ZHCSG69E November 2016 – May 2018 DM505
PRODUCTION DATA.
Table 7-15 shows the minimum stackup requirements. Additional layers may be added to the PCB stackup to accommodate other circuitry, enhance signal integrity and electromagnetic interference performance, or to reduce the size of the PCB footprint.
LAYER | TYPE | DESCRIPTION |
---|---|---|
1 | Signal | Top signal routing |
2 | Plane | Ground |
3 | Signal | Signal routing |
4 | Plane | Split power plane |
5 | Plane | Ground |
6 | Signal | Bottom signal routing |
PCB stackup specifications for LPDDR2 interface are listed in Table 7-16.
NO. | PARAMETER | MIN | TYP | MAX | UNIT | |
---|---|---|---|---|---|---|
1 | PCB routing and plane layers | 6 | ||||
2 | Signal routing layers | 3 | ||||
3 | Full ground reference layers under LPDDR2 routing region(1) | 1 | ||||
4 | Full vdds_ddr power reference layers under the LPDDR2 routing region(1) | 1 | ||||
5 | Number of reference plane cuts allowed within LPDDR2 routing region(2) | 0 | ||||
6 | Number of layers between LPDDR2 routing layer and reference plane(3) | 0 | ||||
7 | PCB routing feature size | 4 | mils | |||
8 | PCB trace width, w | 4 | mils | |||
9 | PCB BGA escape via pad size(4) | 18 | 20 | mils | ||
10 | PCB BGA escape via hole size | 8 | mils | |||
11 | Single-ended impedance, Zo(5) | 50 | 75 | Ω | ||
12 | Impedance control(6)(7) | Zo-5 | Zo | Zo+5 | Ω |