
HVT = High V threshold. Can be used in the path where timing is not critical. So by using HVT cells we can save power.
LVT - Low V threshold. One should use these cells in timing critical paths. These cells are fast but , comsumes more power due to its leakage. So it will consume more power. So use only when timing is critical.
SVT- Standard V threshold. Best of both world. Medium delay and medium power requirment. So if timing is not met by small magin with HVT, you should try with SVT. And at last LVT.
RVT- Regular V threshold. Another name for SVT.
SLVT-Super low V threshold.
阈值电压越低,因为饱和电流变小,所以速度性能越高;但是因为漏电流会变大,因此功耗会变差。
速度大小按快到慢依次排列为SLVT, LVT, RVT, HVT。 功耗大小却正好相反。即HVT的cell其阈值电压最大其掺杂浓度越高,其泄露功耗最小;
对于NPN的晶体管是n型半导体,其导电是电子,P衬底多子是空穴,掺杂越高电子越少,越难以导电,阈值电压上升,泄露功耗变少。
对于PNP晶体管是P型半导体,其导电是空穴,N型衬底是电子,掺杂越高空穴越少,越难以导电。
SJ开头这个是厂家的内部命名方式,无法通过SJ开头判断是哪家的芯片,因为哪家都可以这样命名。SJ25-I/SL是MICROCHIP制造的,这是一个来自美国微控制器、记忆体与类比半导体制造商,功能可能是类似单片机或者运放之类的,不过具体资料没有查到。
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