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| Part No | Chip | Manufacture | Speed nS | Package | Price | |||
|---|---|---|---|---|---|---|---|---|
| Min | Typ | Max | ||||||
| 1741279 | SN74LVC1G139DCTR | Ti | <2.5 | SM8 | $ 0.69 | |||
| SN74LVC1G139DCUT | Ti / Farnell | <2.5 | VSSOP | £0.404 | ||||
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- Small holes 0.47 mm are drilled in the centre of the pads of H1,so that wire links may be used to connect the signals from the 512K/512K card to the PCB.
- The pads of the footprint of the SOT-23-5 have been made longer, to enable easier soldering of the small parts.
- The bottom Left Hand corner of the PCB matches the shape of the 512K/512K Card for easy alignment.
Final Layout
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Boards ordered 24/11/16
The one pixel blue line for the board size is difficult to see unless viewed full size.
| Size of board 23.11 x x15 mm | Layout with SO 16 footprint overlaid |
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| The final layout. | This shows that the holes line up with pads that need to be soldered |
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| The 7 layers | Layout over the original PCB |
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This shows the area of the original card the board will cover. C2 needs to be removed (if fitted).
The 7 layers
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| Here are the layers as a pdf file. The board is small, zooming in is generally helpful. |
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| This shows the area of the original card the board will cover. C2 needs to be removed (if fitted). |