Datasheet

Intel
®
E8870 Scalable Node Controller (SNC) Datasheet 9-9
Electrical Specifications
9.7.2 AC Specifications
Figure 9-1. TAP DC Thresholds
Table 9-16. SMBus DC Parameters
a,b
a. All specifications are at the pin of the package.
b. Parameters apply to SMBus inputs, outputs and I/O buffers.
Symbol Parameter Mi Max Unit Notes
Vil Input Low Voltage –0.5 0.8 V
Vih Input High Voltage 2.1 3.47 V
Vol Output Low Voltage 0.4 V
c
c. At Vol max, Iol = 4 mA.
Ili Input Leakage Current 50 µA
Ipullup Current through Pull-up Resistor 4.0 mA
Cin Input Capacitance 10 pF
Vnoise Signal Noise Immunity 300 mV
d,e
d. At 1 MHz to 5 MHz range.
e. Peak-to-peak.
Table 9-17. SMBus Signal Group AC Specifications
a
a. All AC timings for the SMBus signals are referenced to the SM_CLK signal at 0.5 • SM_VCC at the package pins. All SMBus
signal timings (SM_DAT, SM_ALERT#, etc.) are referenced at 0.5 • SM_VCC at the package pins.
Symbol Parameter Minimum Maximum Unit Figure Notes
f
smb
Operating Frequency 10 100 kHz
T60
SMBus Output Valid
Delay
1.0 us 9-2
T61 SMBus Input Setup Time 250 ns 9-2
T62 SMBus Input Hold Time 300 ns 9-2
T
r
Clock/Data Rise Time 1000 ns
b
b. T
r
= (V
il,max
-0.15) to (V
ih,min
+0.15)
T
f
Clock/Data Fall Time 300 ns
c
c. T
f
= (V
ih,min
+0.15) to (V
il,max
-0.15)
Bus Free Time 4.70 µs
d
d. Minimum time allowed between request cycles.
TAP
Signal
V
T
+
(max)
V
T
+
(min)
V
T
-
(max)
V
T
-
(min)
V
H (min)
V
H (min)