SiT9121AI-2D2-33E125.000000T 数据手册
SiT9121
1 MHz − 220 MHz High Performance Differential Oscillator
Features
Applications
Any frequency between 1 MHz and 220 MHz accurate
to 6 decimal places
LVPECL and LVDS output signaling types
0.6ps RMS phase jitter (random) over 12 kHz to 20 MHz
bandwidth
Frequency stability as low as ±10 ppm
Industrial and extended commercial temperature ranges
Industry-standard packages: 3.2 x 2.5, 5.0 x 3.2 and
7.0 x 5.0 mm x mm
For other frequencies, refer to SiT9120 and SiT9122
datasheets
10 GB Ethernet, SONET, SATA, SAS, Fibre Channel,
PCI-Express
Telecom, networking, instrumentation, storage, server
Electrical Characteristics
Table 1. Electrical Characteristics
Parameters
Symbol
Min.
Typ.
Max.
Unit
Condition
LVPECL and LVDS, Common Electrical Characteristics
Supply Voltage
Output Frequency Range
Frequency Stability
2.97
3.3
3.63
V
2.25
2.5
2.75
V
2.25
–
3.63
V
f
1
–
220
MHz
F_stab
-10
–
+10
ppm
-20
–
+20
ppm
-25
–
+25
ppm
-50
–
+50
ppm
Vdd
Termination schemes in Figures 1 and 2 - XX ordering code
Inclusive of initial tolerance, operating temperature,
rated power supply voltage, and load variations
First Year Aging
F_aging1
-2
–
+2
ppm
25°C
10-year Aging
F_aging10
-5
–
+5
ppm
25°C
T_use
-40
–
+85
°C
Industrial
-20
–
+70
°C
Extended Commercial
Operating Temperature Range
Input Voltage High
VIH
70%
–
–
Vdd
Pin 1, OE or ST
Input Voltage Low
VIL
–
–
30%
Vdd
Pin 1, OE or ST
Z_in
–
100
250
kΩ
Pin 1, OE logic high or logic low, or ST logic high
2
–
–
MΩ
Pin 1, ST logic low
Input Pull-up Impedance
Start-up Time
T_start
–
6
10
ms
Measured from the time Vdd reaches its rated minimum value.
Resume Time
T_resume
–
6
10
ms
In Standby mode, measured from the time ST pin crosses
50% threshold.
DC
45
–
55
%
Contact SiTime for tighter duty cycle
Duty Cycle
LVPECL, DC and AC Characteristics
Idd
–
61
69
mA
Excluding Load Termination Current, Vdd = 3.3V or 2.5V
OE Disable Supply Current
I_OE
–
–
35
mA
OE = Low
Output Disable Leakage Current
I_leak
–
–
1
A
OE = Low
Standby Current
I_std
–
–
100
A
ST = Low, for all Vdds
I_driver
–
–
30
mA
Maximum average current drawn from OUT+ or OUT-
Output High Voltage
VOH
Vdd-1.1
–
Vdd-0.7
V
See Figure 1(a)
Output Low Voltage
VOL
Vdd-1.9
–
Vdd-1.5
V
See Figure 1(a)
V_Swing
1.2
1.6
2.0
V
See Figure 1(b)
Rise/Fall Time
Tr, Tf
–
300
700
ps
20% to 80%, see Figure 1(a)
OE Enable/Disable Time
T_oe
–
–
115
ns
f = 212.5 MHz - For other frequencies, T_oe = 100ns + 3 period
RMS Period Jitter
T_jitt
–
1.2
1.7
ps
f = 100 MHz, VDD = 3.3V or 2.5V
–
1.2
1.7
ps
f = 156.25 MHz, VDD = 3.3V or 2.5V
–
1.2
1.7
ps
f = 212.5 MHz, VDD = 3.3V or 2.5V
–
0.6
0.85
ps
f = 156.25 MHz, Integration bandwidth = 12 kHz to 20 MHz,
all Vdds
Current Consumption
Maximum Output Current
Output Differential Voltage Swing
RMS Phase Jitter (random)
Rev 1.08
T_phj
August 17, 2019
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SiT9121 1 MHz − 220 MHz High Performance Differential Oscillator
Table 1. Electrical Characteristics (continued)
Parameter
Symbol
Min.
Typ.
Max.
