Datasheet

Electrical Characteristics
286 Datasheet
11.4.2 General DC Characteristics
Platform Reference Voltages at the top of Table 27 are specified at DC only. V
REF
measurements should be made with respect to the supply voltage.
Table 27. DC Characteristics
Symbol Parameter Min Nom Max Unit Notes
Reference Voltages
FSB_DVREF
FSB_ACCVREF
Host Data, Address, and
Common Clock Signal
Reference Voltages
0.666 x
VTT_FSB
–2%
0.666 x
VTT_FSB
0.666 x
VTT_FSB
+2%
V
FSB_SWING
Host Compensation
Reference Voltage
0.25 x VTT_FSB
–2%
0.25 x
VTT_FSB
0.25 x
VTT_FSB
+2%
V
CL_VREF
Controller Link Reference
Voltage
0.270 x
VCC_CL
0.279 x
VCC_CL
0.287 x
VCC_CL
V
DDR_VREF DDR2 Reference Voltage
0.49 x
VCC_DDR
0.50 x
VCC_DDR
0.51 x
VCC_DDR
V
Host Interface
V
IL_H
Host GTL+ Input Low Voltage -0.10 0
(0.666 x
VTT_FSB) –
0.1
V
V
IH_H
Host GTL+ Input High
Voltage
(0.666 x
VTT_FSB) + 0.1
VTT_FSB VTT_FSB + 0.1 V
V
OL_H
Host GTL+ Output Low
Voltage
——
(0.25 x
VTT_FSB) +
0.1
V
V
OH_H
Host GTL+ Output High
Voltage
VTT_FSB – 0.1 — VTT_FSB V
I
OL_H
Host GTL+ Output Low
Current
——
VTT_FSBmax *
(1–0.25) /
Rttmin
mA
Rtt
min
=
47.5 Ω
I
LEAK_H
Host GTL+ Input Leakage
Current
——45μA
V
OL
<
Vpad<
Vtt_FSB
C
PAD
Host GTL+ Input Capacitance 2.0 — 2.5 pF
C
PCKG
Host GTL+ Input Capacitance
(common clock)
0.90 — 2.5 pF
DDR2 System Memory Interface
V
IL(DC)
DDR2 Input Low Voltage — —
DDR_VREF
–
0.125
V
V
IH(DC)
DDR2 Input High Voltage
DDR_VREF
+
0.125
——V
V
IL(AC)
DDR2 Input Low Voltage — —
DDR_VREF
–
0.20
V
V
IH(AC)
DDR2 Input High Voltage
DDR_VREF
+
0.20
——V
V
OL
DDR2 Output Low Voltage — —
0.2 *
VCC_DDR
V1
V
OH
DDR2 Output High Voltage 0.8 * VCC_DDR — — V 1
I
Leak
Input Leakage Current — — ±20 µA 4
I
Leak
Input Leakage Current — — ±550 µA 5