Yahoo Groups archive

68300

Index last updated: 2026-04-29 00:01 UTC

Message

RE: [68300] Connecting to 332

2003-06-19 by Scott Newell

>2.  Most reset chips or supervisors (that I found anyway) do not recommend
>this low of a resistance (820 ohms) for reset lines.  They cannot handle the
>current draw.

I've had good luck with the Microchip MCP130 series and the Dallas/Maxim
DS1811. I have an older design using a MAX691, but that might be marginal
at 5V--reset pin spec is 7mA typ, 20mA max.  All the designs have the 820
ohm reset pullup, of course!


I was severely burnt by a '707 (not Maxim) chip on an HC11 run once...none
of the 100 boards would work, and it turns out that they were actually '807
silicon marked as '707 devices!  The manufacturer didn't want to believe
me, until I faxed the pages from my lab notebook and sent some of the chips
to 'em.  Got a fresh tube of factory tested parts for my trouble.


newell

Attachments

Move to quarantaine

This moves the raw source file on disk only. The archive index is not changed automatically, so you still need to run a manual refresh afterward.