Image sensor and operating method thereof

An image sensor, comprising:

• a plurality of clock consumers, each clock consumer of the plurality of clock consumers configured to generate a first clock request signal and receive a first clock signal corresponding to the first clock request signal;
• a block clock management unit configured to
• receive the first clock request signal from each of the plurality of clock consumers,
• generate a second clock request signal corresponding to the first clock request signal, and
• receive a clock response signal and a second clock signal corresponding to the second clock request signal;
• and
• a top clock management unit configured to
• receive the second clock request signal from the block clock management unit,
• generate the clock response signal and the second clock signal corresponding to the second clock request signal, and
• transmit the clock response signal and the second clock signal to the block clock management unit,
• wherein the block clock management unit is configured to
• generate the first clock signal corresponding to the first clock request signal, based on the second clock signal, and
• transmit the first clock signal to each of the plurality of clock consumers, and
• wherein the block clock management unit is configured to
• generate the second clock request signal in response to receiving the first clock request signal from at least one clock consumer among the plurality of clock consumers, and
• stop generating the second clock request signal in response to transmission of the first clock request signal from all of the plurality of clock consumers being stopped.

An operating method of an image sensor, the image sensor including a clock consumer, a block clock management unit, and a top clock management unit, the operating method comprising:

• generating, by the clock consumer, a first clock request signal;
• transmitting, by the clock consumer, the first clock request signal to the block clock management unit;
• generating, by the block clock management unit, a second clock request signal corresponding to the first clock request signal;
• transmitting, by the block clock management unit, the second clock request signal to the top clock management unit;
• generating, by the top clock management unit, a clock response signal and a second clock signal corresponding to the second clock request signal;
• transmitting, by the top clock management unit, the clock response signal and the second clock signal to the block clock management unit;
• transmitting, by the block clock management unit, a first clock signal corresponding to the first clock request signal to the clock consumer, based on the second clock signal;
• and
• stopping, by the block clock management unit, transmission of the first clock signal to the clock consumer in response to transmission of the first clock request signal by the clock consumer being stopped.