Unit
Condition
LVDS, DC and AC Characteristics
Idd
–
47
55
mA
Excluding Load Termination Current, Vdd = 3.3V or 2.5V
OE Disable Supply Current
I_OE
–
–
35
mA
OE = Low
Differential Output Voltage
VOD
250
350
450
mV
See Figure 2
Output Disable Leakage Current
I_leak
–
–
1
A
OE = Low
I_std
–
–
100
A
ST = Low, for all Vdds
VOD
–
–
50
mV
See Figure 2
Current Consumption
Standby Current
Delta VOD
VOS
1.125
1.2
1.375
V
See Figure 2
Delta VOS
VOS
–
–
50
mV
See Figure 2
Rise/Fall Time
Tr, Tf
–
495
700
ps
20% to 80%, see Figure 2
OE Enable/Disable Time
T_oe
–
–
115
ns
f = 212.5 MHz - For other frequencies, T_oe = 100ns + 3 period
–
1.2
1.7
ps
f = 100 MHz, VDD = 3.3V or 2.5V
–
1.2
1.7
ps
f = 156.25 MHz, VDD = 3.3V or 2.5V
–
1.2
1.7
ps
f = 212.5 MHz, VDD = 3.3V or 2.5V
–
0.6
0.85
ps
f = 156.25 MHz, Integration bandwidth = 12 kHz to 20 MHz, all Vdds
Offset Voltage
RMS Period Jitter
T_jitt
RMS Phase Jitter (random)
T_phj
Table 2. Pin Description
Pin
Map
Functionality
No Connect; Leave it floating or connect to GND
for better heat dissipation
H or Open: specified frequency output
L: output is high impedance
NC
NA
OE
Input
ST
Input
H or Open: specified frequency output
L: Device goes to sleep mode. Supply current reduces to I_std.
2
NC
NA
No Connect; Leave it floating or connect to GND for better heat
dissipation
3
GND
Power
VDD Power Supply Ground
4
OUT+
Output
Oscillator output
5
OUT-
Output
Complementary oscillator output
6
VDD
Power
Power supply voltage
1
Rev 1.08
Top View
NC/OE/ST
1
6
VDD
NC
2
5
OUT-
GND
3
4
OUT+
Figure 1. Pin Assignments
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SiT9121 1 MHz − 220 MHz High Performance Differential Oscillator
Table 3. Absolute Maximum Limits
Attempted operation outside the absolute maximum ratings of the part may cause permanent damage to the part.
Actual performance of the IC is only guaranteed within the operational specifications, not at absolute maximum ratings.
Min.
Max.
Unit
Storage Temperature
Parameter
-65
150
°C
VDD
-0.5
4
V
–
2000
V
–
260
°C
Electrostatic Discharge (HBM)
Soldering Temperature (follow standard Pb free soldering guidelines)
[1]
Table 4. Thermal Consideration
JA, 4 Layer Board (°C/W)
Package
JC, Bottom (°C/W)
7050, 6-pin
142
27
5032, 6-pin
97
20
3225, 6-pin
109
20
Note:
1. Refer to JESD51-7 for JA and JC definitions, and reference layout used to determine the JA and JC values in the above table.
Table 5. Maximum Operating Junction Temperature[2]
Max Operating Temperature (ambient)
Maximum Operating Junction Temperature
70°C
90°C
85°C
105°C
Note:
2. Datasheet specifications are not guaranteed if junction temperature exceeds the maximum operating junction temperature.
Table 6. Environmental Compliance
Parameter
Condition/Test Method
Mechanical Shock
MIL-STD-883F, Method 2002
Mechanical Vibration
MIL-STD-883F, Method 2007
Temperature Cycle
JESD22, Method A104
Solderability
MIL-STD-883F, Method 2003
Moisture Sensitivity Level
MSL1 @ 260°C
Rev 1.08
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SiT9121 1 MHz − 220 MHz High Performance Differential Oscillator
