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PICList Thread
'logic level for pics'
1998\04\11@180335 by Bill Kennedy

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This is probably a very simple question, but I haven't been able to find it
in data book yet.  What is considered a logic low and logic high for the
12c5xxx and maybe it's the same for other pics as well.  I need to know if
it's anything like CMOS digital logic levels=>0-1.5 & 3.5-5.

Thanks,
Bill K.

1998\04\11@182034 by Andy Kunz

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>it's anything like CMOS digital logic levels=>0-1.5 & 3.5-5.

Bill,

Check the "Electrical Characteristics" for any chip.  Note that it is
possible for each chip to differ.

As a rule, 15% Vdd and below is "0" on all chips.

For 12-bit parts, 35% and above is "1".

For 14-bit parts, 85% and above is "1".

That's just a basic rule, and it doesn't always apply.

Andy


==================================================================
                    Andy Kunz - Montana Design
         Go fast, turn right, and keep the wet side down!
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1998\04\11@184939 by Bill Kennedy

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Andy,
   Thanks for info.  I did go back and check the 12c5xx data book again
(fifteenth time) for that spec in electrical specs and couldn't locate it.
Could you give me an idea of what key wording to look for?
Thanks
{Original Message removed}

1998\04\11@201728 by Mike Keitz

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On Sat, 11 Apr 1998 18:41:27 -0400 Bill Kennedy <spam_OUThueTakeThisOuTspamFRONTIERNET.NET>
writes:
>Andy,
>    Thanks for info.  I did go back and check the 12c5xx data book
>again
>(fifteenth time) for that spec in electrical specs and couldn't locate
>it.

Table 10.2, "DC Characteristics".  The levels are different for different
pins and different Vdd levels, no need to repeat in full here.  Every
PICmicro data sheet has a similar table near the back.


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1998\04\11@232301 by Bill Kennedy

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I have seen the light!  Thanks for the pointer.

Bill K.

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