sequential (70) latch unlatched

 https://wodewangzhishime.blogspot.com/2023/02/httpswodewangzhishime.html

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Ref: https://wodewangzhishime.blogspot.com/2021/12/httpswodewangzhishime_28.html?m=1 

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Me: The above picture is a transistor-latch . . This latch is formed by one PNP transistor and one NPN transistor.

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T1,2 stand for transistor 1, 2.

John: When we give a positive voltage to the gate of T1, T1 will be conducted forever. . We call that a latch.

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Me: How can we let a latch unlatch ??

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VSS stand for source of power.

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1) Give a negative voltage to the gate of T1

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2) Cut the VCC. . That mean , cut the source of power.
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John: A latch is to temporarily latch the data in the memory, when the latch unlatch, the memory will lose forever.