220.127.116.11. Sample PCB Routing Scheme on 2 Layers for 0.5-mm 256-pin and 100-pin MBGAs
In 2006, 0.5-mm pitch Micro FineLine BGA® (MBGA) packages is introduced in the MAX® II device family. The size and weight of these packages make them suitable for portable applications or any application that has board space and/or power constraints. The pin layout and the pin assignments have been designed so that the signals from solder pads can be routed in 2 layers using through-hole vias. Examples of layout schemes for routing on 2 layers is demonstrated in the following figures for the 100-pin and 256-pin MBGAs, respectively. This layout type is suitable for PCB thickness smaller than or equal to 1.5 mm. For PCB thickness greater than 1.5 mm, application of blind vias may be more suitable for escape routing. Additional MBGA packages have been added to the portfolio since 2006 and sample escape routing for these are shown in this section.
In this section, sample PCB routing schemes use VCCN and VSS. In the pin table, VCCN and VSS correspond to VCCIO and GND, respectively.
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