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Schematics nomenclature

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  Schematics nomenclature DaveC <not@home.cow> - 2016-07-04 08:26 -0700
    Re: Schematics nomenclature "Tom Del Rosso" <fizzbintuesday@that-google-mail-domain.com> - 2016-07-04 12:49 -0400
      Re: Schematics nomenclature N_Cook <diverse@tcp.co.uk> - 2016-07-04 18:49 +0100
    Re: Schematics nomenclature Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2016-07-04 21:11 +0300
    Re: Schematics nomenclature Don Y <blockedofcourse@foo.invalid> - 2016-07-04 11:22 -0700
      Re: Schematics nomenclature DaveC <not@home.cow> - 2016-07-04 12:45 -0700

#5991 — Schematics nomenclature

http://imgur.com/KWFIN1H

Pins 12 and 13 have a little triangle next to the pin; pins 1, 2, 15, 16 have 
what looks like an “n”; 3 and 14 have an “x”.

What’s the meaning of these marks?

Thanks.

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#5992

DaveC wrote:
> http://imgur.com/KWFIN1H
>
> Pins 12 and 13 have a little triangle next to the pin; pins 1, 2, 15,
> 16 have what looks like an "n"; 3 and 14 have an "x".
>
> What's the meaning of these marks?

That's the IEEE standard schematic notation touted by TI in the 80's. 
The downward sloping triangle means logical inversion, or active-low.  I 
don't remember the others.

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#5993

On 04/07/2016 17:49, Tom Del Rosso wrote:
> DaveC wrote:
>> http://imgur.com/KWFIN1H
>>
>> Pins 12 and 13 have a little triangle next to the pin; pins 1, 2, 15,
>> 16 have what looks like an "n"; 3 and 14 have an "x".
>>
>> What's the meaning of these marks?
>
> That's the IEEE standard schematic notation touted by TI in the 80's.
> The downward sloping triangle means logical inversion, or active-low.  I
> don't remember the others.
>
>

In that case "x" means don't care

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#5994

On 4.7.16 18:26, DaveC wrote:
> http://imgur.com/KWFIN1H
>
> Pins 12 and 13 have a little triangle next to the pin; pins 1, 2, 15, 16 have
> what looks like an “n”; 3 and 14 have an “x”.
>
> What’s the meaning of these marks?
>
> Thanks.


The 'n' pins are non-logic signals. The 'x' pins are power supply pins,
see the chip data sheet.

-- 

-TV

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#5995

On 7/4/2016 8:26 AM, DaveC wrote:
> http://imgur.com/KWFIN1H
>
> Pins 12 and 13 have a little triangle next to the pin; pins 1, 2, 15, 16 have
> what looks like an “n”; 3 and 14 have an “x”.
>
> What’s the meaning of these marks?

The little triangle (sort of like half an arrowhead?) denotes active low
(what used to be indicated by a "bubble").  The tip of the arrow indicates
the direction of signal flow.  Can appear on a gazinta or a cumzouta.

A (real!) triangle inside the device outline denotes a dynamic/clock input
(edge)

The "n" (actually, more like an upside down U) denotes an analog signal
(look at the device and you can see why this is so!) when encountered on
a digital signal; a '#' indicates a digital signal when encountered on
an analog signal.

The 'x' indicates a "non-logic" signal (in yor case, the reference gnd)

There are other markings that indicate postponed outputs, tristate outputs,
open-collector, open-emitter, hysteresis, etc.

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#5997

On 4 Jul 2016, Don Y wrote:

> The "n" (actually, more like an upside down U) denotes an analog signal
> (look at the device and you can see why this is so!) when encountered on
> a digital signal; a '#' indicates a digital signal when encountered on
> an analog signal.

??

"when encountered on”? So both of these pins are mixed-signal? “n” is 
mostly-digital and # is mostly-analog? (c;

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