Row drivers, image sensors, and image processing systems including the same

An image processing system comprising:

• a first chip comprising an external voltage generator configured to generate an external voltage and a first pad configured to output the external voltage;
• a second pad configured to receive the external voltage;
• a pixel array in which a plurality of pixels are arranged;
• a second chip comprising a voltage generator configured to generate an internal voltage;
• and
• a row driver configured to generate control signals that control the plurality of pixels, the row driver configured to use the external voltage and the internal voltage,
• wherein the external voltage comprises a first external voltage and a second external voltage, the internal voltage comprises a first internal voltage and a second internal voltage, a level of the first internal voltage is higher than a level of the second internal voltage, and a level of the first external voltage is between the level of the first internal voltage and the level of the second internal voltage, and
• wherein the row driver comprises:
• a pull-up transistor configured to receive the first internal voltage;
• a first transistor connected to one end of the pull-up transistor and connected to a first node;
• a second transistor connected to the first node;
• and
• a pull-down transistor configured to receive the second internal voltage and connected to one end of the second transistor;
• a third transistor connected to the first node;
• and
• a fourth transistor configured to receive the first external voltage and connected to one end of the third transistor.

A row driver comprising:

• a first transistor that is configured to receive a first internal voltage and is connected to a first node;
• a second transistor that is connected to the first node and is configured to receive a second internal voltage;
• and
• a third transistor that is connected to the first node and is configured to receive an external voltage generated by a source that is different from a source of the first internal voltage and the second internal voltage,
• wherein a level of the first internal voltage is higher than a level of the second internal voltage, and a level of the external voltage is between the level of the first internal voltage and the level of the second internal voltage.