Datasheet 23

Electrical Specifications

2.5 System Bus Signal Quality Specifications and

Measurement Guidelines

Overshoot (or undershoot) is the absolute value of the maximum voltage above the nominal

CTERM

voltage (or below GND), as shown in Table 2-3. The overshoot/undershoot specifications

limit transitions beyond V

CTERM

or GND due to the fast signal edge rates. The processor can be

permanently damaged by repeated overshoot or undershoot events on any input, output, or I/O

buffer if the charge is large enough (that is, if the overshoot/undershoot is great enough).

Determining the impact of an overshoot/undershoot condition requires knowledge of the

magnitude, the pulse duration, and the activity factor (AF).

2.5.1 Overshoot/Undershoot Magnitude

Magnitude describes the maximum potential difference between a signal and its voltage reference

level. For the Itanium 2 processor, both are referenced to GND as shown in Figure 2-3. It is

important to note that overshoot and undershoot conditions are separate and their impact must be

determined independently. Overshoot/undershoot magnitude levels must observe the absolute

maximum specifications listed in Table 2-13 through Table 2-21. These specifications must not be

violated at any time regardless of bus activity or system state. Within these specifications are

threshold levels that define different allowed pulse duration. Provided that the magnitude of the

overshoot/undershoot is within the absolute maximum specifications (1.8 V for overshoot and

–0.60 V for undershoot), the pulse magnitude, duration and activity factor must all be used to

determine if the overshoot/undershoot pulse is within specifications.

in, SMBus

SMBus Buffer DC Input Voltage with

Respect to GND

–0.1 6.0 V

in, AGTL+

AGTL+ Buffer DC Input Voltage with

Respect to GND

–0.1 1.9 V

CTERM

Any V

CTERM

Voltage with Respect to

GND

–0.1 1.9 V

in,TAP

TAP Buffer DC Input Voltage with

Respect to GND.

–0.1 2.1 V

NOTES:

1. Storage temperature is temperature in which the processor can be stored for up to one year.

2. Shipping temperature is temperature in which the processor can be shipped for up to 24 hours.

3. See Table 2-4 through Table 2-9 inclusive for operating voltages.

4. Parameters are from third party vendor specifications.

5. Maximum instantaneous voltage at receiver buffer input.

6. Specification includes V

in,AGTL+

and V

in,AGTL+ ASYNCHRONOUS

(AGTL+ asynchronous buffer DC input voltage with

respect to GND.

Table 2-12. Itanium

2 Processor Absolute Maximum Ratings (Sheet 2 of 2)

Symbol Parameter Minimum Maximum Unit Notes

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 107 108

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Table des matières

Contents

Safety Precautions

Locating the Units

(Continued)

INSTALLING THE UNIT

Selecting the Y-joint

Electrical Connections

COMPLETING THE INSTALLATION

Pump Down Procedure

Completing the Installation

Troubleshooting

INSTALLATION

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Intel Itanium 2 Processor Manuel d'utilisateur Page 23

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