up signal of the power-up signal generating means and an output signal of the multiplexing unit and as the final power-up signal.
Dependencies are inferred from the claim text.