SiT5357
60 MHz – 220 MHz, ±0.1 to ±0.25 ppm,
Stratum 3, Elite Platform™ Precision Super-TCXO
Description
The
SiT5357
is a ±100 ppb precision MEMS Super-TCXO
that is fully compliant to Telcordia GR-1244-CORE Stratum
3 oscillator specifications. Engineered for best dynamic
performance, the SiT5357 is ideal for high reliability
telecom, wireless and networking, industrial, precision
GNSS and audio/video applications.
Leveraging SiTime’s unique DualMEMS™ temperature
sensing and TurboCompensation™ technologies, the
SiT5357 delivers the best dynamic performance for timing
stability in the presence of environmental stressors such as
air flow, temperature perturbation, vibration, shock, and
electromagnetic interference. This device also integrates
multiple on-chip regulators to filter power supply noise,
eliminating the need for a dedicated external LDO.
The SiT5357 offers three device configurations that can be
ordered using
Ordering Codes
for:
Features
◼
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Output 60–189 MHz, and 208–220 MHz, in 1 Hz steps
Factory programmable options for short lead time
Best dynamic stability under airflow, thermal shock
▪
±100 ppb stability across temperature
▪
±1 ppb/C typical frequency slope (ΔF/ΔT)
▪
1.5e-11 ADEV at 10 second averaging time
-40°C to +105°C operating temperature
No activity dips or micro jumps
Resistant to shock, vibration and board bending
On-chip regulators eliminate the need for external LDOs
2.5 V, 2.8 V, 3.0 V and 3.3 V supply voltage
LVCMOS output
Digital frequency pulling (DCTCXO) via I
2
C
▪
Digital control of output frequency and pull range
▪
Up to
±3200
ppm pull range
▪
Frequency pull resolution down to 5 ppt
2.5 V, 2.8 V, 3.0 V and 3.3 V supply voltage
LVCMOS output
RoHS and REACH compliant
Pb-free, Halogen-free, Antimony-free
Applications
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The SiT5357 can be factory programmed for any
combination of frequency, stability, voltage, and pull range.
Programmability enables designers to optimize clock
configurations while eliminating long lead times and
customization costs associated with quartz devices where
each frequency is custom built.
Refer to
Manufacturing Guideline
for proper reflow profile
and PCB cleaning recommendations to ensure best
performance.
4G/5G radio, Small cell
IEEE1588 boundary and grandmaster clocks
Synchronous Ethernet
Optical transport – SONET/SDH, OTN, Stratum 3
DOCSIS 3.x remote PHY
Precision GNSS systems
Test and measurement
Block Diagram
5.0 mm x 3.2 mm Package Pinout
SDA / NC
OE / VC / NC
SCL / NC
NC
GND
1
10
9
VDD
NC
NC
CLK
2
3
8
7
4
5
6
A0 / NC
Figure 1. SiT5357 Block Diagram
Figure 2. Pin Assignments (Top view)
(Refer to
Table 11
for Pin Descriptions)
Rev 1.06
May 10, 2020
www.sitime.com
SiT5357
60 MHz – 220 MHz, ±0.1 to ±0.25 ppm, Stratum 3, Elite Platform™ Precision Super-TCXO
Ordering Information
The part number guide illustrated below is for reference only, in which boxes identify order codes having more than one option.
To customize and build an exact part number, use the SiTime
Part Number Generator.
To validate the part number, use the
SiTime
Part Number Decoder.
