Question about programming EPROM and its specifications

[Lord Loh.]

EPROM Help...

I hope this is the right forum to ask this sort of a question....

I would read a particular term in the datasheet of 27256 EPROM...
It said, 168±8 burn-in (125°c)hr what does this mean ?

Also, I would like to know if an EPROM requires UV light during the programming or only during erase operations.

Is there a limit on the number of times an EPROM may be programmed ?


And last, Can an EPROM be programmed on a bread board ? by constantly changing connections, and giving the final puse of Vcc/Vpp and chip select ?

Thanks in advance...

 

[sefton]

Re: EPROM Help...

The eprom requires uv light for erase only.
There is a limit to the number of erases.
The answer to the last question is yes if you know what you are doing.

 

[Colbhaidh]

Re: EPROM Help...

168 hour burn in at 125 deg C is a typical reliability test for IC's. For the EEPROM case, it will be stressed at 125C for 168, 500, 1000 hours and tested to make sure the Erase and program Vt's for the EPROM cells does not change.
You do not need to bother with this detail.