Memory card with low power consumption in inactive state

摘要

A memory card including an integrated memory circuit and internal power supply wherein a power supply voltage to the memory circuit is supplied from the internal power supply when the memory card is not mounted in a data processing device and from the data processing device when the memory card is mounted therein and further includes an operating signal detection circuit for determining whether the memory card is active or inactive in a mounted state and a power supply control circuit for dropping the power supply voltage applied to the memory circuit by a predetermined amount when the memory card is inactive.