Fuse block unit and fuse block system and memory device

A fuse block unit, comprising:

• a first laser fuse, outputting first data;
• a first laser latch, coupled to the first laser fuse;
• a second laser fuse, outputting second data;
• a second laser latch, coupled to the second laser fuse;
• and
• a share flip-flop, comprising:
• a first switch element, selectively coupling the first laser latch to a first node according to a first load voltage;
• a second switch element, selectively coupling the second laser latch to the first node according to a second load voltage, wherein high logic pulses of the second load voltage do not occur simultaneously with those of the first load voltage;
• a third switch element, selectively coupling an input node to the first node according to an inverted shift voltage;
• a first latch, coupled between the first node and a second node;
• a fourth switch element, selectively coupling the second node to a third node according to a shift voltage;
• and
• a second latch, coupled between the third node and an output node.