Table 76. Mch System Memory Supply Voltage And Current Specification - Intel 855PM Design Manual

Platform Power Delivery Guidelines

Table 76. MCH System Memory Supply Voltage and Current Specification

Name
Purpose
Definition
Voltage Nominal (V)
Tolerance (+/-%)
Tolerance (+/-V)
Max Absolute Spec
Value (V)
Min Absolute Spec
Value (V)
Max Relative Spec
(calculated from
measured "VCCSM"
value)
Min Relative Spec
(calculated from
measured "VCCSM"
value)
Absolute Maximum
Current Requirements
(A)
258
"VCCSM" "SMVREF"
MCH DDR
Supply Voltage MCH Reference Supply
(I/O), Static Voltage, Static
VCCSM SMVREF = (VCCSM/2) ± 2%
2.500 1.250
5.0% 2.0%
0.125 0.025
2.625 1.339
2.375 1.164
NA (measured VCCSM/2) + 2%
NA (measured VCCSM/2) - 2%
I (max) I
VCCSM SMVREF
1.900 0.00005 (50uA)
"VTT"=
"SMRCOMP"
SMRCOMP
Termination Supply
Voltage, Static
VTT = ("Vref") ±
0.040 V
1.250
3.2%
0.040
1.440
1.060
(measured Vref) +
0.04 V
(measured Vref) -
0.040 V
(max) I (max)
TTRC
0.080 (80mA)
®
Intel 855PM Chipset Platform Design Guide
R
Description
(((2.5 V ± 5%)/2) ± 0.050
V) ± 0.040)
(((2.5 V + 5%)/2) + 0.050
V) + 0.040)
(((2.5 V - 5%)/2) - 0.050
V) - 0.040)