ZHCSE24B April 2015 – April 2019 AM3358-EP
PRODUCTION DATA.
HS bypass capacitors are critical for proper DDR2 interface operation. It is particularly important to minimize the parasitic series inductance of the HS bypass capacitors, the AM3358-EP device DDR2 power, and the AM3358-EP device DDR2 ground connections. Table 7-51 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 AM3358-EP VDDS_DDR and VSS terminal | 1 | vias | |
6 | Trace length from AM3358-EP VDDS_DDR and VSS terminal to connection via | 35 | mils | |
7 | Number of connection vias for each DDR2 device power and ground terminal | 1 | vias | |
8 | Trace length from DDR2 device power and ground terminal to connection via | 35 | mils | |
9 | AM3358-EP VDDS_DDR HS bypass capacitor count(3) | 10 | devices | |
10 | AM3358-EP VDDS_DDR HS bypass capacitor total capacitance | 0.6 | μF | |
11 | DDR2 device HS bypass capacitor count(3)(4) | 8 | devices | |
12 | DDR2 device HS bypass capacitor total capacitance(4) | 0.4 | μF |