Sunday, March 25, 2012

Mostek MK5009P


"Mostek industrial products: Counter Time-Base Circuit". Found this in a junk drawer already opened. It was stored in a vial but it seems to have taken some damage. I meant to rotate the map, might re-upload a fixed version later.

Sunday, March 18, 2012

National Semiconductor DM7474J

"Dual D-Type Positive-Edge -Triggered Flip-Flops With Preset And Clear"

This was decapped by heating with a mini butane torch and dripping water on top so that the glass seal cracked. The lid was then removed and photographed in package. I had some pictures of the pinout and now I'm quite annoyed that the seem to have disappeared.

Saturday, March 10, 2012

AWS scale controller

AWS scales are decent bang for buck. Unfortunately, they don't have reverse voltage protection and mine died after I plugged the wrong polarity adapter into it. Heres to its memory.

Wiki page / map link:

Still on board:

This chip uses aluminum bond wires which are less common but maybe more so for high volume electronics. I don't know exactly how many of these they sell but anything that is COB tends to fall under that category. I used H2SO4 to decap it and so while the PCB has been de-epoxied the copper traces are still intact.

Another interesting thing is that it has bus cheesing (the slits in the power rails around the chip) as well as fill patterns which generally suggests 350 nm or less and/or CMP. However, it appears to be non-planarized as you can see wires making imprints as they cross.

Sunday, March 4, 2012

Xilinx XC9536XL

Wiki page / map link

Apologies but this ones a bit filthy. I've gotten better at cleaning things but took this a while ago.

The datasheet describes this as being two "54V18 Function blocks" meaning two areas with 54 inputs and 18 outputs. The die is pretty symmetric so its easy to guess where these top level blocks are.