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6,353,780 Bl 3/2002 Hart
6,915,956 B2* 7/2005 Liuetal 235/492
7,110,262 B2* 9/2006 Matsumoto et al 361/737
(Continued) FOREIGN PATENT DOCUMENTS 0 775 964 5/1997
PC Card Standard, Release 7.0, Feb. 1999, PCMCIA, JEIDA, vol. 3, Physical Specification, pp. 5,3. Card Dimensions, 3.1 Write Protect Switch (WPS), Figure 11-3.
Primary Examiner—Hung S Bui
(74) Attorney, Agent, or Firm—Wenderoth, Lind & Ponack, L.L.P.
A semiconductor memory device according to the present invention comprises a housing including a card bus connector for connection to a host device and having a PC card shape having a thickness of 5.0 mm, four SD memory cards housed in the housing and a control circuit for controlling transmission/reception of a signal between the card bus connector and the respective SD memory cards. The semiconductor memory device is suitably used as a recording medium of a host device for which a higher data transfer rate and a larger memory capacity are demanded. Further, a semiconductor memory device, which is attachable and detachable relative to the host device and thereby portable, and relatively inexpensively obtainable, can be provided, and is directly insertable into a laptop personal computer to be used.
12 Claims, 7 Drawing Sheets