Re: CD4013 Vdd?

From: Mark Jones (abuse_at_127.0.0.1)
Date: 11/10/04 

Date: Wed, 10 Nov 2004 16:05:32 -0500

Ken Smith wrote:
> In article <4191559A.4861DDF5@rica.net>,
> John Popelish <jpopelish@rica.net> wrote:
>
>>Mark Jones wrote:
>>
>>> Question, the CMOS 4013 flip-flop data*** says Vdd can be -0.5 to
>>>+18v, and recommended operating range is from 3.0v to 15v. But will it
>>>operate at 2.0v? Speed is not an issue.
>>>
>>>http://www.megatronics.lk/data/4000/hcf4013.pdf
>>
>>Don't expect any two to operate similarly, though you might find some
>>that work. I suggest you start with a chip based on a lower voltage
>>process like the HC, HCT, ACT, AHC family.
>
>
> No-one else said it so "just use a PIC". They work down to 2.0V at slow
> clock speeds.
>
> If you care about the low static Idd, most HC parts are OK in that regard
> but you have to spec. the suppliers because others aren't.

  Thanks. Actually I'm looking for a way to switch on power to a
PIC16LF876A design running from a single lithium ion AA battery
(4.2v-2.5v.) The design only has one button, so a low-going signal
must turn it on (and consume next to nothing when off.) I was
wondering if a 4013 connected to Vdd and Vss via this button, could be
turned on by the button (which then latches and powers up the PIC.) A
MOSFET was also a consideration, great off resistance but it's hard to
get good conduction with only 2.5v gate voltage. K.I.S.S...

-M

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