Package Size
"F": 5.0 mm x 3.2 mm
Output Waveform
"-" : LVCMOS
[1]
Silicon Revision Letter
Part Family
Pin 1 Function
–
TCXO mode only
"E": Output Enable
"N": No Connect
TCXO
VCTCXO
DCTCXO
Temperature Range
SiT5357AC - FQ - 33 E 0 -
98.123456
T
SiT5357AC - FQ - 33 V T -
98.123456
T
SiT5357AC - FQG33 J R -
98.123456
T
Packaging
"T": 12 mm Tape & Reel, 3 ku reel
"Y": 12 mm Tape & Reel, 1 ku reel
“X”: 12 mm Tape & Reel, 250 u reel
(blank): bulk
[2]
"I": Industrial, -40 to 85°C
"C": Extended Commercial, -20 to 70°C
"E": Extended Industrial, -40 to 105°C
Frequency Stability
"Q": for
±0.1
ppm
"P": for
±0.2
ppm
"N": for
±0.25
ppm
Frequency
60.000001 MHz to 189.000000 MHz
208.000000 MHz to 220.000000 MHz
I
2
C Address Mode
–
DCTCXO mode only
“0”, “1”, “2”, “3”, “4”, “5”, “6”, “7”, “8”, “9”, “A”, “B”,
“C”, “D”, “E”, “F”: Order code representing hex
value of I
2
C address. When the I
2
C address is
factory programmed using this code, pin A0 is no
connect (NC).
“G”: I
2
C pin addressable mode. Address is set by
the logic on A0 pin.
Pull Range
–
DCTCXO mode only
"T":
±6.25
ppm
"R":
±10
ppm
"Q":
±12.5
ppm
"M":
±25
ppm
"B":
±50
ppm
"C":
±80
ppm
"E":
±100
ppm
"F":
±125
ppm
"G":
"H":
"X":
"L":
"Y":
"S":
"Z":
"U":
±150 ppm
±200 ppm
±400 ppm
±600 ppm
±800 ppm
±1200 ppm
±1600 ppm
±3200 ppm
Pin 1 Function
–
DCTCXO mode only
Supply Voltage
"25": 2.5 V
±10%
"28": 2.8 V
±10%
"30": 3.0 V
±10%
"33": 3.3 V
±10%
"I": Output Enable
"J": No Connect, software OE control
Notes:
1. “-“ corresponds to the default rise/fall time for LVCMOS output as specified in
Table 1
(Electrical Characteristics). Contact
SiTime
for other rise/fall time
options for best EMI or driving multiple loads. For differential outputs, contact
SiTime.
2. Bulk is available for sampling only.
Rev 1.06
Page 2 of 37
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SiT5357
60 MHz – 220 MHz, ±0.1 to ±0.25 ppm, Stratum 3, Elite Platform™ Precision Super-TCXO
TABLE OF CONTENTS
Description ................................................................................................................................................................................... 1
Features....................................................................................................................................................................................... 1
Applications ................................................................................................................................................................................. 1
Block Diagram ............................................................................................................................................................................. 1
5.0 mm x 3.2 mm Package Pinout ............................................................................................................................................... 1
Ordering Information .................................................................................................................................................................... 2
Electrical Characteristics.............................................................................................................................................................. 4
Device Configurations and Pin-outs ............................................................................................................................................. 9
Pin-out Top Views................................................................................................................................................................. 9
Test Circuit Diagrams for LVCMOS Outputs .............................................................................................................................. 10
Waveforms................................................................................................................................................................................. 11
Timing Diagrams ........................................................................................................................................................................ 11
Stability Diagrams ...................................................................................................................................................................... 11
Typical Performance Plots ......................................................................................................................................................... 12
Architecture Overview ................................................................................................................................................................ 15
Frequency Stability ............................................................................................................................................................. 15
Output Frequency and Format ............................................................................................................................................ 15
Output Frequency Tuning ................................................................................................................................................... 15
Pin 1 Configuration (OE, VC, or NC) .................................................................................................................................. 16
Device Configurations ................................................................................................................................................................ 16
TCXO Configuration ........................................................................................................................................................... 16
VCTCXO Configuration ...................................................................................................................................................... 17
DCTCXO Configuration ...................................................................................................................................................... 18
VCTCXO-Specific Design Considerations ................................................................................................................................. 19
