Intersil EPROM

[Allison]

Ethan Dicks wrote:
> On Tue, Jun 16, 2009 at 3:42 AM,
> Scanning<steven.alan.canning at verizon.net> wrote:
>   
>> Chuck,
>>
>> You are correct sir. I had forgotten about the dark ages of 4000 Series 10
>> Volt Bulk CMOS. It's all coming back to me now, the night sweats and the
>> flashbacks....  I think I even have a 10 Volt CDP1802 lurking in a drawer
>> somewhere...
>>     
>
> I have one 1802D in a ceramic package.  ISTR it will push to 10V
> (which is required to take it much above 1MHz).
>   

That is in error.   The 1802D early versions ran to 3.2mhz accoring to 
the data sheet
at 5V.  In practice it was more like 3mhz.   I have an elf built back 
when using the 1802D
running at 2mhz which was the commonly used frequency.  It still works!


Allison
>   
>> I've been looking for another 10 Volt CMOS EPROM without any luck. Looks
>> like building a programmer for the parts he has might be the best approach.
>> If we knew the source for the EPROM data we might be able to kludge up a
>> Willem ( sp? ) programmer to program a part....
>>     
>
> You don't have to program a CMOS EPROM at 10V Vcc to use it at 10V
> Vcc.  It's not 10V *only*, it should take any voltage in a wide range
> (the exact min and max Vcc depends on exactly what family the part is
> from, but 3V-15V is common).
>
> Why wouldn't a 27C64 work?  (admittedly, I don't have the data sheet
> in front of me).  You'd have to make a pin swabber for the destination
> machine, but electrically, it's a "C" part, not an "HCT", so I'd
> expect it to work at 10V, but the datasheet will say for sure.
>
> -ethan
>
>