Ultra Low Jitter PLL Crystal Oscillator 2.5 x 2.0mm
2.5V/3.3V CMOS XO
NX251
2.5 x 2.0mm Ceramic SMD
Package:
(Scale: none, Dimensions are in mm)
Product Features
• Very low phase jitter - < 1ps RMS max.
• Wide frequency range - 5 ~ 250MHz
• Thicker crystal for improved reliability
• Low supply current - 50mA max.
• Industrial Temperature Range
• Pb-free & RoHS compliant
• Fast lead time
Recommended Land Pattern:
CREATED USING CADSTD LITE FREEWARE FROM WWW.CADSTD.COM. NON-COMMERCIAL USE ONLY.
Product Description
The NX251 XO series is a high performance
CMOS crystal oscillator family with very low
jitter performance. It supports various options
including wider frequency range, 2.5V/3.3V
voltage, and various stabilities.
It is designed to meet the clock source
specifications for communication systems, and
other high performance equipment.
Pin Functions:
Pin
Function
1
2
3
4
OE Function
Ground
Output
V
DD
Applications
• Networking systems
• Servers and storage systems
• Consumer applications
• Portable Multimedia Devices
• Bluetooth
CREATED USING CADSTD LITE FREEWARE FROM WWW.CADSTD.COM. NON-COMMERCIAL USE ONLY.
*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.
Part Ordering Information:
NX 251
Voltage:
V
A
I
B
FFFF.FFFFFF
C
1=+3.3V
2=+2.5V
Stability and Temp Range:
Stability
A = +/-20 ppm
B = +/-25 ppm
C = +/-50 ppm
D = +/-25 ppm
E = +/-50 ppm
Temp Range
-20/+70°C
-20/+70°C
-20/+70°C
-40/+85°C
-40/+85°C
Frequency:
FFFF.FFFFFF
MHz, “4 digits/decimal/6 digits” format
SaRonix-eCera™ is a Pericom® Semiconductor company
•
US: +1-408-232-9100 TW: +886-3-4518888
•
www.pericom.com
14-0045
All specifications are subject to change without notice.
NX251
Rev B
08/13/14
1
2.5V/3.3V CMOS XO
NX251
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, Accumulated, RMS (1-σ)
< 40MHz
Jitter, Phase, RMS
Jitter, pk-pk
40 to 250MHz
125MHz, 156.25MHz
5
3.135
2.375
3.3
2.5
250
3.465
2.625
60
40
±50
MHz
V
mA
mA
ppm
°C
V
V
pF
%
ns
ps
ps
ps
ps
ps
Measured 50% V
DD
Measured 20/80% of waveform
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
V
DD
-0.4
+85
0.4
15
45
55
3
6
0.4
0.4
0.4
1
1
0.6
40
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
DD
0.3 V
DD
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
For the latest product information visit:
For test circuit go to:
-55
+125
°C
http://www.pericom.com/products/crystals-and-crystal-oscillators/hiflex-xo/?part=NX251
http://www.pericom.com/pdf/sre/tc_hcmos2.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
•
www.pericom.com
14-0045
All specifications are subject to change without notice.
NX251
Rev B
08/13/14
2
PCB设计
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