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My one way conversations with Hitachi 2532 Eproms

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Hi everyone, I'm new here. I've got a situation where I can burn TMS2532JL eproms but not the HN462532G Hitachi counterparts. I'm using a Willem GQ-4X programmer and the write process appears to succeed but the chip is blank afterwords. I've tried it with and without an external power supply on the programmer and I've also re-erased the Eproms for 15-20 minutes, same deal. I was wondering if you all could offer some suggestions before I give up. I read that someone had success writing at a slightly higher voltage but my programmer doesn't seem to have that ability. Is the VPP just a constant voltage that I could make an adapter board to provide my own external VPP instead of using the programmer's? None of this is anything super critical, just tinkering, but it would be great if I could make use of these Hitachi Eproms I have.



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The datasheets look the same to me. My interpretation is that VPP could be held at 25V throughout the programming operation. Whether that is how your programmer works I don't know, but my guess is that is the simplest way to do it, so most likely. If you do make your own supply the only constraints are that VPP must not be applied without VCC being present and the absolute max value is 28V, though they spec it at Vcc +/- 0.6V.


There is a thread here that may help: http://www.mcumall.com/forum/topic.asp?TOPIC_ID=8202
Someone reporting the exact same problem and finding that VPP is only 21V on that programmer.

Edited by Derek Andrews
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