US 2003/0142432 A1Published application

Storage media reading system and semiconductor integrated circuit device

AssigneeHitachi, Ltd.

InventorsHiroyasu Yoshizawa, Yoichiro Kobayashi

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Abstract

There is provided a semiconductor integrated circuit for magnetic recording including a write circuit which may be operated with the power supply voltage of 5V system without any problem on the dielectric strength thereof and also assures high speed data write operation to media of the magnetic recording system and a high-speed and highly reliable storage media reading system which has employed the same semiconductor integrated circuit. The write circuit described above is configured to apply a drive voltage to a head through superimposition so that a write current generates over-shoot when the current is inverted by providing the write head with a voltage and moreover a protection element is provided to protect a switch MOSFET for the current switching from a high voltage which is applied to the write head when the current is inverted.

Claims10

Dependent claims

A semiconductor integrated circuit comprising:

a first drive circuit for making a steady current flow by driving a magnetic head with a voltage;
a second drive circuit for temporarily making a write current flow when a current is inverted;
and a write circuit for generating a drive voltage and then applying to the head to generate over-shoot of the write current when the current is inverted by superimposing the current flowing into the head by a couple of drive circuits, wherein said first and second drive circuits are driven with the identical power supply voltage, and wherein said write circuit is provided with a switch field effect transistor for switching the flowing direction of the current flowing into the head and a protection element for preventing a voltage higher than the dielectric strength from being applied to the switch field effect transistor by a high voltage applied to the write head when the current is inverted.

Dependencies are inferred from the claim text.