Intel® 945G/945GZ/945GC/ 945P/945PL Express Chipset Family ...

11.3 DC Characteristics
Table 11-5. DC Characteristics
Symbol Signal
Group
I/O Buffer Supply Voltage (AC Noise not included unless noted)
Electrical Characteristics
Parameter Min Nom Max Unit Notes
VCCSM (q) DDR2 I/O Supply Voltage 1.7 1.8 1.9 V 4
VCCA_SMPLL (r) DDR2 I/O PLL Analog Supply
Voltage
VCC_EXP (p) SDVO, PCI-Express Supply
Voltage
VTT (o) System Bus Input Supply
Voltage
1.425 1.5 1.575 V
1.425 1.5 1.575 V
1.14 1.2 1.26 V
VCC (s) GMCH Core Supply Voltage 1.425 1.5 1.575 V 11
VCC2 (t) CMOS Supply Voltage 2.375 2.5 2.625 V
VCCA_DAC (u) CRT Display DAC Supply
Voltage
VCCA_HPLL,
VCCA_EXPPLL
,
VCCA_DPLLA,
VCCA_DPLLB
Reference Voltages
(v) Various PLLs’ Analog Supply
Voltages
HVREF (d) Host Address, Data, and
Common Clock Signal
Reference Voltage
HSWING (d) Host Compensation Reference
Voltage
2.375 2.5 2.625 V
1.425 1.5 1.575 V
0.63 x VTT –2% 0.63 x VTT 0.63 x VTT +2% V
0.22 x VTT –2% 0.22 x VTT 0.22 x VTT+2% V
SMVREF (j) DDR2 Reference Voltage 0.49 x VCCSM 0.50 x VCCSM 0.51 x VCCSM V
Host Interface
VIL_H (a, c, c1) Host GTL+ Input Low Voltage -0.10 0 (0.63 x VTT) – 0.1 V
VIH_H (a, c, c1) Host GTL+ Input High Voltage (0.63 x
VTT)+0.1
VOL_H (a, b) Host GTL+ Output Low
Voltage
VOH_H (a, b) Host GTL+ Output High
Voltage
IOL_H (a, b) Host GTL+ Output Low
Current
ILEAK_H (a, c, c1) Host GTL+ Input Leakage
Current
VTT VTT +0.1 V
— — (0.22 x VTT)+0.1 V
VTT – 0.1 — VTT V
— — VTTmax *(1–0.22) /
Rttmin
mA Rttmin = 54 �
— — 20 �A VOL