Linearity .............................................................................................................................................................................. 19
Control Voltage Bandwidth ................................................................................................................................................. 19
FV Characteristic Slope K
V
................................................................................................................................................. 19
Pull Range, Absolute Pull Range ........................................................................................................................................ 20
DCTCXO-Specific Design Considerations ................................................................................................................................. 21
Pull Range and Absolute Pull Range .................................................................................................................................. 21
Output Frequency ............................................................................................................................................................... 22
I
2
C Control Registers .......................................................................................................................................................... 24
Register Descriptions.......................................................................................................................................................... 24
Register Address: 0x00. Digital Frequency Control Least Significant Word (LSW) ............................................................ 24
Register Address: 0x01. OE Control, Digital Frequency Control Most Significant Word (MSW) ......................................... 25
Register Address: 0x02. DIGITAL PULL RANGE CONTROL
[18]
........................................................................................ 26
Serial Interface Configuration Description .......................................................................................................................... 27
Serial Signal Format ........................................................................................................................................................... 27
Parallel Signal Format ........................................................................................................................................................ 28
Parallel Data Format ........................................................................................................................................................... 28
I
2
C Timing Specification ...................................................................................................................................................... 30
I
2
C Device Address Modes ................................................................................................................................................. 31
Schematic Example ............................................................................................................................................................ 32
Dimensions and Patterns ........................................................................................................................................................... 33
Layout Guidelines ...................................................................................................................................................................... 34
Manufacturing Guidelines .......................................................................................................................................................... 34
Additional Information ................................................................................................................................................................ 35
Revision History ......................................................................................................................................................................... 36
Rev 1.06
Page 3 of 37
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SiT5357
60 MHz – 220 MHz, ±0.1 to ±0.25 ppm, Stratum 3, Elite Platform™ Precision Super-TCXO
Electrical Characteristics
All Min and Max limits are specified over temperature and rated operating voltage with 15 pF output load unless otherwise
stated. Typical values are at 25°C and 3.3V Vdd.
Table 1. Output Characteristics
Parameters
Nominal Output Frequency Range
Symbol
F_nom
Min.
60.000001
208
Operating Temperature Range
T_use
-20
-40
-40
Frequency Stability over
Temperature
Initial Tolerance
Supply Voltage Sensitivity
Output Load Sensitivity
Frequency vs. Temperature Slope
F_stab
–
Typ.
–
–
–
–
–
–
Max.
189
220
+70
+85
+105
±0.1
Unit
MHz
MHz
°C
°C
°C
ppm
Extended Commercial, ambient temperature
Industrial, ambient temperature
Extended Industrial, ambient temperature
Referenced to (max frequency + min frequency)/2 over the
rated temperature range, in TCXO, DCTCXO, or VCTCXO
(VCTCXO with ±6.25 ppm pull range, Vc=Vdd/2)
Initial frequency at 25°C at 48 hours after 2 reflows
Vdd ±5%
15 pF ±10%
0.5°C/min temperature ramp rate, -20 to 85°C
0.5°C/min temperature ramp rate, -40 to -20°C
0.5°C/min temperature ramp rate, 85 to 105°C
0.5°C/min temperature ramp rate, -20 to 85°C
0.5°C/min temperature ramp rate, -40 to -20°C
0.5°C/min temperature ramp rate, 85 to 105°C
Inclusive of frequency variation due to temperature,
±10%
supply variation,
±1.5
pF load variation and 24-hour aging
-40 to 105°C, 0.5°C/min ramp rate, defined as
±ΔF/2
as
shown in
Figure 13,
contact
SiTime
for lower hysteresis
-40 to 85°C, 0.5°C/min ramp rate, defined as
±ΔF/2
as
shown in
Figure 13,
contact
SiTime
for lower hysteresis
-20 to 70°C, 0.5°C/min ramp rate, defined as
±ΔF/2
as
shown in
Figure 13,
contact
SiTime
for lower hysteresis
At 85°C, after 30-days of continued operation. Aging is
measured with respect to day 31.
At 85°C, after 2-days of continued operation. Aging is
measured with respect to day 3.