Waveform Diagrams
OUT80%
80%
20%
20%
VOH
OUT+
Tr
VOL
Tf
GND
Figure 1(a). LVPECL Voltage Levels per Differential Pin (i.e. OUT+, or OUT-)
V_ Swing
0V
t
Figure 1(b). LVPECL Voltage Levels Across Differential Pair (i.e. OUT+ minus OUT-)
OUT80%
80%
VOD
20%
20%
OUT+
VOS
Tr
Tf
GND
Figure 2. LVDS Voltage Levels per Differential Pin (i.e. OUT+, or OUT-)
Rev 1.08
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SiT9121 1 MHz − 220 MHz High Performance Differential Oscillator
Termination Diagrams
LVPECL
VDD
Z0 = 50
OUT+
D+
Receiver Device
LVPECL Driver
Z0 = 50
OUT-
D50
50
VTT = VDD – 2.0 V
Figure 3. LVPECL Typical Termination
VDD= 3.3V => R1 = 100 to 150
VDD= 2.5V => R1 = 75
VDD
100 nF
Z0 = 50
OUT+
D+
Receiver Device
LVPECL Driver
100 nF
Z0 = 50
OUTR1
R1
D50
50
VTT
Figure 4. LVPECL AC Coupled Termination
VDD = 3.3V => R1 = R3 = 133 and
R2 = R4 = 82
VDD = 2.5V => R1 = R3 = 250 and
R2 = R4 = 62.5
VDD
R1
VDD
OUT+
R3
Z0 = 50
D+
Receiver Device
LVPECL Driver
OUT-
Z0 = 50
DR2
R4
Figure 5. LVPECL with Thevenin Typical Termination
Rev 1.08
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SiT9121 1 MHz − 220 MHz High Performance Differential Oscillator
Termination Diagrams (continued)
LVDS
VDD
OUT+
Z0 = 50
D+
100
LVDS Driver
OUT-
Z0 = 50
Receiver Device
D-
Figure 6. LVDS Single Termination (Load Terminated)
Rev 1.08
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SiT9121 1 MHz − 220 MHz High Performance Differential Oscillator
Dimensions and Patterns
Package Size – Dimensions (Unit: mm)[3]
Recommended Land Pattern (Unit: mm)
[4]
3.2 x 2.5 x 0.75 mm
3.2±0.05
#4
#2
#3
1.6
0.7
YXXXX
#6
0.9
YXXXX
#1
#5
#4
#3
#2
1.00
#5
2.5±0.05
#6
2.25
2.20
#1
0.6
0.65
1.05
0.75±0.05
5.0 x 3.2 x 0.75 mm
2.54
5.0±0.10
#4
#5
3.2±0.10
#4
YXXXX
YXXXX
#6
1.20
#5
#6
0.90
#1
#2
#3
#3
#2
#1
0.64
0.75±0.05
7.0 x 5.0x 0.90 mm
7.0±0.10
5.08
#4
#6
1.10
YXXXX
5.08
#5
3.80
#4
2.60
#5
5.0±0.10
#6
#1
#2
#3
#3
#2
1.60
YXXXX
#1
1.40
0.90 ±0.10
1.60
Notes:
3. Top Marking: Y denotes manufacturing origin and XXXX denotes manufacturing lot number. The value of “Y” will depend on the as sembly location of
the device.
4. A capacitor of value 0.1 F between VDD and GND is recommended.
Rev 1.08
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SiT9121 1 MHz − 220 MHz High Performance Differential Oscillator
Ordering Information
SiT9121AC-1C2-33E125.000000T
Packaging:
Part Family
“SiT9121”
“T”, “Y”, “X”, “D”, “E”, or “G”
Refer to table below for packing
method
Leave Blank for Bulk
Revision Letter
“A” is the revision of Silicon
Frequency
1.000000 MHz to 220.000000 MHz
Temperature Range
Feature Pin
“N” for No Connect
“E” for Output Enable
“S” for Standby
“I” Industrial, -40 to 85°C
“C” Extended Commercial, -20 to 70°C
Signalling Type
“1” = LVPECL
“2” = LVDS
Voltage Supply
“25” for 2.5V ±10%
“33” for 3.3V ±10%
“XX” for 2.25V to 3.63V
Package Size
“B” 3.2 x 2.5 mm x mm
“C” 5.0 x 3.2 mm x mm
“D” 7.0 x 5.0 mm x mm
Frequency Stability
“F” for ±10 ppm
“1” for ±20 ppm
“2” for ±25 ppm
“3” for ±50 ppm
Table 7. Frequencies Not Supported
Frequency Range
Min.
Max.
