Re: Can I use a 27C040 eprom instead of 27C020?

From: Franc Zabkar (fzabkar_at_optussnet.com.au)
Date: 03/26/05 

Date: Sun, 27 Mar 2005 06:27:59 +1000

On Sat, 26 Mar 2005 05:37:21 -0800, mike <spamme0@netscape.net> put
finger to keyboard and composed:

>Mike Harrison wrote:
>> On Sat, 26 Mar 2005 01:05:12 -0800, mike <spamme0@netscape.net> wrote:
>>
>>
>>>Nick wrote:
>>>
>>>>I need to burn some data onto a 27C020 EPROM but can't get my hands on one.
>>>>Can I use a 27C040 instead????
>>>>
>>>>
>>>
>>>Haven't done this since the 2764 days, but you need to make sure you
>>>don't have any floating address lines. If there's an extra address pin,
>>>you can tie it high, low or to the next lowest address pin, depending on
>>>which is easier in your circuit. Program it in the same configuration.
>>
>>
>> Remember to duplicate the data over the two halves of the chip,
>>
>
>Why?
>mike

Because then it won't matter whether the extra address pin is
hardwired high or low in your circuit. The OP's job may be a repair of
an existing design, not necessarily a new design of his own.

- Franc Zabkar 

-- 
Please remove one 's' from my address when replying by email.

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