Quote from Cafe on August 16, 2011, 06:59
Quote from Lob0426 on August 15, 2011, 01:54
Liz: how much more does the SMC 9514 chipset cost?
Here are the unit prices for different batch sizes at Digikey:
LAN9512 (2 USB, 1 Ethernet; used on the Raspi):
- 1 piece $7.6; 10K batch $3.72 http://bit.ly/nhotDe
LAN9514 (4 USB, 1 Ethernet):
- 1 piece $8.93; 10K batch $4.46 http://bit.ly/nf6UUY
The Raspi folks are likely buying in bulk of at least 10K. So, the 9514 costs ~75 cents more per piece. That from Digikey, so the difference can be a tad bit smaller in China (but not too much). Add to that the cost of more USB connectors.
Obviously, apart from cost, there are also electrical and physical board-design considerations (the size of the additional USB ports) in using the 9514 instead of the 9512. I assume the physical dimensions of the 9514 and 9512 are about the same; I haven't looked into the electrical aspects.
Late reply (been busy...)
Add ESD components, add EMC components, add boardspace and then add a some more because your 5V power supply triples in current output it has to supply. "Asks a man 'How much is a drop of petrol'. Pump attendant: 'Nothing'. 'OK', says the man' Just drip it full'.