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Electrical Characteristics
R
122 Intel
®
82845 MCH for SDR Datasheet
6.4 DC Characteristics
Table 21. DC Characteristics
Symbol Signal
Group
Parameter Min Typ Max Unit Notes
I/O Buffer Supply Voltage
VCCSM (u) PC133 SDRAM I/O Voltage 3.135 3.3 3.465 V
VCC1_8 (t) 1.8V I/O Supply Voltage 1.71 1.8 1.89 V
VCC1_5 (s) Core and AGP Voltage 1.425 1.5 1.575 V
VTT (r) Host AGTL+ Termination Voltage N/A N/A 1.75 V
Reference Voltages
HVREF (d) Host Address and Data Reference
Voltage
(2/3 x VTT) – 2% 2/3 x VTT (2/3 x VTT) + 2% V
HSWING (d) Host Compensation Reference
Voltage
(1/3 x VTT) – 2% 1/3 x VTT (1/3 x VTT) + 2% V
HI_REF (j) Hub Interface Reference Voltage 0.48 x VCC1_8 1/2 x VCC1_8 0.52 x VCC1_8 V
SDREF (n) SDRAM Reference Voltage 0.49 x VCCSM 1/2 x VCCSM 0.51 x VCCSM V
AGPREF (h) AGP Reference Voltage 0.48 x VCC1_5 1/2 x VCC1_5 0.52 x VCC1_5 V
System Bus Interface
V
IL
(a,c) Host AGTL+ Input Low Voltage (2/3 x VTT) – 0.1
V
V
IH
(a,c) Host AGTL+ Input High Voltage (2/3 x VTT) + 0.1
V
V
OL
(a,b) Host AGTL+ Output Low Voltage (1/3 x VTT) + 0.1 V
V
OH
(a,b) Host AGTL+ Output High Voltage VTT-0.1 V
I
OL
(a,b) Host AGTL+ Output Low Current VTT
max
/ 0.75Rtt mA Rtt
min
= 45 Ω
Rtt
typ
= 50 Ω
Rtt
max
= 55 Ω
I
LEAK
(a,c) Host AGTL+ Input Leakage
Current
±15 µA V
OL
<Vpad<
VTT
C
PAD
(a,c) Host AGTL+ Input Capacitance 1.0 pF
3.3 V Interface
V
IL
(k,m,p) Input Low Voltage SDREF – 2.0 V
V
IH
(k,m,p) Input High Voltage SDREF + 2.0 V
V
OL
(k,l) Output Low Voltage 0.4 V
V
OH
(k,l) Output High Voltage 2.4 V
I
OL
(k,l) Output Low Current 4 mA @V
OL_S
max
I
OH
(k,l) Output High Current -4 mA @V
OH_S
max
I
LEAK
(k,m,p) Input Leakage Current ±100 µA 0<Vin<VCC3_3