Datasheet

Intel
®
Xeon
®
Processor C5500/C3500 Series
January 2010 Datasheet, Volume 1
Order Number: 323103-001 487
Electrical Specifications
Table 155 outlines the required voltage supplies necessary to support Intel
®
Xeon
®
processor C5500/C3500 series.
Note:
1. See Table 162 for voltage and current specifications.
Further platform and processor power delivery details are in the Picket Post: Intel
®
Xeon
®
Processor C5500/C3500 Series with the Intel
®
3420 Chipset Platform Design
Guide (PDG).
13.1.10.1 Power and Ground Lands
For clean on-chip power distribution, processors include lands for all required voltage
supplies.
The processor has V
CC,
V
TT,
V
DDQ,
V
CCPLL,
and
V
SS
inputs for on-chip power distribution.
All power lands must be connected to their respective processor power planes, while all
V
SS
lands must be connected to the system ground plane. See the Picket Post: Intel
®
Xeon
®
Processor C5500/C3500 Series with the Intel
®
3420 Chipset Platform Design
Guide (PDG) for decoupling, voltage plane and routing guidelines for each power supply
voltage.
13.1.10.2 Decoupling Guidelines
Due to its large number of transistors and high internal clock speeds, the Intel
®
Xeon
®
processor C5500/C3500 series is capable of generating large current swings between
low and full power states. This may cause voltages on power planes to sag below their
minimum values if bulk decoupling is not adequate. Larger bulk storage (C
BULK
), such
as electrolytic capacitors, supply current during longer lasting changes in current
demand, for example coming out of an idle condition. Similarly, they act as a storage
well for current when entering an idle condition from a running condition. Care must be
taken in the board design to ensure that the voltages provided to the processor remain
within the specifications listed in Table 162. Failure to do so can result in timing
violations or reduced lifetime of the processor. For further information, see the Picket
Post: Intel
®
Xeon
®
Processor C5500/C3500 Series with the Intel
®
3420 Chipset
Platform Design Guide (PDG).
13.1.10.3 Processor V
CC
Voltage Identification (VID) Signals
The Voltage Identification (VID) specification for the V
CC
voltage is defined by the
Voltage Regulator Module (VRM) and Enterprise Voltage Regulator-Down (EVRD) 11.1
Design Guidelines, Revision 1.5. The voltage set by the VID signals is the maximum
reference voltage regulator (VR) output to be delivered to the processor V
CC
lands. VID
signals are CMOS push/pull outputs. See Table 172 for the DC specifications for these
and other processor signals.
Table 155. Processor Power Supply Voltages
1
Power Rail Nominal Voltage Notes
V
CC
See Table 163;
Figure 86
Each processor includes a dedicated VR11.1 regulator.
V
CCPLL
1.80 V Each processor includes dedicated V
CCPLL
and PLL circuits.
V
DDQ
1.50 V Each processor and DDR3 stack shares a dedicated voltage regulator.
V
TTA
, V
TTD
See Table 173
Each processor includes a dedicated VR11.0 regulator.
V
TT
= V
TTA
= V
TTD
; P1V1_Vtt is VID[4:2] controlled,
VID range is 1.0255-1.2000V. The tolerance is +/- 2% at the processor
pin. (This assumes that the filter circuit described in the Picket Post:
Intel
®
Xeon
®
Processor C5500/C3500 Series with the Intel
®
3420
Chipset Platform Design Guide (PDG) is used.)