EPROMs 27256, 2764

[J-vibe]

Hi,

Does anyone know if I could interchange/combine MBM27256-30 and MBM2764-20 ?
Also, can EPROMS of different speeds be used on the same circut? If so, how
can I calc the limits such as mixing in 30s, 20s, etc...

Thanks

 

[Ross Herbert]

Hi,

Does anyone know if I could interchange/combine MBM27256-30 and MBM2764-20 ?
Also, can EPROMS of different speeds be used on the same circut? If so, how
can I calc the limits such as mixing in 30s, 20s, etc...

Thanks

Generally speaking, provided that your CPU bus speed will function
correctly with the lower speed devices - in this case 30nS - then it
will quite happily allow mixing with higher speed chips such as 20nS
devices.

 

[J-vibe]

Generally speaking, provided that your CPU bus speed will function

correctly with the lower speed devices - in this case 30nS - then it
will quite happily allow mixing with higher speed chips such as 20nS
devices.

Thank you.

 

[Watson A.Name - \Watt Sun, the Dark Remover\]

Generally speaking, provided that your CPU bus speed will function
correctly with the lower speed devices - in this case 30nS - then it
will quite happily allow mixing with higher speed chips such as 20nS
devices.

IIRC, a 2764-30 is not 30, but 300 nS.

 

[Ross Herbert]

IIRC, a 2764-30 is not 30, but 300 nS.

Correct. I am used to dealing with modern memory with speeds in the
10's of nanoseconds and I overlooked the fact that the 30 meant 300 on
the 2764. The principle still holds though.

Of course, the OP will need to ensure other specs regarding each
device type (which are being mixed) are also compatible.