Kai Klaas wrote:
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1. 'Fast' SRAM introduces a much higher supply current.

Isn't that only when they work fast? If you use a fast SRAM chip in a "slow" circuit will it actually consume more power?

3. 'Fast' SRAM are very fast and need special care in terms of decoupling and signal routing. PCB designs, which neglect solid ground plane, can highly suffer from ground bounce, etc.

I have used cache chips (20ns) as RAM in 8051 applications without problems. Perhaps I have just been lucky?

Best regards,

Mikkel C. Simonsen