Overclocking memory chips: will it work?

[technix]

For an ATmega162 running at 16MHz, the bus operates at 62.5ns time scale. Can I use a 70ns memory chip on it, essentially slightly overclocking it? Will it result in reliability issues?

[bktemp]

The AVR datasheet specifies "Read Low to Data Valid": 1.0tcl-50ns. At 16MHz this is only 12.5ns.
Compare this value with the "Output Enable to Output Valid" time in the SRAM datasheet. Most 55-80ns SRAMs will have a value of 25-50ns. Therefore it can work, but you may have reliability issues.
You should also use 74AC573 latches instead of 74HC573 for a better address setup time.
But AVRs can insert wait states: When using 1 wait state, the timing is fine for 70ns SRAMs.

[Someone]

Also the external memory interface has programmable wait states, so you can use a slower memory and have the processor stall while its waiting for the bus transaction.