DPRG
DPRG List  



[DPRG] serial to parallel shift register with _individually_tristate outputs

Subject: [DPRG] serial to parallel shift register with _individually_tristate outputs
From: Ed Paradis legomaniac at gmail.com
Date: Fri Oct 14 19:08:24 CDT 2011

Thanks for all the great ideas guys!  I was out for a week and coming
home to all these great ideas and pieces of information has overflowed
my buffer.  When I sort through the design parameters, I'll check back
in.

Ed

On Mon, Oct 10, 2011 at 11:33 PM, Paul Bouchier <bouchier at classicnet.net> wrote:
> Ed,
>
> If speed is an issue for you, you might consider a CPLD (Complex PLD) such
> as those from Altera, Lattice, etc. They have all the necessary internal
> feedback paths and tristate controls, and come in a wide variety of pin
> counts & packages. If your job is simple enough, a PAL may be enough. (Yes I
> know I'm harking back 20 years, but those devices make great I/O expanders
> and you still can't beat the combination of speed & flexibility with low
> cost & easy development.
>
> Just throwing my $0.02 in with everyone elses $0.20 :-)
>
> Paul
>
>> -----Original Message-----
>> From: dprglist-bounces at dprg.org
>> [mailto:dprglist-bounces at dprg.org] On Behalf Of Paul Burrell
>> Sent: Monday, October 10, 2011 7:21 PM
>> To: Ed Paradis; dprglist
>> Subject: Re: [DPRG] serial to parallel shift register with
>> _individually_tristate outputs
>>
>>
>> Ed,
>>
>> Not quite sure what you are trying to do, but look at the following.
>>
>> TPIC6595 from TI.   The have several version of this part
>> that have different FET capabilities.
>>
>> It is a 595 shift register with individual open drain FETs.
>> Although this does not have individual controls for each
>> output, the outputs can be configured to allow for an open
>> state.   When active, it connects to ground.
>>
>> There is another part similar by IXYS but is much less power
>> and smaller.   It is the MX879.  They have a small family of
>> parts similar.  The MX877 has push/pull capability.
>>
>> If you are really trying to tristate each output, then the
>> idea of a microcontroller or using some logic after (HC125)
>> should give you what you need.   If you can provide some
>> additional details, there might be some alternative solutions.
>>
>> Hope this helps.
>>
>> Paul
>>
>> ----- Original Message -----
>> From: Ed Paradis <legomaniac at gmail.com>
>> To: dprglist <dprglist at dprg.org>
>> Cc:
>> Sent: Saturday, October 8, 2011 10:34 AM
>> Subject: [DPRG] serial to parallel shift register with
>> _individually_ tristate outputs
>>
>> 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
>>
>>
>> _______________________________________________
>> DPRGlist mailing list
>> DPRGlist at dprg.org http://list.dprg.org/mailman/listinfo/dprglist
>
>

More information about the DPRG mailing list