PRIXP425BD datasheet(84/112 Pages) INTEL

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Intel® IXP42X Product Line and IXC1100 Control Plane Processor

Electrical Specifications

Datasheet

5.5

AC Specifications

5.5.1

Clock Signal Timings

5.5.1.1

Processor Clock Timings

NOTES:

1. This value could be an oscillator input or a series resonant frequency from a crystal. If used as an oscillator

input, tie to the crystal input pin and leave the crystal output pin disconnected.

2. Use the component values recommended by the crystal manufacturer.

3. This parameter applies when driving the clock input with an oscillator.

4. The reference-clock input slope should not exceed more than 2.5 V/nS to ensure proper PLL operation

Table 38.

Device Clock Timings (Oscillator Reference)

Symbol

Parameter

Min.

Nom.

Max.

Units

Notes

VIH

Input-high voltage

2.0

VIL

Input-low voltage

0.8

TFREQUENCY

Clock frequency for IXP42X product line

and IXC1100 control plane processors

crystal or oscillator.

33.33

MHz

1, 4

FREQUENCY

Clock tolerance over -40º C to 85º C.

-50

ppm

CIN

Pin capacitance of IXP42X product line and

IXC1100 control plane processors

’ inputs.

5pF

CSHUNT

CSHUNT is a crystal parameter sometimes

referred to as the holder capacitance.

Load capacitance

TDC

Duty cycle

Table 39.

Device Clock Timings (Crystal Reference) (Sheet 1 of 2)

Symbol

Parameter

Min.

Nom.

Max.

Units

Notes

VIH

Input-high voltage

1.9

VIL

Input-low voltage

1.6

TFREQUENCY

Clock frequency for IXP42X product

line and IXC1100 control plane

processors crystal or oscillator.

33.33

MHz

1, 4

FREQUENCY

Clock tolerance over -40º C to 85º C.

-50

ppm

ESR

Equivalent Series Resistance

Ω

CIN

Pin capacitance of IXP42X product line

and IXC1100 control plane processors

’

inputs.

5pF

CSHUNT

CSHUNT is a crystal parameter

sometimes referred to as the holder

capacitance.

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