"Luch" quartz wristwatch IC : weekend die-shot

Inside old (199x) Belorussian wristwatch I've found this IC:


After metalization etch:
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PIC24EP32GP202 - microcontroller with opamps : weekend die-shot

Freescale/NXP MC56F82323 - 50MIPS DSP µC : weekend die-shot

Freescale/NXP MC56F82323 is a 50MIPS DSC (DSP-capable microcontroller).

Ti TPS62321 - 3-MHz Step-Down DCDC : weekend die-shot

Texas Instruments TPS62321 is a 3-MHz Step-Down DCDC converter with internal MOSFET and synchronous rectification.
Look at this staggering number of test pads!
Die size 1983x981 µm.

Toshiba 2SC3421 - NPN audio BJT : weekend die-shot

Toshiba 2SC3421 is a 120V 1A NPN BJT for audio applications.
Die size 1053x1055 µm.

Microchip MCP6V27 - auto-zero opamp : weekend die-shot

MCP6V27 is a CMOS opamp offering <2 µV input offset voltage. Datasheet have nice description of it's auto-zero operation principle (Page 21+).

AD MAT02 - supermatched BJT - real vs fake : weekend die-shot

LM394 gone first. Manufacturing of MAT02 stopped around 2010. No surprise it is hard to come by a real one from old stock.
Modern alternatives for low noise supermatched BJTs are Analog Devices MAT12 and the like.

Genuine one first (both Analog MAT02CH and MAT02EH are the same). Die size 1506x1407 µm. Image matches photo in datasheet.
PMI logo is Precision Monolithics, Inc, which was bought by Analog Devices back in 1990.


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