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'Reset Controllers -- Whats the Cheapest?'
1998\04\01@095452 by Scott Walsh

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    Chaps,

    I know this has come up over the last twelve momths, but what reste
    controllers do people use, and what is the best prices they have got.

    I need to have a reset asserted at 0V for a system that runs at a
    nominal 3.3V as it is battery powered.

    The decision I need to make is what are the advantages of say the
    Dallas  DS1816 compared to a little PNP circuit and a few C's and R's,
    all comments are welcome!

    thanks in advance,
    SW.

1998\04\01@121408 by wwl

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On Wed, 1 Apr 1998 15:42:06 -0800, you wrote:

>     Chaps,
>
>     I know this has come up over the last twelve momths, but what reste
>     controllers do people use, and what is the best prices they have got.
>
>     I need to have a reset asserted at 0V for a system that runs at a
>     nominal 3.3V as it is battery powered.
>
>     The decision I need to make is what are the advantages of say the
>     Dallas  DS1816 compared to a little PNP circuit and a few C's and R's,
>     all comments are welcome!
>
>     thanks in advance,
>     SW.
You can get ultra-low power (1uA) reset ics in TO-92, SOT23 and SOT89
>from Holtek, Telcom, Ricoh and a few others. 2V7 is a standard
voltage, but others can usually be supplied to order. Probably cheaper
than Dallas.

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1998\04\01@134257 by Harold Hallikainen

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       Dunno if it's the cheapest by the time you count parts
installation and board space, but I like my circuit that uses a 74HC14 as
a combination reset generator and watchdog timer.  One section is set up
as an asymmetrical astable multivibrator.  On power up, its output is
driven low for a short period of time (since the timing capacitor on the
input is connected to + supply instead of ground).  Another section
"kills" the astable, resetting the timer each time a watchdog reset pulse
comes along.  The watchdog reset pulse is AC coupled into the circuit so
that a stuck reset does not keep the timer from timing out.
       Again, dunno if it's the cheapest...

Harold



On Wed, 1 Apr 1998 15:42:06 -0800 Scott Walsh
<.....Scott.WALSHKILLspamspam@spam@PLANTRONICS.COM> writes:
{Quote hidden}

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