Datasheet

Electrical Characteristics
R
124 Intel
®
82845 MCH for DDR Datasheet
Symbol Signal
Group
Parameter Min Nom Max Unit Notes
I
LEAK_HI
(i) Hub Interface Input
Leakage Current
-150, +15 µA 0<Vin<
VCC1_8
C
IN_HI
(i) Hub Interface Input
Capacitance
2.58 3.17 pF
Clocks, Reset, and Miscellaneous Signals
V
IL
(o) Input Low Voltage HIREF – 0.15 V
V
IH
(o) Input High Voltage HIREF + 0.15 V
V
OL
(o) Output Low Voltage 0.1 x VCC1_8 V I
OL
= 1 mA
V
OH
(o) Output High Voltage 0.9 x VCC1_8 V I
OH
= 1 mA
I
OL
(o) Output Low Current 1 mA @V
OL_HI
max
I
OH
(o) Output High Current -1 mA @V
OH_HI
max
I
LEAK
(o) Input Leakage Current –150, +15 µA 0<Vin<VCC1_8
C
IN
(o) Input Capacitance 2.58 3.17 pF
V
IL
(p) Input Low Voltage 0.8 V
V
IH
(p) Input High Voltage 2.0 V
I
LEAK
(p) Input Leakage Current ±100 µA 0<Vin<VCC3_3
C
IN
(p) Input Capacitance 4.690 5.370 pF
V
IL
(q) Input Low Voltage 0 V
V
IH
(q) Input High Voltage 0.660 0.710 0.850 V
V
CROSS
(q) Crossing Voltage 0.45x(V
IH
– V
IL
) 0.5x(V
IH
– V
IL
) 0.55x(V
IH
– V
IL
) V
C
IN
(q) Input Capacitance 0.94 1.1 pF
V
IL
(v) Input Low Voltage 0.8 V
V
IH
(v) Input High Voltage 2.4 V
C
IN
(v) Input Capacitance 1.2 1.4 pF
NOTES:
1. Determined with 0.75x MCH DDR Buffer Strength Settings