Help identifying some ICs

[W1ngs]

I've got a few interesting ones here, one of which looks quite interesting. I've been able to find little about these, but I'm sure some will recognize them. Any ideas?

[retiredfeline]

That Motorola IC at the top right with the rounded corners and cute dimple on pin1 looks like the DTL chips I have and if 74 is the year, could be a fit. But the ID isn't familiar. Could be a custom or OEM ID. It could also be a non-logic IC too I guess.

[W1ngs]

Interesting! I do have a bunch of DTL (including MDTL) here but none of them look like this one. I've got other Motorola chips of that age for linear stuff.

That Motorola IC at the top right with the rounded corners and cute dimple on pin1 looks like the DTL chips I have and if 74 is the year, could be a fit. But the ID isn't familiar. Could be a custom or OEM ID. It could also be a non-logic IC too I guess.

[wasedadoc]

The one marked 710 might be a uA710 (mu A) comparator.

[RES]

(Motorola) M 7850 442-62 is a heathkit part number code. (442-62 not in this list: http://www.d8apro.com/heath3.htm )

[retiredfeline]

(Motorola) M 7850 442-62 is a heathkit part number code. (442-62 not in this list: http://www.d8apro.com/heath3.htm )

Ha, MC1358P if this document is to be believed: https://www.yumpu.com/en/document/view/27722705/heathkit-cross-reference-italy

[Haenk]

The 50210 look like Precision Monolithics (PMI).

Edit: The printing might confirm this: https://www.ebay.com/itm/333850317674

Edit2: PMI only did have a handful of chips in 1972, unfortunately, none of these resemble the part# of the ones shown. Maybe crack one open to confirm if it's an OPAMP or DAC.

Edit3: 29011 found here as well: https://physicsmuseum.uq.edu.au/cross-section-display-transistors-and-ics

[W1ngs]

I saw that site in my search for 29011; sadly no info though and I'm definitely not willing to open it.

Edit3: 29011 found here as well: https://physicsmuseum.uq.edu.au/cross-section-display-transistors-and-ics

[factory]

29011 is the custom counter IC used in the Advance DMM2 multimeter, I have one here that has two defective outputs.



David

[W1ngs]

Ah! That explains why I have these; I parted out three of those Advance DMM2 multimeters! Are you needing another chip for yours?

EDIT: I remember this chip now; it was pulled out (and mangled) and stuck to a piece of paper with a note saying it was bad and was expensive to replace. I'll keep an eye out if I saved any from the ones I tore apart.

29011 is the custom counter IC used in the Advance DMM2 multimeter, I have one here that has two defective outputs.

[W1ngs]

Found this other thread and a mention GI MicroElectronics (General Instrument). This explains the GIM marking. Apparently it might be an AY-5-4057. Just a BDC counter. I'll breadboard this up and see if it does anything. Here's the thread mentioning the chip https://www.eevblog.com/forum/repair/faulty-yet-irreplacable-ic/

[factory]

It's not the same as the as AY-5-4057, pinout is different, it more than just a counter, it does the latching & display multiplexing, I've got about 90% of the function with a board full of 74 series.
https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/msg4615303/#msg4615303

P.S. since then I've found out my DMM2 does not match the circuit diagram in the manual.

David

[W1ngs]

Taking a second look at things, the PMI chips say CMP-01 on the bottom.... That is a well-known PMI comparator, but normally appears in an eight lead DIP or TO-5 style package... I dismissed the possibility of a DIP-14 package CMP-01 and shouldn't have. I found a 1976 databook from PMI depicting a DIP-14 version at http://www.bitsavers.org/components/pmi/_dataBooks/1976_PMI_Linear_and_Data_Conversion_IC_Products.pdf! (Page 7-1 [PDF page 106]).

I think I have some PMI DACs here... perhaps I shall waste some time and implement a vintage SAR ADC.

[W1ngs]

The 4057 does latching and display MUX though? I see that the pinouts are different, so they must be different chips, but in the 4057 datasheet it does indeed provide multiplex outputs for four digits of display.

It's not the same as the as AY-5-4057, pinout is different, it more than just a counter, it does the latching & display multiplexing, I've got about 90% of the function with a board full of 74 series.

[W1ngs]

I think you're right. Amusingly, the datasheet I found for the 50210 (CMP-01 on the bottom) mentions 710s!

The one marked 710 might be a uA710 (mu A) comparator.

[factory]

The 4057 does latching and display MUX though? I see that the pinouts are different, so they must be different chips, but in the 4057 datasheet it does indeed provide multiplex outputs for four digits of display.

It's not the same as the as AY-5-4057, pinout is different, it more than just a counter, it does the latching & display multiplexing, I've got about 90% of the function with a board full of 74 series.

Yes they both have latch & mux, but the 29011 isn't quite a full 4 decade counter though, max count is 1999 for the DMM2 and once it exceeds that it uses the 2 from the 2000 count for the overload indicator lamp.

David