Ultra Low Current KX Series Crystal Oscillator
2.5 x 2.0mm
CMOS 32.768kHz
KX251
2.5 x 2.0mm Ceramic SMD
Package: (
Scale: none; Dimensions are in mm
)
Product Features
•
AT Cut 32.768 kHz XO
•
CMOS compatible logic levels
•
Ultra low active current (< 10µA)
•
Very tight temperature stability
•
Designed for standard reflow and washing
techniques
•
Pb-free and RoHS/Green compliant
Recommended Land Pattern:
CREATED USING CADSTD LITE FREEWARE FROM WWW.CADSTD.COM. NON-COMMERCIAL USE ONLY.
Product Description
The KX251 Series real time clock oscillator
achieves superb stability over a broad range
of operating conditions. It utilizes Pericom
proprietary technology to achieve ultra low
current less than 10µA. The output clock
signal is compatible with LVCMOS/LVTTL logic
levels. The device, available on tape and reel,
is contained in a 2.5 x 2.0mm surface-mount
ceramic package.
CREATED USING CADSTD LITE FREEWARE FROM WWW.CADSTD.COM. NON-COMMERCIAL USE ONLY.
Pin Functions:
Pin
Function
1
2
3
4
OE Function
Ground
Clock Output
V
DD
Applications
•
Real-Time Clock Oscillator where low current
and tight stability are needed
Part Ordering Information:
KX 251
V
A
I
B
S 032.768000
C
D
Voltage:
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
F = +/-20 ppm 0/+70°C
G = +/-25 ppm 0/+70°C
H = +/-25 ppm 0/+85°C
I = +/-25 ppm -20/+85°C
Z = Reference Design
Internal #:
Frequency:
1=+3.3V
2=+2.5V
3=+1.8V
B=+3.0V
0~9
FFF.FFFFFF
kHz, “3 digits/decimal/6 digits” format
Following the above format, Saronix-eCera part numbers will be assigned upon
confirmation of exact customer requirements.
SaRonix-eCera™ is a Pericom® Semiconductor company
14-0033
•
US: +1-408-435-0800 TW: +886-3-4518888
•
www.saronix-ecera.com
All specifications are subject to change without notice.
KX251
REV C
8/27/2014
1
CMOS 32.768kHz
KX251
Ultra Low Current KX Series Crystal Oscillator
2.5 x 2.0mm
Electrical Performance
Parameter
Min.
Typ.
Max.
Units
Notes
Output Frequency
+1.71
Supply Voltage
+2.25
+2.85
+3.0
Supply Current, Output Enabled
Supply Current, Standby Mode
Frequency Stability
Operating Temperature Range
Output Logic 0, V
OL
Output Logic 1, V
OH
Output Load
Duty Cycle
Rise and Fall Time
Start-up time
45
0.9 V
DD
-40
32.768
+1.8
+2.5
+3.0
+3.3
10
+1.89
+2.75
+3.15
+3.6
15
0.5
±50
+85
0.1 V
DD
15
55
35
50
10
kHz
V
V
V
V
µA
µA
ppm
C
V
V
pF
%
ns
ms
See Note 2
measured 50% of V
DD
measured 20/80% of V
DD
At 15pF load
Output Hi-Z
See part ordering options, and note 1
See part ordering options
See part ordering options
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. For specifications othere 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)
Internal Pullup Resistance
Output Disable Delay
Output Enable Delay
0.7 V
DD
0.3 V
DD
100
100
10
V
V
kΩ
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:
For test circuit go to:
http://www.pericom.com/products/timing/oscillators/KX251/
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
14-0033
•
US: +1-408-435-0800 TW: +886-3-4518888
•
www.saronix-ecera.com
All specifications are subject to change without notice.
KX251
REV C
8/27/2014
2
嵌入式系统
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