When to use Buffers for devices connected to Address and Data Bus

I am working with 80c196kc; I have connect 7 to 8 chips to the address and
data bus of the microcontroller, including two RAMS(AS7c256) and 6
latches(74hc373).

Question is, should i be using a buffer(74hc245).

Moreover as a rule of thumb how many chips can be safely connected to a
buffer/tranceiver.

I have tried using datasheets; the datasheet of latch(74hc373 ) shows a
max input current of 20ma and upto 10uA of input leakage current. Whereas
the output current of buffer(74hc245) is 20mA. Now i know i cant use the
max input current of latch but can i use the leakage current. I am
preplexed. Therefore a rule of thumb will be more than welcome.
.

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