gwixp425bdt Intel Corporation, gwixp425bdt Datasheet - Page 92

• Manufacturer Part Number: gwixp425bdt
• Description: Intel Xp42x Product Line Of Network Processors And Ixc1100 Control Plane Processor
• Manufacturer: Intel Corporation

Intel
Table 39.
.
Table 40.
March 2005
92
®
IXP42X Product Line of Network Processors and IXC1100 Control Plane Processor
Device Clock Timings
Device Clock Timings (Crystal Reference)
Notes:
1.
2.
3.
4.
Notes:
IMPORTANT NOTE: Please refer to the product specification update regarding new crystal specifications.
1.
2.
3.
4.
7
T
FREQUENCY
FREQUENCY
Symbol
Symbol
C
ESR
SHUNT
T
T
V
C
V
C
C
C
C
DC
DC
IH
IL
IN
1
2
1
2
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.
Use the component values recommended by the crystal manufacturer.
This parameter applies when driving the clock input with an oscillator.
Where the IXP42X product line or IXC1100 control plane processor is configured with an input
reference-clock, the slew rate should never be faster than 2.5 V/nS to ensure proper PLL operation.
To help ensure proper PLL operation at the slower slew rate, the VIH and VIL voltage levels need to
be within the specified range at an input clock frequency of 33.33 MHz.
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.
Use the component values recommended by the crystal manufacturer.
This parameter applies when driving the clock input with an oscillator.
Where the IXP42X product line or IXC1100 control plane processor is configured with an input
reference-clock, the slew rate should never be faster than 2.5 V/nS to ensure proper PLL operation.
To help ensure proper PLL operation at the slower slew rate, the VIH and VIL voltage levels need to
be within the specified range at an input clock frequency of 33.33 MHz.
Load capacitance
Load capacitance
Duty cycle
Input-high voltage
Input-low voltage
Clock frequency for IXP42X product
line and IXC1100 control plane
processors crystal or oscillator.
Clock tolerance over -40º C to 85º C.
Equivalent Series Resistance
Pin capacitance of IXP42X product line
and IXC1100 control plane processors’
inputs.
C
sometimes referred to as the holder
capacitance.
Load capacitance
Load capacitance
Duty cycle
SHUNT
Document Number: 252479, Revision: 005
is a crystal parameter
Parameter
(Oscillator Reference) (Sheet 2 of 2)
Parameter
Min.
1.9
-50
35
2
Min.
35
Nom.
33.33
50
5
3
Nom.
50
Max.
Max.
1.6
50
60
65
65
4
Units
Units
MHz
ppm
pF
pF
%
pF
pF
pF
pF
%
:
V
V
Datasheet
Notes
Notes
1,
2
2
3
2
2
3
4