74hc373 follows 74ls373 distinction

LS namely (Low Speed) , HC namely (Highspeed CMOS) understand very easily from the name, former it is low speed chip, chip of high speed CMOS is after, latter can be below taller frequency the job, both be same on the function.
HC373 is 5V, LS373 can accomplish 3V and 5V compatible, when be being used at ordinary times so little distinction, that is to say your sheet piece if machine uses 3.3V, that uses LS, of course a little expensive little.
The distinction of LS and HC
1, LS is low power comsumption Xiaoteji, HC is high speed COMS. The speed of LS compares HC slightly fast. HCT input output and LS are compatible, but power comsumption is low; F is high speed circuit of Xiao Te radical;
2, LS is TTL n, HC is COMS n
3, LS input open a way is tall n, HC input does not allow open a way, hc asks to fluctuation pulls resistor to decide the input carries the n when disabling commonly. LS does not have this requirement however
4, LS outputs next pulling to go up by force pull weak, next pulling is pulled on HC identical.
5, working voltage is different, LS can use 5V only, and HC arrives for 2V commonly 6V;
6, n is different. LS is TTL n, its are low n and tall n are respectively 0.8 with V2.4, and CMOS is 5V time to not be 0.3V and 3.6V in working voltage, CMOS is so OK drive TTL, but be no good conversely
7, drive ability is different, the drive ability of general tall n is LS 5mA, low n is 20mA; And the n of on any account of CMOS all is 5mA;
8, CMOS parts of an apparatus fights electrostatic ability to differ, easy happening bolt locks up a problem, so the input foot of CMOS cannot receive power source directly.