Newsgroups: comp.robotics
Path: brunix!sgiblab!swrinde!ihnp4.ucsd.edu!library.ucla.edu!csulb.edu!csus.edu!netcom.com!nagle
From: nagle@netcom.com (John Nagle)
Subject: Re: desperate for low volt inhibit
Message-ID: <nagleCoD8Ey.Fp3@netcom.com>
Organization: NETCOM On-line Communication Services (408 241-9760 guest)
References: <1994Apr15.215159.28387@mnemosyne.cs.du.edu>
Date: Sat, 16 Apr 1994 18:52:10 GMT
Lines: 30

anon19af@nyx10.cs.du.edu (Name withheld by request) writes:
>Hi roboters,  for a school project we need 3 low voltage inhibitors.  Part
>numbers are:  Motorola MC34064p-5 Sieko 8054.  We have tried everyplace we
>know of help!

      The Motorola MC34064P-5 is an "undervoltage sensing circuit."
It's a 3-pin device in a TO-226AA package, like a transistor.  If the
input drops below 4.6V, the _RESET output drops.  It's in the 
Motorola linear databook.   You're probably using it to make a MC68HC11 reset
properly on power-down.  You can also use the MC33064P-5, which is the
same part with a broader temperature range.

      Digi-Key and Mouser don't have this part.  (They don't carry
Motorola linears) You can probably get
it through one of the big distributors like Hamilton/Avnet, but you
get hit on the minimum order charge, and this part is only worth about
a quarter.

      Try calling Motorola tech support at 1-800-521-6274.  Ask them
for a distributor that has it.  Also ask for a sample.  Most semiconductor
manufacturers will send you two of any cheap part if you ask nicely.

      If you can't get the part, jumper the input to the the _RESET output,
and the CPU will work, although you lose the clean shutdown on power fail.
If this is a 68HC11, you can get EEPROM overwrites this way, although it
is unlikely.  See my previous posting on 68HC11 powerdown.

      Why post anonymously?  

					John Nagle
