[Coco] XPander-Coco lives!

[RETRO Innovations]

On 5/1/2016 7:30 PM, Zippster wrote:
> I’ll look into an open drain part, the MAX811 was just what I had on hand patching up the boards.
>
> - Ed
>
>> On May 1, 2016, at 7:25 PM, RETRO Innovations <go4retro at go4retro.com> wrote:
>>
>> On 5/1/2016 6:13 PM, Zippster wrote:
>>> That’s a good point I didn’t give much thought to.  I know the reset switch works ok,
>>> but that doesn’t mean something else would.
>>>
>>> Since we’re working with a CPLD in the mix on these boards, I guess the reset
>>> signal to the cart ports could be routed through it, and used to toggle !MR on the MAX811.
>> I'd instead recommend an open drain supervisor, which are plentiful.  They work the same as the MAX811, but the RESET output is open drain.
>>
>>
>> -- 
>> Coco mailing list
>> Coco at maltedmedia.com
>> https://pairlist5.pair.net/mailman/listinfo/coco
>
I put the following in my cart to buy:

http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail&itemSeq=196005954&uq=635977197923854587

MIC803, which seems much cheaper than the MAX811 ($.22 versus $2.10 @100s)

I chose a 4.38 device, but it appears MIC offers a ton of threshold 
voltages.

Jim


-- 
RETRO Innovations, Contemporary Gear for Classic Systems
www.go4retro.com
store.go4retro.com