20 Datasheet
Electrical Specifications
Table 2-10 through Table 2-11 list the AC specifications for the Itanium 2 processor’s clock and
SMBus (timing diagrams begin with Figure 2-1). The Itanium 2 processor uses a differential HSTL
clocking scheme with a frequency of 200, 266 or 333 MHz. The SMBus is a subset of the I2C*
interface which supports operation of up to 100 kHz.
Table 2-8. SMBus DC Specifications
Symbol Parameter Minimum Typ Maximum Unit Notes
3.3V V
CC
for the System Management
Components
3.14 3.3 3.47 V 3.3V ±5%
V
IL
Input Low Voltage –0.3 0.3*3.3V V
V
IH
Input High Voltage 2.31 3.47 V Max =
3.3 +5%
Min +
0.7*3.3V
V
OL
Output Low Voltage 0.4 V
I
3.3V
3.3V Supply Current 5.0 30.0 mA
I
OL
Output Low Current 3 mA
1
NOTES:
1. The value specified for I
OL
applies to all signals except for THRMALERT#.
I
OL2
Output Low Current 6 mA
2
2. The value specified for I
OL2
applies only to THRMALERT# which is an open drain signal.
I
LI
Input Leakage Current 10 µA
I
LO
Output Leakage Current 10 µA
Table 2-9. LVTTL Signal DC Specifications
Symbol Parameter Minimum Maximum Unit Notes
V
IL
Input Low Voltage 0.8 V
V
IH
Input High Voltage 2.0 3.63 V
V
OL
Output Low Voltage 0.4 V
V
OH
Output High Voltage 2.4 V
Table 2-10. System Bus Clock Differential HSTL AC Specifications (Sheet 1 of 2)
Symbol Parameter
System
Bus
Clock
(MHz)
Minimum Typ Maximum Unit Figure Notes
T
period
BCLKp Period 200 5.0 ns Figure 2-1
T
skew
System Clock Skew 200 100 ps
1
f
BCLK
BCLKp Frequency 200 200 200 MHz Figure 2-1
2
T
jitter
BCLKp Input Jitter 200 100 ps Figure 2-1
3
T
high
BCLKp High Time 200 2.25 2.5 2.75 ns Figure 2-1
4
T
low
BCLKp Low Time 200 2.25 2.5 2.75 ns Figure 2-1
4
T
period
BCLKp Period 266 3.75 ns Figure 2-1
T
skew
System Clock Skew 266 60 ps
5
f
BCLK
BCLKp Frequency 266 266 266 MHz Figure 2-1
2
T
jitter
BCLKp Input Jitter 266 50 ps Figure 2-1
3
T
high
BCLKp High Time 266 1.69 1.88 2.06 ns Figure 2-1
4
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