Re: PLA replacement

From: Gerrit Heitsch <>
Date: Tue, 27 Nov 2012 19:22:40 +0100
Message-ID: <>
On 11/26/2012 10:09 PM, wrote:
> On 2012-10-09, at 17:16, Gerrit Heitsch wrote:
>> You can [...] tie _CS and _OE of a 27C512 to GND and use it, properly programmed, as a PLA replacement.
> I recall seeing something like that advertised (by Jens AFAIR) some time ago.. Which yields the question if there is a payload for such EPROM available somewhere already?

This URL should contain all you need:

An EPROM PLA can work, with the right EPROM (which is not necessarily 
the fastest you can get), but most of them fail with modules like EasyFlash.

As for the timing... grab the datasheet for the 82S100 or the Fairchild 
93459PC from the net. That's the original bipolar PLA. Its spec is 45ns, 
the fastest EPROM I have ever seen was a 27C256-55, but as I said, speed 
isn't everything.

So far I have enough real PLAs that I didn't have to resort to using an 


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Received on 2012-11-27 19:00:06

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