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[DPRG] Subject: serial to parallel shift register with _individually_ > tristate output

Subject: [DPRG] Subject: serial to parallel shift register with _individually_ > tristate output
From: terry at yourduino.com terry at yourduino.com
Date: Mon Oct 10 12:16:55 CDT 2011

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> Today's Topics:
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>    1. serial to parallel shift register with _individually_
>       tristate outputs (Ed Paradis)
>    2. Re: serial to parallel shift register with _individually_
>       tristate outputs (Wes Grimes)
>
>
> ----------------------------------------------------------------------
>
Hi Ed,

I have never seen such a chip. I think you'd have to follow a 74hc595 or
whatever with a separate TriState driver chip with individual enables. I
THINK the old 74365 had 4 separate drivers in a ??14 pin package?  Long
ago :-)

IF you're using a microcontroller you can control each output??

Regards, Terry King
...On the Mediterranean in Italy
terry at yourduino.com

---------------------( COPY )--------------------------
> Message: 1
> Date: Sat, 8 Oct 2011 13:34:51 -0400
> From: Ed Paradis <legomaniac at gmail.com>
> Subject: [DPRG] serial to parallel shift register with _individually_
> 	tristate outputs
> To: dprglist <dprglist at dprg.org>
> Message-ID:
> 	<CA+ho0VxxHx=jCGfkAtKuw0pm980A_U_Wx_o15F8v=bjTX9VNDw at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Does anyone know the part number of a serial-to-parallel shift
> register that allows you to set the outputs hi-Z individually?  I'm
> having a hard time finding a device because there are many that let
> you tristate the whole bank of outputs.
>
> Thanks,
> Ed
>
>
> ------------------------------
>
> Message: 2
> Date: Sat, 8 Oct 2011 14:07:34 -0700 (PDT)
> From: Wes Grimes <wesgrimes_2000 at yahoo.com>
> Subject: Re: [DPRG] serial to parallel shift register with
> 	_individually_	tristate outputs
> To: Ed Paradis <legomaniac at gmail.com>, dprglist at dprg.org
> Message-ID:
> 	<1318108054.86276.YahooMailClassic at web160318.mail.bf1.yahoo.com>
> Content-Type: text/plain; charset=iso-8859-1
>
> 74hc595 is either on or open (hi-z) to my understanding. If you need on or
> off, add a pull down resistor to the output. If you are looking for a
> shift register that is either on, off, or open (tri-state) I don't think
> that exists. The answer would be to double the number of registers and
> inverse the output of the ones you want to go to ground. A byte can only
> give 8 instructions of either on or off, so a shift register can only be
> bi-state.
>
> --- On Sat, 10/8/11, Ed Paradis <legomaniac at gmail.com> wrote:
>
>> From: Ed Paradis <legomaniac at gmail.com>
>> Subject: [DPRG] serial to parallel shift register with _individually_
>> tristate outputs
>> To: "dprglist" <dprglist at dprg.org>
>> Date: Saturday, October 8, 2011, 12:34 PM
>> Does anyone know the part number of a
>> serial-to-parallel shift
>> register that allows you to set the outputs hi-Z
>> individually?? I'm
>> having a hard time finding a device because there are many
>> that let
>> you tristate the whole bank of outputs.
>>
>> Thanks,
>> Ed
>> _______________________________________________
>> DPRGlist mailing list
>> DPRGlist at dprg.org
>> http://list.dprg.org/mailman/listinfo/dprglist
>>
>
>
>
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> End of DPRGlist Digest, Vol 89, Issue 6
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