209.000001 MHz
210.999999 MHz
Table 8. Ordering Codes for Supported Tape & Reel Packing Method
Device Size
8 mm T&R
(3ku)
8 mm T&R
(1ku)
8 mm T&R
(250u)
7.0 x 5.0 mm
–
–
–
–
5.0 x 3.2 mm
–
–
–
T
3.2 x 2.5 mm
D
E
G
T
Y
Rev 1.08
12 mm T&R
(3ku)
12 mm T&R
(1ku)
Page 8 of 13
12 mm T&R
(250u)
16 mm T&R
(3ku)
16 mm T&R
(1ku)
16 mm T&R
(250u)
–
–
T
Y
X
Y
X
–
–
–
X
–
–
–
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SiT9121 1 MHz − 220 MHz High Performance Differential Oscillator
Table 9. Revision History
Revisions
Release Date
1.01
02/20/2013
Change Summary
Original
1.02
12/03/2013
Added input specifications, LVPECL/LVDS waveforms, packaging T&R options
1.03
02/06/2014
Added 8mm T&R option and ±10 ppm
1.04
04/08/2014
Included 1.8V option for LVDS output only
1.05
07/30/2014
Included Thermal Consideration table
1.06
10/20/2014
Modified Thermal Consideration values. Preliminary removed from the title
1.07
04/03/2017
Removed 1.8V option
1.08
08/17/2019
Added No Connect feature to Pin 1
Added Table 5: Maximum Operating Junction Temperature
Updated logo and company address, other page layout changes
SiTime Corporation, 5451 Patrick Henry Drive, Santa Clara, CA 95054, USA | Phone: +1-408-328-4400 | Fax: +1-408-328-4439
© SiTime Corporation 2013-2019. The information contained herein is subject to change at any time without notice. SiTime assumes no responsibility or liabi lity for any loss, damage
or defect of a Product which is caused in whole or in part by (i) use of any circuitry other than circuitry embodied in a SiTime product, (ii) misuse or abuse including static discharge, neglect
or accident, (iii) unauthorized modification or repairs which have been soldered or altered during assembly and are not capable of being tested by SiTime under its normal test conditions, or
(iv) improper installation, storage, handling, warehousing or transportation, or (v) being subjected to unusual physical, thermal, or electrical stress.
Disclaimer: SiTime makes no warranty of any kind, express or implied, with regard to this material, and specifically disclaims any and all express or implied warranties, either in fact or by
operation of law, statutory or otherwise, including the implied warranties of merchantability and fitness for use or a particular purpose, and any implied warranty arising from course of dealing or
usage of trade, as well as any common-law duties relating to accuracy or lack of negligence, with respect to this material, any SiTime product and any product documentation. Products sold by
SiTime are not suitable or intended to be used in a life support application or component, to operate nuclear facilities, or in other mission critical applications where human life may be involved
or at stake. All sales are made conditioned upon compliance with the critical uses policy set forth below.
CRITICAL USE EXCLUSION POLICY
BUYER AGREES NOT TO USE SITIME'S PRODUCTS FOR ANY APPLICATION OR IN ANY COMPONENTS USED IN LIFE SUPPORT DEVICES OR TO OPERATE NUCLEAR
FACILITIES OR FOR USE IN OTHER MISSION-CRITICAL APPLICATIONS OR COMPONENTS WHERE HUMAN LIFE OR PROPERTY MAY BE AT STAKE.
SiTime owns all rights, title and interest to the intellectual property related to SiTime's products, including any software, firmware, copyright, patent, or trademark. The sale of SiTime products does
not convey or imply any license under patent or other rights. SiTime retains the copyright and trademark rights in all documents, catalogs and plans supplied pursuant to or ancillary to the sale
of products or services by SiTime. Unless otherwise agreed to in writing by SiTime, any reproduction, modification, translation, compilation, or representation of this material shall be strictly
prohibited.
Rev 1.08
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Silicon MEMS Outperforms Quartz
Supplemental Information
The Supplemental Information section is not part of the datasheet and is for informational purposes only.
Rev 1.08
Page 10 of 13
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Silicon MEMS Outperforms Quartz
Best Reliability
Best Electro Magnetic Susceptibility (EMS)
Silicon is inherently more reliable than quartz. Unlike quartz
suppliers, SiTime has in-house MEMS and analog CMOS
expertise, which allows SiTime to develop the most reliable
products. Figure 1 shows a comparison with quartz
technology.
SiTime’s oscillators in plastic packages are up to 54 times
more immune to external electromagnetic fields than quartz
oscillators as shown in Figure 3.
Why is SiTime Best in Class:
SiTime’s MEMS resonators are vacuum sealed using an
advanced EpiSeal™ process, which eliminates foreign
particles and improves long term aging and reliability
World-class MEMS and CMOS design expertise
Why is SiTime Best in Class:
Internal differential architecture for best common mode
noise rejection
Electrostatically driven MEMS resonator is more immune
to EMS
Reliability (Million Hours)
SiTime
1,140
IDT
38
EPSN
28
KYCA
EPSN
TXC
CW
SLAB
SiTime
Figure 3. Electro Magnetic Susceptibility (EMS)[3]
Figure 1. Reliability Comparison[1]
Best Power Supply Noise Rejection
Best Aging
Unlike quartz, MEMS oscillators have excellent long
term aging performance which is why every new SiTime
product specifies 10-year aging. A comparison is shown
in Figure 2.
