450 datasheet(25/100 Pages) INTEL

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Datasheet

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:

Unless otherwise noted, all specifications in this table apply to all processor frequencies.

VIL is defined as the voltage range at a receiving agent that will be interpreted as a logical

low value.

VIH is defined as the voltage range at a receiving agent that will be interpreted as a logical

high value.

VIH and VOH may experience excursions above VTT. However, input signal drivers must

comply with the signal quality specifications.

The VTT referred to in these specifications is the instantaneous VTT.

Leakage to VSS with land held at VTT.

Leakage to VTT with land held at 300 mV.

NOTES:

Unless otherwise noted, all specifications in this table apply to all processor frequencies.

Measured at VTT * 0.2.

For Vin between 0 and VOH

Table 11.

GTL+ Signal Group DC Specifications

Symbol

Parameter

Min

Max

Unit

Notes1

VIL

Input Low Voltage

-0.10

GTLREF – 0.10

2, 5

VIH

Input High Voltage

GTLREF + 0.10

VTT + 0.10

3, 4, 5

VOH

Output High Voltage

VTT – 0.10

VTT

V4, 5

IOL

Output Low Current

N/A

VTT_MAX/

[(RTT_MIN)+(RON_MIN)]

A-

ILI

Input Leakage Current

N/A

± 100

µA

ILO

Output Leakage Current

N/A

± 100

µA

RON

Buffer On Resistance

Table 12.

Open Drain and TAP Output Signal Group DC Specifications

Symbol

Parameter

Min

Max

Unit

Notes1

VOL

Output Low Voltage

0.20

IOL

Output Low Current

Output Leakage Current

N/A

± 200

µA

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