At 08:25 PM 2/17/99 +0000, Andy Stephenson wrote:
>OTP is PROM, which is an EPROM with no window.
>
>The pattern 'blown' into a ROM is done with metalisation layers during the
>final stages of production, which means that you have to commit to a lot of
>parts.

They're cheap, as long as you're <SURE> your code is not going to change.
We went OTP for a while and then mask, and still ended up with a bug in one
product. It was discovered about 8 weeks after we submitted our code for a
12 week process, and had committed to 5000 chips.

Fortunately, it wasn't a huge bug.