Datasheet

Datasheet 25
Electrical Specifications
2.7.2 CMOS and Open Drain Signals
Legacy input signals such as A20M#, IGNNE#, INIT#, SMI#, and STPCLK# use CMOS
input buffers. All of the CMOS and Open Drain signals are required to be asserted/de-
asserted for at least four BCLKs for the processor to recognize the proper signal state.
See Section 2.7.3 for the DC specifications. See Section 6.2 for additional timing
requirements for entering and leaving the low power states.
2.7.3 Processor DC Specifications
The processor DC specifications in this section are defined at the processor
core (pads) unless otherwise stated. All specifications apply to all frequencies
and cache sizes unless otherwise stated.
NOTES:
1. Unless otherwise noted, all specifications in this table apply to all processor frequencies.
2. V
IL
is defined as the voltage range at a receiving agent that will be interpreted as a logical
low value.
3. V
IH
is defined as the voltage range at a receiving agent that will be interpreted as a logical
high value.
4. V
IH
and V
OH
may experience excursions above V
TT
. However, input signal drivers must
comply with the signal quality specifications.
5. The V
TT
referred to in these specifications is the instantaneous V
TT
.
6. Leakage to V
SS
with land held at V
TT
.
7. Leakage to V
TT
with land held at 300 mV.
NOTES:
1. Unless otherwise noted, all specifications in this table apply to all processor frequencies.
2. Measured at V
TT
* 0.2.
3. For Vin between 0 and V
OH
Table 11. GTL+ Signal Group DC Specifications
Symbol Parameter Min Max Unit Notes
1
V
IL
Input Low Voltage -0.10 GTLREF – 0.10 V 2, 5
V
IH
Input High Voltage GTLREF + 0.10 V
TT
+ 0.10 V 3, 4, 5
V
OH
Output High Voltage V
TT
– 0.10 V
TT
V4, 5
I
OL
Output Low Current N/A
V
TT_MAX
/
[(R
TT_MIN
)+(R
ON_MIN
)]
A-
I
LI
Input Leakage Current N/A ± 100 µA 6
I
LO
Output Leakage Current N/A ± 100 µA 7
R
ON
Buffer On Resistance 10 13 Ω
Table 12. Open Drain and TAP Output Signal Group DC Specifications
Symbol Parameter Min Max Unit Notes
1
V
OL
Output Low Voltage 0 0.20 V -
I
OL
Output Low Current 16 50 mA 2
I
LO
Output Leakage Current N/A ± 200 µA 3