Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
IC MEMORY CARD
Document Type and Number:
Japanese Patent JPH01244591
Kind Code:
A
Abstract:

PURPOSE: To extend the service life of a built-in battery of a power source built-in IC memory card and to simplify its structure by providing a power source control circuit to start the power source supplying from a power source to a memory control circuit by means of an external data input.

CONSTITUTION: In a main body, a semiconductor memory 102, a memory control circuit 104 to input/output data and to control the memory data, and a power source control circuit 101 to make a power source 103 for the memory control circuit to be built-in, and to start the power source supplying from the power source 103 to the control circuit 104 by a data input/output signal between the outside are possessed. Consequently, at the time of the data input/output, since the power source is supplied from the power source to the control circuit, the data can be inputted/outputted in the same way as the normal IC memory card, whereas, in the other case, the power is not supplied from the power source to the memory control circuit. Thus, the useless consumption of the power source can be prevented when the data are not inputted/outputted. Further, since a power source switch, a terminal, etc., are unnecessary, the costs can be lowered, and the constitution can be simplified.


Inventors:
OTANI AKIO
KUROSE KOICHI
Application Number:
JP7267088A
Publication Date:
September 28, 1989
Filing Date:
March 26, 1988
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
SEIKO EPSON CORP
International Classes:
B42D15/02; B42D25/305; G06F1/00; G06F1/26; G06F1/32; G06K19/00; G06K19/07; (IPC1-7): B42D15/02; G06F1/00; G06K19/00
Domestic Patent References:
JPS61105795A1986-05-23
Attorney, Agent or Firm:
Kisaburo Suzuki (1 outside)