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Multichip Packages FAQs

Multichip Packages(8)
Do you have any reliability data on the PoP?
Yes. We do have reliability data on the PoP. Contact Micron for more information.
For a PoP/MCP, does the qualification testing at the factory differ from testing on the discrete components?
No. the PoP/MCP parts undergo the same qualification testing as the discrete components.
How do I know the Micron part number for the part on the Beagle Board?
The Beagle Board uses our NAND + Mobile LPDDR PoP combination parts, and the densities vary depending on which version of the Beagle Board you have. Type the second 5-digit alphanumeric code on the physical part into our FBGA Decoder, which will provide you with the corresponding Micron part number.
I’ve heard that opting for a PoP/MCP solution is more expensive than using discretes, so why should I use it?
From a system-solution perspective, because the PoP mates directly onto the processor, it eliminates the need to have traces routed on the PCB. This saves costs for the customer, as well as provides better signal integrity.
Our contract manufacturer has little experience with PoP. Why should we try something new?
The market is driving the requirement for the smaller PoP form factor, and several contract manufacturers have already enabled this technology. PoP can help save in routing costs and improve signal integrity. Given those cost and performance advantages, Micron recommends that you work very closely with your CM to ensure a good transition to this technology. Micron worked closely with Texas Instruments (TI) on the technical notes PCB Design Guidelines Part I and PCB Assembly Guidelines Part II. These can also help provide guidelines to help you work with your CM for the best success on your conversion to PoP.
We designed in discrete parts, but now we are using PoP parts. They appear to be limited in what speeds we can achieve. What is the problem?
When moving from testing with discrete parts to PoP, care should be taken that no stubs are left from the design containing the discrete components. If needed, a 0 Ohm resistor could isolate the memory from the traces used for the discrete part.
What are your PoP/MCP offerings for x8 NAND and/or x16 Mobile LPDDR?
Our standard offerings are x16 NAND and x32 Mobile LPDDR. We also have x8 NAND and x16 Mobile LPDDR. For the most current information, contact your local Micron support.
What is an MCP? What is a PoP? What is the difference between the two devices?

MCP is multichip package that contains multiple die and can be used by any controller. PoP is a form of an MCP made specifically to stack on top of a processor that has pads on the top side that mate to the ballout of the PoP. Because the PoP package stacks right on top of the processor, it eliminates the need to have traces routed on the PCB and provides better signal integrity. A variety of PoP packages are designed for various processors. PoP and MCP devices give designers the ability to take advantage of z space and to provide the flexibility to offer different logic in one package (for example, NAND + Mobile LPDDR or e.MMC™ + NAND + Mobile LPDDR). We have a wide selection of offerings to meet our customer’s needs.