82845PE Datasheet, PDF (148/176 Pages) Intel Corporation – 82845GE Graphics and Memory Controller Hub (GMCH) and 82845PE Memory Controller Hub (MCH)

Electrical Characteristics
Table 6-6. DC Characteristics (Sheet 2 of 2)
Symbol
Signal
Group
Parameter
Min
Nom
Max
Unit
Notes
3.3 V Synchronization Signals: Functional Operating Range (VCC=3.3 V ± 5%)
V_IH
(t) Output High Voltage
2.4
V_IL
(t) Output Low Voltage
0.0
I_OH
(t) Output High Current
-8
I_OL
(t) Output Low Current
8
Clocks and Miscellaneous Signals
V_IL
V_IH
V_OL
V_OH
I_OL
I_OH
I_LEAK
C_IN
V_Cross(Abs)
V_Cross(Rel)
(y) 3.3 V CMOS Input Low Voltage
(y) 3.3 V CMOS Input High Voltage
(y) 3.3 V CMOS Output Low Voltage
(y) 3.3 V CMOS Output High Voltage
(y) 3.3 V CMOS Output Low Current
(y) 3.3 V CMOS Output High Current
(y) 3.3 V CMOS Input Leakage Current
(y) 3.3 V CMOS Input Capacitance
(j) Absolute Crossing Voltage
(j) Relative Crossing Voltage
2.0
2.4
-4
0.250
Note 5
3.465
V
0.5
V
MA
mA
0.8
0.4
4
±15
5.5
0.550
Note 5
V
V
V
V
mA @V_OL max
mA @V_OH min
µA 0<Vin<VCC3
pF F_C=1 MHz
V 1,2,4,5
V 1,2,3,4,5
NOTES:
1. Crossing voltage is defined as the instantaneous voltage value when the rising edge of HCLKP equals the
falling edge of HCLKN.
2. V_IH(Ave) is the statistical average of the V_IH measured by the oscilloscope.
3. V_IH(Ave) can be measured directly using “Vtop” on Agilent* scopes and “High” on Tektronix* scopes.
4. The crossing point must meet the absolute and relative crossing point specifications simultaneously.
5. V_Cross(Rel) Maximum = 0.550+0.5(V_IH(Ave)–0.71); V_Cross(Rel) Minimum = 0.250+0.5(V_IH(Ave)–0.71). See
Figure 6-1.
Figure 6-1. System Bus HCLKP/N VCROSS Range
550
Vcross(rel) Max
500
450
400
350
Vcross Range
For VHigh < 0.71V
Vcross Range
For VHigh > 0.71V
300
Vcross(rel) Min
250
200
625 650 675 700 725 750 775 800 825 850
VHigh Average (mV) (Measured)
Vcross(rel) Max = 0.5 (Vhavg - 0.710) + .550
Vcross(rel) Min = 0.5 (Vhavg - 0.710) + .250
148
Intel^® 82845GE/82845PE Datasheet