Trangga:

There is one type of RAM that has address latching. That is the dynamic type called DRAM that, in its various types, has a RAS_N (Row Adderess Strobe) and CAS_N (Column Address Strobe). These could, with extreme design care, off load the function of the typical 8051 '373 or '573 type latch to within the memory chip. However I would venture to guess that the amount of critical logic to implement a high speed DRAM interface may very well exceed the simplistic and cheap logic of a single 74HC373 latch!!

As far as other types of SRAMs or EPROMs or FLASHs you would find that if there were some type with an internal address latch it would be a specialty non-mainstream type of component. As such it is likely to cost much more than the common commodity type memory part plus the bog standard 8-bit latch.

These days there is another choice that would eliminate the need for any external latch at all. There are numerous SiLabs C8051Fxxx parts that have large amounts of onboard FLASH for code that completely eliminates any need for external code store. These parts often also have plenty of onboard XRAM that can eliminate any need for an external RAM component. If you have need for a quite large external RAM then certain SiLabs parts offer an external memory interface that can be operated in a fully non-multiplexed manner to address SRAM directly without any external latches.

Michael Karas