Datasheet

Intel® Xeon™ Processor with 512 KB L2 Cache
18 Datasheet
The AC low-pass requirements, with input at V
CC
and output measured across the capacitor (C
A
or
C
IO
in Figure 1), is as follows:
• < 0.2 dB gain in pass band
• < 0.5 dB attenuation in pass band < 1 Hz (see DC drop in next set of requirements)
• > 34 dB attenuation from 1 MHz to 66 MHz
• > 28 dB attenuation from 66 MHz to core frequency
The filter requirements are illustrated in Figure 2. For recommendations on implementing the filter
refer to the appropriate platform design guidelines.
Figure 1. Typical V
CCIOPLL
, V
CCA
and V
SSA
Power Distribution
VCC
VCCA
VSSA
VCCIOPLL
L1/L2
L1/L2
C
C
Processor
PLL
R-Socket
R-Trace
R-Socket
R-Socket
R-Trace
Processor interposer "pin"
Baseboard via that connects
filter to VCC plane
Trace < 0.02 Ω
Socket pin