Semiconductor device with protection circuit protecting internal circuit from static electricity
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsIsao Nojiri, Hiroyuki Murai
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Abstract
A protection circuit described herein protects an LCD module from static electricity generated at a first positive power supply terminal in a process of manufacturing the LCD module. The protection circuit includes four diodes connected in series between a first node connected to the first positive power supply terminal and a second node receiving a reference potential, and a diode connected between the second and first nodes. When a first positive power supply voltage (10V) is applied to the first positive power supply terminal, the four diodes do not conduct. Therefore, a current consumption of the LCD module can accurately be measured.
Claims5
A semiconductor device comprising:
- a first input terminal receiving a first positive voltage externally in an inspection of said semiconductor device and a normal operation of said semiconductor device;
- an internal circuit connected to said first input terminal and performing a prescribed operation;
- and
- a first protection circuit protecting said internal circuit from static electricity generated at said first input terminal,
- said first protection circuit including
- a plurality of first diode elements connected in series between said first input terminal and a line of a reference potential and conducting in response to a voltage of said first input terminal exceeding a second positive voltage higher than said first positive voltage, and
- a second diode element connected between the line of said reference potential and said first input terminal.
A semiconductor device comprising:
- an input terminal receiving a first negative voltage externally in an inspection of said semiconductor device and a normal operation of said semiconductor device;
- an internal circuit connected to said input terminal and performing a prescribed operation;
- and
- a protection circuit protecting said internal circuit from static electricity generated at said input terminal,
- said protection circuit including
- a plurality of first diode elements connected in series between a line of a reference potential and said input terminal and conducting in response to a voltage of said input terminal going lower than a second negative voltage lower than said first negative voltage, and
- a second diode element connected between said input terminal and the line of said reference potential.
A semiconductor device comprising:
- an input terminal receiving externally a voltage of at most a first positive voltage and at least a first negative voltage in an inspection of said semiconductor device and a normal operation of said semiconductor device;
- an internal circuit connected to said input terminal and performing a prescribed operation;
- and
- a protection circuit protecting said internal circuit from static electricity generated at said input terminal,
- said protection circuit including
- a plurality of first diode elements connected in series between said input terminal and a line of a reference potential and conducting in response to a voltage of said input terminal exceeding a second positive voltage higher than said first positive voltage, and
- a plurality of second diode elements connected in series between the line of said reference potential and said input terminal and conducting in response to the voltage of said input terminal going lower than a second negative voltage lower than said first negative voltage.
Dependencies are inferred from the claim text.