Why is SiTime Best in Class:
SiTime’s MEMS oscillators are more resilient against noise
on the power supply. A comparison is shown in Figure 4.
Why is SiTime Best in Class:
SiTime’s MEMS resonators are vacuum sealed using an
advanced EpiSeal™ process, which eliminates foreign
particles and improves long term aging and reliability
Inherently better immunity of electrostatically driven
MEMS resonator
On-chip regulators and internal differential architecture
for common mode noise rejection
MEMS resonator is paired with advanced analog CMOS
IC
SiTime
EPSN
KYCA
MEMS vs. Quartz Aging
EpiSeal
Oscillator
SiTimeMEMS
Oscillator
Quartz
QuartzOscillator
Oscillator
10
8
Aging ( PPM)
8
6
4
2
3
3.5
1.5
Figure 4. Power Supply Noise Rejection[4]
0
1-Year
10-Year
Figure 2. Aging Comparison[2]
Rev 1.08
Page 11 of 13
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Silicon MEMS Outperforms Quartz
Best Vibration Robustness
Best Shock Robustness
High-vibration environments are all around us. All
electronics, from handheld devices to enterprise servers
and storage systems are subject to vibration. Figure 5
shows a comparison of vibration robustness.
SiTime’s oscillators can withstand at least 50,000 g shock.
They all maintain their electrical performance in operation
during shock events. A comparison with quartz devices is
shown in Figure 6.
Why is SiTime Best in Class:
Why is SiTime Best in Class:
The moving mass of SiTime’s MEMS resonators is up to
3000 times smaller than quartz
Center-anchored MEMS resonator is the most robust
design
Vibration Sensitivity (ppb/g)
TXC
TXC
EPS
CW
KYCA
KYCA
SLAB
The moving mass of SiTime’s MEMS resonators is up to
3000 times smaller than quartz
Center-anchored MEMS resonator is the most robust
design
EpiSeal
SiTime MEMS
100.0
10.0
1.0
0.1
0.0
10
100
1000
KYCA
Vibration Frequency (Hz)
Figure 5. Vibration Robustness[5]
EPSN
TXC
CW
SLAB
SiTime
Figure 6. Shock Robustness[6]
Figure labels:
TXC = TXC
Epson = EPSN
Connor Winfield = CW
Kyocera = KYCA
SiLabs = SLAB
SiTime = EpiSeal MEMS
Rev 1.08
Page 12 of 13
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Silicon MEMS Outperforms Quartz
Notes:
1. Data source: Reliability documents of named companies.
2. Data source: SiTime and quartz oscillator devices datasheets.
3. Test conditions for Electro Magnetic Susceptibility (EMS):
According to IEC EN61000-4.3 (Electromagnetic compatibility standard)
Field strength: 3V/m
Radiated signal modulation: AM 1 kHz at 80% depth
Carrier frequency scan: 80 MHz – 1 GHz in 1% steps
Antenna polarization: Vertical
DUT position: Center aligned to antenna
Devices used in this test:
Label
Manufacturer
Part Number
Technology
EpiSeal MEMS
SiTime
SiT9120AC-1D2-33E156.250000
MEMS + PLL
EPSN
Epson
EG-2102CA156.2500M-PHPAL3
Quartz, SAW
TXC
TXC
BB-156.250MBE-T
Quartz, 3 Overtone
CW
Conner Winfield
P123-156.25M
Quartz, 3 Overtone
KYCA
AVX Kyocera
KC7050T156.250P30E00
Quartz, SAW
SLAB
SiLab
590AB-BDG
Quartz, 3rd Overtone + PLL
rd
rd
4. 50 mV pk-pk Sinusoidal voltage.
Devices used in this test:
Label
Manufacturer
Part Number
Technology
EpiSeal MEMS
SiTime
SiT8208AI-33-33E-25.000000
MEMS + PLL
NDK
NDK
NZ2523SB-25.6M
Quartz
KYCA
AVX Kyocera
KC2016B25M0C1GE00
Quartz
EPSN
Epson
SG-310SCF-25M0-MB3
Quartz
5. Devices used in this test:
same as EMS test stated in Note 3.
6. Test conditions for shock test:
MIL-STD-883F Method 2002
Condition A: half sine wave shock pulse, 500-g, 1ms
Continuous frequency measurement in 100 μs gate time for 10 seconds
Devices used in this test:
same as EMS test stated in Note 3.
7. Additional data, including setup and detailed results, is available upon request to qualified customer. Please contact productsupport@sitime.com.
Rev 1.08
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