Author Topic: [Solved] Identify NEC BI0474 734P902 -8 chip  (Read 777 times)

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Offline Retirednerd2020Topic starter

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[Solved] Identify NEC BI0474 734P902 -8 chip
« on: October 14, 2019, 08:48:51 pm »
I have a bunch of these from a Gould logic analyzer tear-down.  They appear to be memory devices, I think -8 is probably 8nS speed.   Does anyone have a data sheet on these?  I couldn't find anything using the usual searches.  PN may be B10474 vs BI0474.   These are 24 Pin ceramic DIP devices.  My guess is that they are static memory but only a guess.

Thank you for your help.
« Last Edit: October 16, 2019, 03:50:41 pm by Retirednerd2020 »
 

Offline amyk

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Re: Identify NEC BI0474 734P902 -8 chip
« Reply #1 on: October 15, 2019, 03:03:19 am »
Pictures would help...
 

Offline jhpadjustable

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Re: Identify NEC BI0474 734P902 -8 chip
« Reply #2 on: October 15, 2019, 03:28:17 am »
Data is thin on the web, but uPB10474 seems to be a 1kx4-bit 10K ECL RAM. Found this, though.
"There are more things in heaven and earth, Arduino, than are dreamt of in your philosophy."
 
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Offline Retirednerd2020Topic starter

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Re: Identify NEC BI0474 734P902 -8 chip
« Reply #3 on: October 15, 2019, 05:31:18 pm »
Thank you jhpadjustable!   Try as I might I could not find that datasheet.  I think I even looked at Datasheetcatalog.com, must have typed it wrong... That is the correct part data as it fits with the rest of the ECL logic on the board and power/ground locations etc.   The ones I have appear to be a prior generation or maybe just a slower speed than the datasheet shows.    Case closed!

amyk - No pics, sorry.  Away on travel right now.  It is a narrow cerdip with a shiny steel center cover.  Marked "NEC" and with the numbers I included above.
 

Offline dom0

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Re: Identify NEC BI0474 734P902 -8 chip
« Reply #4 on: October 15, 2019, 11:38:49 pm »
I always find it amusing how almost every chip is marketed with "Low power" on datasheet page no 1. "Low power - 1.6 W". [Of course this is actually reasonable for ECL, but there really isn't anything "low power" about ECL devices in general].
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