Intel 4 2.26 GHz BX80532PE2260D User Manual
Product codes
BX80532PE2260D
18
Intel
®
Pentium
®
4 Processor on 0.13 Micron Process Datasheet
Electrical Specifications
2.4.1
Phase Lock Loop (PLL) Power and Filter
V
CCA
and V
CCIOPLL
are power sources required by the PLL clock generators on the Pentium 4
processor on 0.13 micron process. Since these PLLs are analog, they require quiet power supplies
for minimum jitter. Jitter is detrimental to the system; it degrades external I/O timings as well as
internal core timings (i.e., maximum frequency). To prevent this degradation, these supplies must
be low pass filtered from V
internal core timings (i.e., maximum frequency). To prevent this degradation, these supplies must
be low pass filtered from V
CC
. A typical filter topology is shown in
The AC low-pass requirements, with input at V
CC
and output measured across the capacitor
(C
A
or C
IO
), is as follows:
•
< 0.2 dB gain in pass band
•
< 0.5 dB attenuation in pass band < 1 Hz
•
> 34 dB attenuation from 1 MHz to 66 MHz
•
> 28 dB attenuation from 66 MHz to core frequency
Refer to the appropriate platform design guide for recommendations on implementing the filter.
Table 2-2. Voltage Identification Definition
Processor Pins
V
CC_MAX
VID4
VID3
VID2
VID1
VID0
1
1
1
1
1
VRM output off
1
1
1
1
0
1.100
1
1
1
0
1
1.125
1
1
1
0
0
1.150
1
1
0
1
1
1.175
1
1
0
1
0
1.200
1
1
0
0
1
1.225
1
1
0
0
0
1.250
1
0
1
1
1
1.275
1
0
1
1
0
1.300
1
0
1
0
1
1.325
1
0
1
0
0
1.350
1
0
0
1
1
1.375
1
0
0
1
0
1.400
1
0
0
0
1
1.425
1
0
0
0
0
1.450
0
1
1
1
1
1.475
0
1
1
1
0
1.500
0
1
1
0
1
1.525
0
1
1
0
0
1.550
0
1
0
1
1
1.575
0
1
0
1
0
1.600