Intel Pentium 4 User Manual

Power Distribution Guidelines
R
Intel
®
Pentium
®
4 Processor / Intel
®
850 Chipset Family Platform Design Guide 235
12.5 Intel
®
850 Chipset Power Sequencing Requirements
The Intel
®
850 chipset needs the following power supplies for operation – VCC1_8, VDDQ and
VTT.
To avoid forward-biasing the ESD protection-diodes from the IO to Core power supplies, it is
necessary that the VCC1_8 power supply ramp up ahead (See Figure 178) of the VDDQ and VTT
power supplies. For the same reason, it is necessary to have the VCC1_8 power supply ramp down
later than the VDDQ and VTT power supplies. If this cannot be guaranteed, it is important that the
VCC1_8 power supply lag (see Figure 179) the I/O supplies by no greater than 1.0 V. There are
no dependencies between VDDQ and VTT supplies.
Figure 178. Desired Mode of Power Sequencing
Time
Voltage
VDDQ/VTT
VCC1_8
Figure 179. Optional Mode of Power Sequencing
1.0V 1.0V
Time
Voltage
VDDQ/VTT
VCC1_8

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