Semiconductor device and inkjet printing element substrate

A semiconductor device comprising:

• a one-time programmable (OTP) element, an electrical property of which changes with application of a voltage equal to or higher than a predetermined voltage to the OTP element;
• a write control switch, connected in series between the OTP element and ground, that switches between a conductive state and a non-conductive state based on a first write control signal for controlling a write to the OTP;
• a voltage generation circuit that outputs a write voltage from an output terminal of the voltage generation circuit based on a power source and a second write control signal for controlling a write to the OTP, the electrical property of the OTP being changed due to the application of the voltage equal to or higher than the predetermined voltage to the OTP when the write voltage is output from the output terminal of the voltage generation circuit and the write control switch is in the conductive state;
• wiring that electrically connects the output terminal of the voltage generation circuit to the OTP element, for use to apply the voltage equal to or higher than the predetermined voltage to the OTP;
• a noise detection circuit that is electrically connected to the power source and detects noise at the power source;
• and
• a noise discharge switch having a first connection terminal electrically connected to the wiring at an intermediate node located between the output terminal of the voltage generation circuit and the OTP element and having a second connection terminal electrically connected to a discharge path, and which receives an output of the noise detection circuit as a control input, wherein the noise discharge switch enables noise current to be discharged from the wiring in an event where the noise detection circuit detects noise at the power source,
• wherein
• the noise detection circuit includes a pulse width expansion circuit that expands a pulse width of noise, and
• the noise discharge switch enables noise current to be discharged from the wiring by recognizing a period in which the pulse width is being expanded by the pulse width expansion circuit as a period in which the noise detection circuit is detecting noise.

An inkjet printing element substrate comprising:

• a one-time programmable (OTP) element, an electrical property of which changes with application of a voltage equal to or higher than a predetermined voltage to the OTP element;
• a write control switch, connected in series between the OTP element and ground, that switches between a conductive state and a non-conductive state based on a first write control signal for controlling a write to the OTP element;
• a voltage generation circuit that outputs a write voltage from an output terminal of the voltage generation circuit based on a power source and a second write control signal for controlling a write to the OTP element, the electrical property of the OTP element being changed due to the application of the voltage equal to or higher than the predetermined voltage to the property-variable OTP element when the write voltage is output from the output terminal of the voltage generation circuit and the write control switch is in the conductive state;
• wiring that electrically connects the output terminal of the voltage generation circuit to the OTP element, for use to apply the voltage equal to or higher than the predetermined voltage to the OTP element;
• a noise detection circuit that is electrically connected to the power source and detects noise at the power source;
• a noise discharge switch having a first connection terminal electrically connected to the wiring at an intermediate node located between the output terminal of the voltage generation circuit and the OTP element and having a second connection terminal electrically connected to a discharge path, and which receives an output of the noise detection circuit as a control input, wherein the noise discharge switch enables noise current to be discharged from the wiring in an event where the noise detection circuit detects noise at the power source, and
• the noise detection circuit includes a high-pass filter that blocks a direct current voltage from the power source and transmits noise.