Memory card, host device, memory card connector, and memory card adapter

A memory card comprising:

• a first surface including first to Nth rows, where N is an integer of two or greater, each of first to Nth rows being an area where three or more terminals are arranged in a linear fashion;
• a second surface facing the opposite side from the first surface;
• and
• 1st to Nth terminal groups placed in the first to Nth rows,
• wherein the 1st terminal group includes terminals to which differential clock signals are assigned, terminals to which single-ended signals are assigned, and a terminal to which a first power supply voltage is assigned, and
• wherein Kth terminal group, where K is an integer no smaller than two and no greater than N, includes terminals to which differential data signals are assigned.

A host device comprising:

• a connector connectable to a memory card;
• a physical layer interface that transmits a first differential data signal to the connector via a first transmission path and receives a second differential data signal from the connector via a second transmission path;
• a first capacitor provided to isolate DC current of the first transmission path;
• and
• a second capacitor provided to isolate DC current of the second transmission path.

A memory card connector to which a memory card can be attached and to be provided in a host device, the memory card connector comprising:

• 1st terminals to which the memory card is connectable;
• 2nd terminals to be connected to a physical layer interface of the host device;
• and
• a coupling capacitor electrically inserted between some of the 1st terminals and the 2nd terminals.