Condition
Frequency Coverage
Temperature Range
Frequency Stability - Stratum 3+ Grade
F_init
F_Vdd
F_load
ΔF/ΔT
–
–
–
–
–
–
–
±0.7
±0.2
±0.9
±1
±0.9
±0.008
±0.01
±0.008
–
±25
±15
±10
±0.5
±57
±73
±80
±87
1.5e-11
–
±4.7
±1.3
–
–
±6.4
±0.05
–
±3
±1
±2
–
±0.3
±3.6
±1.5
±2
±3.5
±3.3
±0.02
±0.035
±0.028
±0.15
±42
±27
±20
±2.0
±230
±320
±360
±400
–
±1
±10.4
±4.2
±0.2
±0.25
±10
±0.08
±0.28
±5
–
–
±4.6
ppm
ppb
ppb
ppb/°C
ppb/°C
ppb/°C
ppb/s
ppb/s
ppb/s
ppm
ppb
ppb
ppb
ppb
ppb
ppb
ppb
ppb
–
ppm
ppb
ppb
ppm
ppm
ppb/°C
ppb/s
ppm
ppb
ppm
ppm
ppm
Dynamic Frequency Change during
Temperature Ramp
F_dynamic
–
–
–
24-hour holdover Stability
Hysteresis Over Temperature
F_24_Hold
F_hys
–
–
–
–
One-Day Aging
One-Year Aging
5-Year Aging
10-Year Aging
20-Year Aging
Allan deviation
Initial Tolerance
Supply Voltage Sensitivity
Output Load Sensitivity
Frequency Stability over
Temperature
Frequency vs. Temperature Slope
Dynamic Frequency Change during
Temperature Ramp
24-hour holdover Stability
One-Day Aging
One-Year Aging
20-Year Aging
20-Year Total Stability
F_1d
F_1y
F_5y
F_10y
F_20y
ADEV
F_init
F_Vdd
F_load
F_stab
ΔF/ΔT
F_dynamic
F_24_Hold
F_1d
F_1y
F_20y
F_tot_20y
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
10 second averaging time
[3]
Initial frequency at 25°C at 48 hours after 2 reflows
Vdd ±5%
15 pF ±10%
Referenced to (max frequency + min frequency)/2 over the
rated temperature range. Vc=Vdd/2 for VCTCXO
-40 to 105°C
0.5°C/min temperature ramp rate
Inclusive of frequency variation due to temperature,
±10%
supply variation,
±1.5
pF load variation and 24-hour aging
At 25°C, after 30-days of continued operation. Aging is
measured with respect to day 31
At 25°C, after 2-days of continued operation. Aging is
measured with respect to day 3
Complies with Stratum 3, per GR-1244-CORE. Actual
performance is better
Frequency Stability - Stratum 3 Grade
Rev 1.06
Page 4 of 37
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SiT5357
60 MHz – 220 MHz, ±0.1 to ±0.25 ppm, Stratum 3, Elite Platform™ Precision Super-TCXO
Table 1. Output Characteristics (continued)
Parameters
Duty Cycle
Rise/Fall Time
Output Voltage High
Output Voltage Low
Output Impedance
Symbol
DC
Tr, Tf
VOH
VOL
Z_out_c
Min.
45
42
0.8
90%
–
–
–
–
–
Start-up Time
T_start
–
Typ.
–
–
1.2
–
–
17
17
18
19
2.5
Max.
55
55
1.9
–
10%
–
–
–
–
3.5
Unit
%
%
ns
Vdd
Vdd
Ohms
Ohms
Ohms
Ohms
ms
60 to 150 MHz
150 to 189 MHz, 200 to 220 MHz
10% - 90% Vdd
IOH = +3 mA
IOL = -3 mA
Impedance looking into output buffer, Vdd = 3.3 V
Impedance looking into output buffer, Vdd = 3.0 V
Impedance looking into output buffer, Vdd = 2.8 V
Impedance looking into output buffer, Vdd = 2.5 V
Time to first pulse, measured from the time Vdd reaches
90% of its final value. Vdd ramp time = 100 µs from 0 V to
Vdd
See
Timing Diagrams
section below
Time to first accurate pulse within rated stability, measured
from the time Vdd reaches 90% of its final value. Vdd
ramp time = 100 µs
Condition
LVCMOS Output Characteristics
Start-up Characteristics
Output Enable Time
Time to Rated Frequency Stability
T_oe
T_stability
–
–
–
5
285
45
ns
ms
Note:
3. Measured 2 hours after startup in a temperature chamber with a constant temperature in still air.
Rev 1.06
Page 5 of 37
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