| 摘要 |
A power-up control circuit has three components including a normal power-supply voltage level detection section, a special command section for detecting a deep-sleep enable input signal, and an output driver section that logically combines the output signal of the normal power-supply voltage level detection section and the special command detecting section to provide an improved, combined power-up control signal CPWRUP. The combined power-up control signal CPWRUP signal is temporarily brought to a LOW state for a predetermined period of time immediately after the end of a power-saving mode of operation, such as a deep-sleep mode of operation for a memory device. The LOW state of the combined power-up control signal CPWRUP output signal allows all internal circuitry to be returned to their initial states that are the same as those obtained after a normal power-up sequence, even though the external voltage level stays at its normal level.
|
