Generally, 74LS373 Latch IC is used for latching the address issued by Microprocessor.
It has 8-latches(D-flip flop).

Address will
 appear on AD0-AD7 lines.
ALE will go high and forcing enable G pin of Latch. This will make the latch transparent. It means whatever will be input, will be output. Presently input address is A0-A7.Therefore output is A0-A7.
When ALE=0, then AD0-AD7 will now be used as data bus.

{ 1 comments... read them below or add one }

  1. Great and simple explanation! This helped me a lot in understanding the interface of microprocessors, and just a few lines. Incredible..



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