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Altera_Forum's avatar
Altera_Forum
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15 years ago

Cyclone III with 5v inputs

I'm trying to connect approximately (16) 5v TTL inputs into a Cyclone III eval board, the terasic de0 [1]. These are all input towards the FPGA only. The eval board has (2) 40-pin IDC headers for t...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

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I sampled these today from TI, although they only had the DBQ(SSOP/QSOP) parts available. I prefer SOIC with the larger 1.27mm pitch. I've soldered the SOIC before, and they weren't bad. The SSOP have half the pitch.

Any experience hand soldering these?

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Soldering SSOP is easy. You tack the diagonal corners to get the pins aligned, and then wipe a flux pen over the pins, then solder, creating shorts by accident, then you go back with solder wick and clear the shorts. Wet the solder wick with a flux pen first, and the shorts are easily removed.

Cheers,

Dave