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Tube❄️Time

mystery chip: Fujitsu MB737. what could it be?
11 April at 0:21 | Open on mastodon.social
5 comments
Tube❄️Time

hmm could be a dual driver or comparator. it's got two beefy output stages. I don't see any compensation capacitors so I don't think it is an op amp.
11 April at 0:26 | Open on mastodon.social
junkman

@tubetime

How do you decap the chips? I always these photo’s super interesting.

11 April at 19:42 | Open on social.sdf.org
Tube❄️Time

@junkman ceramic package so I knocked the lid off with a screwdriver

12 April at 0:21 | Open on mastodon.social
Tube❄️Time

I think it might be some sort of ECL level shifter. using a multimeter to measure ESD diodes, I think this thing has two supply rails, one of them negative.
12 April at 0:20 | Open on mastodon.social
Alexand

@tubetime

Do you know already or were you asking?

It’s a 16-pin EEPROM, newer MB series are/were marketed as FRAM being faster and having greater flash cycles than traditional EEPROM but given that package it’s probably first gen FRAM or last gen EEPROM.

11 April at 0:31 | Open on toad.social
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