ZHCS488K October 2011 – December 2018 AM3351 , AM3352 , AM3354 , AM3356 , AM3357 , AM3358 , AM3359
PRODUCTION DATA.
High-speed (HS) bypass capacitors are critical for proper LPDDR interface operation. It is particularly important to minimize the parasitic series inductance of the HS bypass capacitors, the AM335x device LPDDR power, and the AM335x device LPDDR ground connections. Table 7-39 contains the specification for the HS bypass capacitors as well as for the power connections on the PCB.
NO. | PARAMETER | MIN | MAX | UNIT |
---|---|---|---|---|
1 | HS bypass capacitor package size(1) | 0402 | 10 mils | |
2 | Distance from HS bypass capacitor to device being bypassed | 250 | mils | |
3 | Number of connection vias for each HS bypass capacitor(2) | 2 | Vias | |
4 | Trace length from bypass capacitor contact to connection via | 30 | mils | |
5 | Number of connection vias for each AM335x VDDS_DDR and VSS terminal | 1 | Vias | |
6 | Trace length from AM335x VDDS_DDR and VSS terminal to connection via | 35 | mils | |
7 | Number of connection vias for each LPDDR device power and ground terminal | 1 | Vias | |
8 | Trace length from LPDDR device power and ground terminal to connection via | 35 | mils | |
9 | AM335x VDDS_DDR HS bypass capacitor count(3) | 10 | Devices | |
10 | AM335x VDDS_DDR HS bypass capacitor total capacitance | 0.6 | μF | |
11 | LPDDR device HS bypass capacitor count(3)(4) | 8 | Devices | |
12 | LPDDR device HS bypass capacitor total capacitance(4) | 0.4 | μF |