More on the Mystery CCD

Yesterday I posted about a mystery CCD that I found in a flatbed scanner. It has no part number on it; all I knew was that it has 22-pins. I was hoping that it was like an LCD module---multiple vendors but a single footprint. Sadly, this is not the case.

Proof by counterexample: Toshiba produces at least two 22-DIP CCDs with incompatible footprints: the TCD1707D and the TCD2905D. From my analysis below, I now know that this CCD is neither of those.

I pulled out the continuity tested and started tracing connections. Here's what I've found:

1. GND
2. GND
3. buffered input 1
   
4. GND
5. buffered output 1
   
6. +12V
7. GND
8. buffered input 2
9. buffered input 2 (8 and 9 are the same)
   
10. GND
11. GND
12. GND
13. odd, see below
14. buffered input 3
15. +12V
16. GND
17. buffered output 2
18. buffered output 3
19. GND
20. buffered input 4
21. GND
22. GND

By "buffered input," I mean that the pin is driven by a 74HC04 inverted, through a resistor. By "buffered output," I mean that the pin is fed into a simple transistor inverter. By "odd", I mean that two '04 inverters are put in series and drive themselves through a capacitor. The output also drives this pin through a resistor.

Since this device has three outputs, I infer this is a color CCD. I suppose I could have read the packaging on the scanner, but I threw it out before I thought to check.