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You can connect, say, 4 (each has 8 latches) of them to 8-bit port and latch outputs using one control input: LE (latch enable) .. see drawing below ..
You can connect all D0s from 4(or more) 74373 in parallel to, say, P1.0 .. all D1s to P1.2 .. all D7s to P1.7 ..
Then you need to control the /LE pins; you can hook them up to 4 separate microcontorller pins, say, P2.0, P2.1, P2.3 and P2.4 ..
To output data on the 74373(1) set required data on PORT1 and make H-L-H transistion on P2.0 to latch the data in 74373(1) ..
If you make similar transiston on P2.1 you will latch data to 74373(2) .. and so on ..
Of course, the /OE pins of all 74373 have to be connected to 0V to enable outputs ..
If we want to do it as Input way. So we just in reverse connect. The 74573(1) Q1, 74573(2) Q1, 74573(3) Q1 connect in paraller.... 74573(1) Q2, 74573(2) Q2,..connect in paraller way and so on then the D1-D7 as our input. Am i right?
As inputs I wouldn't use 373 latches but 74LS245 (or similar) tri-state buffers ..
The concept is the same: all outputs connected together and only one 245 is active at a time ..
Ya, you are right. we can not use 373 because so many input coming in at the same time and how can we LE the 373!! If using 245 we can do isolation between input and output. But can the 245 Latch the signal?
I think to extant the Output i think using 373, to extant the Input using 245! because the 245 don't have latch function as 373, am i right?
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