74HCT595 shift register in DIP package?

[Matt Wetherill]

Hi all,
My reacquaintance with Nixie's is progressing well and I'm looking at experimenting with driving them via a Raspberry Pi. I know this is complete overkill but it makes for a nice experimentation platform and I'm comfortable with Python (so eases the learning curve!).

With this in mind and given the Pi's low GPIO pin count, I want to experiment with shift registers and I believe that the 74HCT595 is suitable for driving via from the Pi's 3.3v logic. However, I'm having difficulty finding this chip in a DIP package.

Does anyone know of a source of these shift registers in DIP form (or indeed any equivalents)?

Many thanks
Matt

[Dylan Distasio]

Others more knowledgeable than myself may offer a better suggestion, but I believe if you power the 74HC595 with a 3.3V power supply, it will work fine as a shift register for the Pi.  I have not actually tried this, but a quick google shows them being used quite a bit on the Pi.  I haven't actually hooked mine up to a shift register yet so I don't speak from personal experience though.

The 74HC595 in a DIP package is easy to find.

Matt

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[John Rehwinkel]

> With this in mind and given the Pi's low GPIO pin count, I want to experiment with shift registers and I believe that the 74HCT595 is suitable for driving via from the Pi's 3.3v logic. However, I'm having difficulty finding this chip in a DIP package.

DigiKey has 'em, part number 568-1560-5-ND, $1.97 apiece.

I just did a search for 74HCT595, then filtered by DIP package type and got that part.

- John

[David Forbes]

Matt,

You will do much better searching for the 74HC595 rather than the
74HCT595. It has different (CMOS) input threshold voltage, but it's
widely available in DIP for much less money.


--
David Forbes, Tucson AZ

[Matt Wetherill]

Thanks all for the replies,

Research on the web highlighted a couple of people who say they had
trouble driving 74HC595 chips from the 3.3v logic outputs on the Pi
however this may well be inaccurate - I am get hold of a few and give
them a try. They are easily available from Farnell here in the UK.

Thanks for the Digikey pointer - if it turns out that I do need
74HCT's then that's a good option although shipping to the UK is a bit
of a killer.

Matt

[David Forbes]

Matt,

You won't have a problem if you drive the 74HC595 from 3.3V also.

It works down to 2V!

[Matt Wetherill]

On 29 Nov 2013, at 16:15, David Forbes <dfo...@dakotacom.net>

>
> Matt,
>
> You won't have a problem if you drive the 74HC595 from 3.3V also.
>
> It works down to 2V!
>
>
> --
> David Forbes, Tucson AZ
>

> --

Thanks David,
I just took a look at the spec sheets and you are of course absolutely right!

That'll teach me to believe random stuff I read on the Internet - doh!

Matt

[Jonathan Peakall]

I have used the HC part many times with CMOS uC's and never had a
problem. I am never doing super high speed though. Just one data point,
YMMV.

Jonathan

[Chris Stalin]

No issues at 3.3V

Ebay.com - 10 for about 2$
http://www.ebay.com/itm/10PCS-IC-74HC595-74595-SN74HC595N-8-Bit-Shift-Register-DIP-16-NEW-GOOD-QUALITY-/290739784423?pt=LH_DefaultDomain_0&hash=item43b1710ae7

Gluck