Intel Pentium 4 User Manual

I/O Controller Hub 2
R
160 Intel
®
Pentium
®
4 Processor / Intel
®
850 Chipset Family Platform Design Guide
Figure 115. RTCRST External Circuit for the Intel
®
ICH2 RTC
VCC3_3SBY
Vcc RTC
1.0 µF
1 k
Ω
2.2 µF
8.2 k
Ω
RTCRST#
RTCRST
circuit
Diode /
battery circuit
RTC_RTCRESET_ext_circ
9.8.6 RTC Routing Guidelines
• All RTC OSC signals (RTCX1, RTCX2, VBIAS) should all be routed with trace lengths of
less than 1 inch, the shorter the better.
• Minimize the capacitance between RTCX1 and RTCX2 in the routing (optimal would be a
ground line between them).
• Put a ground plane under all of the external RTC circuitry.
• Do not route any switching signals under the external components (unless on the other side of
the ground plane).
9.8.7 VBIAS DC Voltage and Noise Measurements
• Steady state VBIAS will be a DC voltage of about 0.38 V ±0.06 V
• VBIAS will be “kicked” when the battery is inserted to about 0.7–1.0 V, but it will come back
to its DC value within a few ms
• Noise on VBIAS must be kept to a minimum, 200 mV or less.
• VBIAS is very sensitive and cannot be directly probed, it can be probed through a 0.01 µF
capacitor.
• Excess noise on VBIAS can cause the ICH2 internal oscillator to misbehave or even stop
completely.
• To minimize noise of VBIAS It is necessary to implement the routing guidelines described
above and the required external RTC circuitry as described in the Intel
®
82801BA I/O
Controller Hub 2 (ICH2) and Intel
®
82801BAM I/O Controller Hub 2 Mobile (ICH2-M)
Datasheet.

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