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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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Signals not the same abbreviations as the circuit
| Note | ||||||||||||
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The names of the signals on the scope are not all the same as shown in the circuit.
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Printed Circuit Board
Main points
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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 | ||||||
| The 7 layers | Layout over the original PCB | ||||||
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| Here are the layers as a pdf file. The board is small, zooming in is generally helpful. | This shows the area of the original card the board will cover. C2 needs to be removed (if fitted). |
