Sequential (70) latch unlatch

https://chihaukam.blogspot.com/2024/11/if-it-is-policy-of-country-100-of-spies.html?m=1

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

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

2) Cut the power of T2. 

3) Let D1 forward bias.
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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.