Unfortunately the only way around it is to use 74373's to control each latch enable. I have done this before and it is a little bit of a challenge - but that is the best way to learn!aliw wrote:Ok but for the 96 led's I will need to use 74373's for the enables that gives me a headakebecause it's a little messy. so is there a way to make this simpler? (that I don't need to use 74373's for the enables?) Hope there is
and I know that when you type in the part number in google the whole datasheet will come up. But what I ment was that the numers itself tell you something for example 18F4420. that the 18F means that there are 18 output pins and 4420 is the ram of it or something.(I know that wat I just wrote here is completely not true but it is just to make the question more understandable.)
The numbers really have no special significance in that they don't tell you anything about the features of the chip or memory capacity etc...
However, the 74 prefix (in regards to the 74373) tells us that it belongs to the TTL family of chips (which means this chip has been made using transistors, resistors and diodes). The 373 at the end is just to set it apart from all other 74 series chips.
It's a little bit like a laptop for instance. You can get a 17" apple laptop or a 15" apple laptop or even a 13" apple laptop. In all of these cases the prexif is the same (I.E. they are all part of the apple family) but then the model number is different because the laptops are all different.
Like wise, you can get a whole heap of different 74 series chips, and then the numbers after them just set it apart from the rest. We can then look up google or a databook to understand what it is that that particular part number does.
It is very similar with say an 18f4550 microcontroller. 18f tells us that it belongs to the 18f family of pic microcontrollers, then the 4550 is a unique part number that we can then look up to find out everything there is to know about that chip.
take a look at this picture
