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Tube❄️Time

here's a fun chip! giant 64-pin package with the die mounted on the *bottom*

14 comments
Lauren Weinstein

@tubetime That's bizarre. I don't think I've ever seen that before.

Andrew Zonenberg

@tubetime Cavity-down DIP? I've seen one or two of those but not common at all.

Presumably done for thermal reasons?

Tube❄️Time

this is the IDT7212L 12-bit x 12-bit parallel multiplier IC. it can multiply numbers in 30ns and uses a lot less power than the old-style bipolar multiplier chips.

AGMS

12 bits suggests this could have been used to more cheaply add multiplication to a PDP-8. Though the data sheet more sensibly says it’s for digital signal processing.

Jonathan Hendry

@tubetime

You need a lift to service one of those. No bueno.

Graham Spookyland🎃/Polynomial

@tubetime my immediate visceral reaction was to want to slam my fist on it and make the pins splay out everywhere.

I should not be allowed near big DIP packages.

Stewart Russell

@tubetime regular ceramic, or the toxic high heat dissipation military-grade stuff?

anyMouse

@tubetime It's so that it's more convenient to sharpen knives on them!

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