Electrical Characteristics
R
Intel
®
82925X/82925XE MCH Datasheet 189
11.4 General DC Characteristics
Table 11-5. DC Characteristics
Symbol
Signal
Group
Parameter Min Nom Max Unit Notes
3
I/O Buffer Supply Voltage (AC noise not included)
VCCSM
(DDR2)
(t) DDR2 I/O Supply Voltage 1.7 1.8 1.9 V
VCCA_SMPLL
(DDR2)
(v) DDR2 I/O PLL Analog
Supply Voltage
1.425 1.5 1.575 V
VCC_EXP (r) PCI Express* Supply
Voltage
1.425 1.5 1.575 V
VTT (q) System Bus Input Supply
Voltage
1.09 1.2 1.26 V
VCC (w) MCH Core Supply
Voltage
1.425 1.5 1.575 V
VCC2 (x) CMOS Supply Voltage 2.375 2.5 2.625 V
VCCA_HPLL,
VCCA_EXPPLL
(z) Various PLL’s Analog
Supply Voltages
1.425 1.5 1.575 V
Reference Voltages
HVREF (d) Host Address, Data, and
Common Clock Signal
Reference Voltage
2/3 x V
TT
– 2% 2/3 x V
TT
2/3 x V
TT
+ 2%
V
HSWING (d) Host Compensation
Reference Voltage
1/4 x V
TT
–2% 1/4 x VTT 1/4 x VTT + 2% V
SMVREF
(DDR2)
(m) DDR2 Reference Voltage 0.49 x
VCCSM
(DDR2)
0.50 x VCCSM
(DDR2)
0.51 x VCCSM
(DDR2)
V
Host Interface
V
IL_H
(a, c) Host GTL+ Input Low
Voltage
–0.10 0 (2/3 x V
TT
)
– 0.1
V
V
IH_H
(a, c) Host GTL+ Input High
Voltage
(2/3 x V
TT
) +
0.1
V
TT
V
TT
+ 0.1 V
V
OL_H
(a, b) Host GTL+ Output Low
Voltage
— — (0.25 x V
TT
) + 0.1 V
V
OH_H
(a, b) Host GTL+ Output High
Voltage
V
TT
– 0.1 — V
TT
V
I
OL_H
(a, b) Host GTL+ Output Low
Current
— — VTT
max
/
(1–0.25)Rtt
min
mA Rtt
min
=
54 Ω
I
LEAK_H
(a, c) Host GTL+ Input
Leakage Current
— — 20 µA V
OL
<
Vpad <
V
TT