Electrostatic protection circuit
A circuit device includes: a first terminal; a second terminal; a first thyristor circuit whose one end is coupled to the first terminal; a second thyristor circuit whose one end is coupled to the second terminal; and a voltage setting circuit that is shared by the first thyristor circuit and the second thyristor circuit and through which a current from the first thyristor circuit when the first thyristor circuit is turned on and a current from the second thyristor circuit when the second thyristor circuit is turned on flow. The voltage setting circuit sets a voltage at other end of the first thyristor circuit to a first voltage when the first thyristor circuit is turned on, and sets a voltage at other end of the second thyristor circuit to a second voltage when the second thyristor circuit is turned on.
1 . A circuit device comprising:
a first terminal;
a second terminal;
a first thyristor circuit whose one end is coupled to the first terminal;
a second thyristor circuit whose one end is coupled to the second terminal; and
a voltage setting circuit that is shared by the first thyristor circuit and the second thyristor circuit and through which a current from the first thyristor circuit when the first thyristor circuit is turned on and a current from the second thyristor circuit when the second thyristor circuit is turned on flow, wherein
the voltage setting circuit sets a voltage at an other end of the first thyristor circuit to a first voltage when the first thyristor circuit is turned on, and sets a voltage at an other end of the second thyristor circuit to a second voltage when the second thyristor circuit is turned on,
wherein the voltage setting circuit is directly coupled to a trigger circuit coupled to a gate of the first thyristor circuit and a trigger circuit coupled to a gate of the second thyristor circuit,
the voltage setting circuit includes a first voltage clamping element to an n-th voltage clamping element coupled in series, wherein n is an integer of 2 or more,
an anode of the first voltage clamping element is coupled to a high potential-side power supply node.
2 . The circuit device according to claim 1 , wherein the first voltage and the second voltage are the same voltage.
3 . The circuit device according to claim 1 , wherein
the first voltage and the second voltage are different voltages.
4 . The circuit device according to claim 1 , wherein
the other end of the first thyristor circuit and the other end of the second thyristor circuit are coupled to the anode of the first voltage clamping element.
5 . The circuit device according to claim 4 , wherein
a cathode of the n-th voltage clamping element is coupled to a low potential-side power supply node.
6 . The circuit device according to claim 1 , wherein
the other end of the first thyristor circuit is coupled to an anode of an i-th voltage clamping element, the other end of the second thyristor circuit is coupled to an anode of a j-th voltage clamping element, i and j being integers satisfying 1≤i<j≤n.
7 . The circuit device according to claim 1 , wherein
the other end of the first thyristor circuit and the other end of the second thyristor circuit are coupled to a cathode of the n-th voltage clamping element.
8 . The circuit device according to claim 1 , wherein
at least one of the first voltage clamping element to the n-th voltage clamping element is a diode.
9 . The circuit device according to claim 1 , wherein
at least one of the first voltage clamping element to the n-th voltage clamping element is a PMOS transistor in which a source and a gate are coupled.
10 . The circuit device according to claim 1 , wherein
at least one of the first voltage clamping element to the n-th voltage clamping element is a pnp bipolar transistor in which a base and an emitter are coupled.
11 . The circuit device according to claim 1 , further comprising:
an electrostatic protection circuit between power supplies that is provided between a high potential-side power supply node and a low potential-side power supply node and that includes a third thyristor circuit, wherein
the voltage setting circuit is a voltage setting circuit that is provided in the electrostatic protection circuit and that is coupled to the third thyristor circuit.
12 . The circuit device according to claim 1 , wherein
a gate of the first thyristor circuit and a gate of the second thyristor circuit are coupled to a power supply terminal.
13 . The circuit device according to claim 1 , wherein
V max1 <V 1 +Vh ( TH ),
V max2 <V 2 +Vh ( TH ),
wherein a hold voltage of a thyristor TH of each of the first thyristor circuit and the second thyristor circuit is set to Vh(TH), the first voltage is set to V 1 , the second voltage is set to V 2 , a maximum operating voltage of the first terminal is set to Vmax 1 , and a maximum operating voltage of the second terminal is set to Vmax 2 .
14 . A circuit device comprising:
a first terminal;
a second terminal;
a first thyristor circuit whose one end is coupled to the first terminal;
a second thyristor circuit whose one end is coupled to the second terminal; and
a voltage setting circuit that is shared by the first thyristor circuit and the second thyristor circuit and through which a current from the first thyristor circuit when the first thyristor circuit is turned on and a current from the second thyristor circuit when the second thyristor circuit is turned on flow, wherein
the voltage setting circuit sets a voltage at an other end of the first thyristor circuit to a first voltage when the first thyristor circuit is turned on, and sets a voltage at an other end of the second thyristor circuit to a second voltage when the second thyristor circuit is turned on,
the voltage setting circuit includes a first voltage clamping element to an n-th voltage clamping element coupled in series, n being an integer of 2 or more,
the other end of the first thyristor circuit and the other end of the second thyristor circuit are coupled to a cathode of the n-th voltage clamping element, and
an anode of the first voltage clamping element is coupled to a high potential-side power supply node.
15 . A circuit device comprising:
a first terminal;
a second terminal;
a first thyristor circuit whose one end is coupled to the first terminal;
a second thyristor circuit whose one end is coupled to the second terminal; and
a voltage setting circuit that is shared by the first thyristor circuit and the second thyristor circuit and through which a current from the first thyristor circuit when the first thyristor circuit is turned on and a current from the second thyristor circuit when the second thyristor circuit is turned on flow, wherein
the voltage setting circuit sets a voltage at an other end of the first thyristor circuit to a first voltage when the first thyristor circuit is turned on, and sets a voltage at an other end of the second thyristor circuit to a second voltage when the second thyristor circuit is turned on, and
the voltage setting circuit is disposed between the first thyristor circuit and the second thyristor circuit in a plan view in a direction orthogonal to a substrate of the circuit device.