Ultra Low Jitter PLL Crystal Oscillator 2.5 x 2.0mm
2.5V/3.3V HCSL XO
NX254
2.5 x 2.0mm Ceramic SMD
Package:
(Scale: none; dimensions are in mm)
Product Features
•
Meet PCIe Gen2 and Gen3 clock
requirements at 100MHz
•
Very low phase jitter - < 1.0ps RMS max.
•
Wide frequency range - 5 ~ 212.5MHz
•
Thicker crystal for improved reliability
2.25
Recommended Land Pattern:
2.70
1.50
0.70
0.60
•
Low supply current - 70mA max.
•
Industrial Temperature Range
•
Pb-free & RoHS compliant
•
Fast lead time
0.95
0.35
Product Description
The NX254 XO series is a high performance
HCSL crystal oscillator family with very low
jitter performance. Other than PCIe clock
frequencies, it also supports various options
including other Networking frequencies,
2.5V/3.3V voltage, and various stabilities.
It is designed to meet the clock source
specifications for PCIe interface, SGMII of
communication systems, and other high
performance equipment.
Pin Functions:
Pin
Function
1
2
3
4
5
6
0.57
1.11
OE Function
N/C
Ground
Q
Q
V
CC
*Extended high frequency power decoupling is recommended (see test circuit for minimum
recommendation). To ensure optimal performance, do not route RF traces beneath the
package.
Applications
•
Networking systems
•
Servers and storage systems
•
Profession video equipments
•
Test and measurement
•
FPGA/ASIC clock generation
SaRonix-eCera™ is a Pericom® Semiconductor company
•
Part Ordering Information:
UX 70
V
NX 254
A
B
C
I
1
FFFF.FFFFFF
FFFF.FFFFFF
Stability and Temp Range:
Stability Temp Range
A = +/-20 ppm -20/+70°C
B = +/-25 ppm -20/+70°C
C = +/-50 ppm -20/+70°C
D = +/-25 ppm -40/+85°C
E = +/-50 ppm -40/+85°C
Voltage:
1=+3.3V
2=+2.5V
Frequency:
FFFF.FFFFFF
MHz, “4 digits/decimal/6 digits” format
US: +1-408-232-9100 TW: +886-3-4518888
NX254
•
www.pericom.com
Rev A
02/05/15
All specifications are subject to change without notice.
15-0037
1
2.5V/3.3V HCSL XO
NX254
Ultra Low Jitter PLL Crystal Oscillator 2.5 x 2.0mm
Electrical Performance
Parameter
Min.
Typ.
Max.
Units
Notes
Output Frequency
Supply Voltage
Supply Current, Output Enabled
Supply Current, Output Disabled only
Frequency Stability
Operating Temperature Range
Output Logic 0, V
OL
Output Logic 1, V
OH
Output Load
Duty Cycle
Rise and Fall Time
Jitter, RMS
Jitter, RMS
PCIe Gen2, 100 MHz
PCIe Gen3, 100 MHz
< 40MHz
Jitter, Phase, RMS
Jitter, pk-pk
40 to 212.5MHz
100MHz, 125MHz
5
3.135
2.375
3.3
2.5
212.5
3.465
2.625
70
40
±50
MHz
V
mA
mA
ppm
°C
V
V
Output requires termination
%
ps
ps
ps
ps
ps
ps
ps
ps
Measured 50% V
CC
Measured from V
OL
= 0.175V to V
OH
= 0.5252V
As defined by PCI-SIG for PCIe Gen2
As defined by PCI-SIG for PCIe Gen3
20.000 adjacent periods
12kHz to 5 MHz frequency band
12kHz to 20 MHz frequency band
12kHz to 20 MHz frequency band
100,000 random periods
See ordering options
See ordering options
See ordering options
-40
-0.15
0.66
45
0
0.7
+85
0.9
55
700
2.0
0.43
0.4
0.4
0.4
3.0
1.0
6
1
1
0.6
40
R
S
= 33Ω, R
P
= 50Ω, C
L
= 2pF
Jitter, Accumulated , RMS (1-σ)
Notes:
1. Stability includes all combinations of operating temperature, load changes, rated input (supply) voltage changes, initial calibration tolerance (25°C),
aging (1 year at 25°C average effective ambient temperature), shock and vibration.
2. Phase jitter typical value is depending on output frequencies.
3. For specifications other than those listed, please contact sales.
Output Enable / Disable Function
Parameter
Min.
Typ.
Max.
Units
Notes
Input Voltage (pin 1), Output Enable
Input Voltage (pin 1), Output Disable (low power standby)
Output Disable Delay
Output Enable Delay
Start up Time
0.7 V
CC
0.3 V
CC
100
100
10
V
V
ns
ns
ms
or open
Output is Hi-Z
Absolute Maximum Ratings
Parameter
Min.
Typ.
Max.
Units
Notes
Storage Temperature
-55
+125
°C
For the latest product information visit:
http://www.pericom.com/products/crystals-and-crystal-oscillators/hiflex-xo/?part=NX254
For test circuit go to:
http://www.pericom.com/pdf/sre/tc-hcsl.pdf
For soldering reflow profile and reliability test ratings go to:
http://www.pericom.com/pdf/sre/reflow.pdf
For tape and reel information go to:
http://www.pericom.com/pdf/sre/tr_2520_xo.pdf
SaRonix-eCera™ is a Pericom® Semiconductor company
•
US: +1-408-232-9100 TW: +886-3-4518888
NX254
•
www.pericom.com
Rev A
02/05/15
All specifications are subject to change without notice.
15-0037
2
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