Intel Pentium 4 User Manual

Power Distribution Guidelines
R
232 Intel
®
Pentium
®
4 Processor / Intel
®
850 Chipset Family Platform Design Guide
Simulations and validations indicate that L = 3.3 nH and C
1
= 3.3 µF forms an adequate inductor-
capacitor filter. The filter must be located within 2-inches the device and the layout of VccRAC
connections should follow high-speed design practices.
In addition to the low-pass filter, the RAC requires local decoupling capacitors. These decoupling
capacitors should be located close to the RAC pins to control self-induced RAC noise. For the
inductor-capacitor filter, two to three 0.1 µF capacitors (C
2
) for both RACs should provide
adequate decoupling between VccRAC and VSS.
The inductor-capacitor filter and its associated decoupling capacitors can be implemented using
0805 size components.
Figure 173. Ferrite Bead Filter Circuit
1.8 V
Bead
C1
C3
Vcc
Core
VccRAC
MCH
Ferrite_Bead_Filter
C2
As an alternate solution, a 10 Ω (@ 100 MHz) and 10 µF forms an adequate ferrite bead-capacitor
filter. The filter must be located within 2-inches the device and the layout of VccRAC connections
should follow high-speed design practices.
In addition to the ferrite bead filter, the RAC requires local decoupling capacitors. These
decoupling capacitors should be located close to the RAC pins to control self-induced RAC noise.
For the ferrite bead filter, use a minimum number of two 0.1 µF capacitors (C
2
) per RAC, and a
minimum of one 1.0 µF capacitor (C
3
) for both RACs should be sufficient. The layout of the
capacitor connections should follow high-speed design practices.
The ferrite bead filter and its associated decoupling capacitors can also be implemented using
0805 components except for the 10 µF capacitor, which is a 1206 size component.
Table 56. Intel
®
MCH 1.8 V RAC Pinout
Intel
®
MCH 1.8 V RAC
Pinout
Location
Channel A Channel B
T22 C16
N22 F15
J22 F14
J20 C13
R19 E9
Ball
P19 C9

Intel Pentium 4 Specifications

General

Architecture	x86
Core Count	1
Microarchitecture	NetBurst
Manufacturer	Intel
Core Names	Willamette, Northwood, Prescott, Cedar Mill
Virtualization Technology	No
Release Date	November 20, 2000
Clock Speed	1.3 GHz to 3.8 GHz
FSB Speed	400 MHz to 1066 MHz
Socket	Socket 423, Socket 478, LGA 775
Introduced	2000
Product Line	Pentium
Front Side Bus	400 MHz to 1066 MHz
Hyper-Threading	Yes (Prescott and later)
64-bit Support	Yes (Prescott and later)
Instruction Set	MMX, SSE, SSE2, SSE3
Discontinued	2008
Process Technology	180 nm, 130 nm, 90 nm, 65 nm
L2 Cache	256 KB, 512 KB, 1 MB, 2 MB
Lithography	180 nm, 130 nm, 90 nm, 65 nm
L1 Cache	8 KB