Unknown Circuits - die pictures

[Noopy]

Let´s start a new topic for unknown circuits.
UICs - Unknown Integrated Circuits? 




This component contains the letters WE, the character sequence F61489 and the numbers 2384. 2384 could be a date code, which would then refer to the year 1984. WE probably stands for Western Electric. This is also supported by the integrated circuit. F61489 could be the designation of the component. 






The die has several testpads. There are large contacts on the edges, which were probably mainly used to tune the circuit. There are also many small contact areas within the circuit that are only suitable for special tests. A clear division into two parts is recognisable in the structures. The right part is smaller but contains very similar areas. The image is available in full resolution: https://www.richis-lab.de/images/TBD/01x03XL.jpg (24MB)




The only labelling can be found on the left edge. BKA, JRB and TM could be the initials of the developers. M7062D appears to be an internal project designation.






Some test structures have been integrated in the bottom left-hand corner and at the bottom edge, which make it possible to check the alignment of the masks against each other.




There are resistance strips on each side, whose resistance values can be set with a few testpoints and fuses.




The upper section contains structures that are typical for switched capacitor filters. The functionality of such filters is described in more detail with the U1001 (https://www.richis-lab.de/phone01.htm). The repeating structures of several opamps can be clearly recognised. These opamps are connected with different capacitances, which are represented by individual rectangles.

The filters indicate that this is indeed a Western Electric component. Western Electric was very active in the telecommunications industry. It therefore seems very likely that, like the U1001, it is a transmit and receive filter for digital transmission links.




The control logic is integrated in the lower section of the module.


https://www.richis-lab.de/TBD01.htm

 

[RoGeorge]

First!