Abstract: An interface circuit connected between the functional unit and the output/input bus in a multi-chip system is disclosed. One characteristic of the present invention is that the positive voltage protecting diode located between the independent power of the functional unit and the output/input bus in the functional circuit is not required. Therefore, the signal on the output/input bus will not be distorted due to the low resistance load caused by shutting down the independent power of the functional unit. Another characteristic of the present invention is that the negative voltage protecting diode located between the output/input bus and the grounding in the functional circuit is changed to a stable voltage Zener diode. Therefore, the high voltage static electricity is guided into the grounding via the Zener diode so that the goals of anti-static electricity and protecting the functional unit are achieved.

Abstract: A slim card reader is disclosed. One end of a shell body has a plugging slot plugged with a memory card, and there are metal connection pins that contact the memory card. The characteristic is the second end of the shell body corresponds to a female plugging slot of the USB port, and on the surface of the end of the shell body corresponding to the female plugging slot, there are a plurality of metal flakes that contact the conducting flakes in the female plugging slot. The key point, which makes a breakthrough in the dimensions of the card reader, is that the present invention doesn't use a conventional USB plugging head design. The metal external mask of the USB plugging head is removed. The limitation caused by the large dimensions of the USB plugging head produced by the format of the metal external mask is overcome.

Abstract: A multi-slave interface card reader includes a card reader body having a USB signal interface plug and a 3C memory card interface receptacle installed on one side of the body being vertical to the USB signal interface plug for placing a memory card, e.g. Mini-SD, RS-MMC, Micro-SD, or Micro-MMC. Since the card reader body has the memory card installed therein, it is possible to place the card reader body in devices like cameras, MP3's, mobile phones . . . and so forth, to act as a memory. The USB signal interface plug can be directly connected to a computer host, or the card reader body can be connected to another card reader for transferring the data stored in the memory card to the computer through the card reader. Such a device of single body with multiple interfaces allows users to employ across various platforms, meanwhile also provides cost down benefits for manufacturers.

Abstract: A memory card module includes a first circuit board, and a second circuit board. On one surface of the first circuit board, there are flash memories and a controller. The second circuit board is installed at one end of the first circuit board and is electrically connected with the first circuit board so as to form a transmitting interface port. On a first surface of the second circuit board, there are a plurality of interface connecting points. On a second surface of the second circuit board, part of the second surface is hollowed out. A space formed between the hollowed out area and the corresponding first circuit board increases the area for circuit layouts and the mounting components for the first circuit board. Therefore, quantity of accommodated memory components may be increased so as to increase the total storage capacity of the memory card under limitation of small dimensions.

Abstract: A memory card with test contacts having protection on an interface is provided. The claimed memory card comprises a card body having a circuit board therein, a control chip on the circuit board used to control data reading and writing of the memory card, a memory chip on the circuit board used to store data for the memory card, a memory card interface electrically connecting to the control chip, a connection interface, electrically connecting control chip, and a lid or a tab on the memory card interface or on the connection interface to protect test contacts on the interfaces.