Nixie driver chips

[andybiker]

I know there were several plasma driver chips used in the early 90s (I have some SN751518s used from a laptop neon display)
I have data on these and they are open drain - ideal nixie drivers but these chips have been obsolete for years.

Modern-ish plasma televisions use newer chips.
I recently scrapped a plasma tv and it uses SN755870 (I also have a board containing SN755881 from a different TV)
These seem to be absolutely made as nixie drivers.
They run off 5v (unlike the supertex devices), have push-pull outputs, any output could be 200v or ground.
This could be a universal driver for direct-drive (64 output pins) or multiplexed (pins can be set to HT and used as anode drivers)
Does anyone have any data on SN755870 and sn755881 ?
I can find a pinout and that's it.
These chips seen cheap and readily available new or from old TVs
Cheers,
Andrew

[GastonP]

Hi Andrew...
   Here is a link to a place where a piece of the datasheet is.

http://radiocom.dn.ua/image/data/pdf/SN755870.pdf

Be patient as it takes some time to load it.
Regards
   Gaston

[Andrew Jardine]

Hi Gaston,

 

Thanks for this but this is the same pinout that I have.

The diagram looks as if it’s part of a TV manual, there must be full datasheets available somewhere!

These chips are readily available, cheap, run on 5v and are fast!

They really seem like ideal nixie drivers.

If I can’t find any full datasheet then I’ll try some experimentation.

 

Thanks again,

Andrew

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[gregebert]

I wouldn't design a clock without a full datasheet; this looks like a totem-pole output driver, and the internal design of a chip that can do that at high-voltage is not trivial.

I looked at the offerings from Supertex, and their 64-bit push-pull driver IC can only run up to 180V, which is marginal for nixies.

Maybe TI did a custom IC for plasma displays (guessing here, based on the SN part number prefix), so a full datasheet may not be publicly available.

The funny thing here is when I do a parametric search for SN75151 on ti.com, it pre-hits to SN751518, but does not offer-up a datasheet. So I think there's something on their website, but not for public access.

[Terry S]

My suggestion would be to contact your friendly TI applications engineer. The good ones live to track down this kind of thing, even for hobbyists.

When I was maybe 13 years old, I contacted TI and they sent me samples of the SN74143.... to build a project out of Popular Electronics.  And yes, they created a lifetime customer. I've done literally millions of dollars of business with TI.

Terry