On Sun, 15 Feb 2015, Charlie wrote:

On Sun, 15 Feb 2015 13:26:31 +0000, gareth wrote:

I gave you a URL in my reply in ura.

Yes thanks, but that just goes to a simplified summary not an actual data
sheet.

Why do you need the datasheet?

If you need to replace these devices in existing equipment, you probably
have to find the actual ICs.

If this is some old project you hope to build, you need to see if you can
get the ICs, unless you happen to have them already. Over the years
plenty of people have come here and asked about some device, not knowing
that the schematic they "found on the net" was old, and the IC or tunnel
diode no longer commonly available.

Michael