The Smart Timing Choice
The Smart Timing Choice
SiTime Corporation 990 Almanor Avenue, Sunnyvale, CA 94085 (408) 328-4400 www.sitime.com
Rev. 1.7 Revised November 18, 2013
SiT9003
Low Power Spread Spectrum Oscillator
Features Applications
Frequency range from 1 MHz to 110 MHz Printers
LVCMOS/LVTTL compatible output Flat panel drivers
Standby current as low as 0.4 µA PCI
Fast resume time of 3 ms (Typ) Microprocessors
<30 ps cycle-to-cycle jitter
Spread options (contact SiTime for other spread options)
• Center spread: ±0.50%, ±0.25%
• Down spread: -1%, -0.5%
Standby, output enable, or spread disable mode
Industry-standard packages: 2.5 x 2.0, 3.2 x 2.5, 5.0 x 3.2,
7.0 x 5.0 mm x mm
Outstanding mechanical robustness for portable applications
All-silicon device with outstanding reliability of 2 FIT
(10x improvement over quartz-based devices), enhancing system
mean-time-to-failure (MTBF)
Pb-free, RoHS and REACH compliant
DC Electrical Characteristics
Parameters Symbol Min. Typ. Max. Unit Condition
Output Frequency Range f1–110MHz
Frequency Tolerance F_tol -50 – +50 PPM Inclusive of: Initial stability, operating temperature, rated power,
supply voltage change, load change, shock and vibration
Spread Off
-100 – +100 PPM
Aging Ag -1 – 1 PPM 1st year at 25°C
Operating Temperature Range T_use -20 – +70 °C Extended Commercial
-40 – +85 °C Industrial
Supply Voltage Vdd 1.71 1.8 1.89 V
2.25 2.5 2.75 V
2.52 2.8 3.08 V
2.97 3.3 3.63 V
Current Consumption Idd – 3.7 4.1 mA No load condition, f = 20 MHz, Vdd = 2.5 V, 2.8 V or 3.3 V
– 3.2 3.5 mA No load condition, f = 20 MHz, Vdd = 1.8 V
Standby Current I_std – 2.4 4.3 µAST = GND, Vdd = 3.3 V, Output is Weakly Pulled Down
–1.22.2
µAST = GND, Vdd = 2.5 or 2.8 V, Output is Weakly Pulled Down
–0.40.8
µAST = GND, Vdd = 1.8 V, Output is Weakly Pulled Down
Duty Cycle DC 45 – 55 % All Vdds. f <= 70 MHz
40 – 60 % All Vdds. f >70 MHz
Rise/Fall Time Tr, Tf – 1 2 ns 20% - 80% Vdd=2.5 V, 2.8 V or 3.3 V, 15 pf load
- 1.3 2.5 ns 20% - 80% Vdd=1.8 V, 15 pf load
Output Voltage High VOH 90% – – Vdd IOH = -4 mA (Vdd = 3.3 V)
IOH = -3 mA (Vdd = 2.8 V and 2.5 V)
IOH = -2 mA (Vdd = 1.8 V)
Output Voltage Low
VOL
– – 10 %Vdd IOL = -4 mA (Vdd = 3.3 V)
IOL = -3 mA (Vdd = 2.8 V and 2.5 V)
IOL = -2 mA (Vdd = 1.8 V)
Output Load Ld – – 15 pF At maximum frequency and supply voltage. Contact SiTime for
higher output load option
Input Voltage High VIH 70% – – Vdd Pin 1, OE or ST or SD
Input Voltage Low VIL – – 30% Vdd Pin 1, OE or ST or SD
Startup Time T_start – – 10 ms Measured from the time Vdd reaches its rated minimum value
Resume Time T_resume – 3.0 3.8 ms Measured from the time ST pin crosses 50% threshold
Cycle-to-Cycle Jitter T_cyc – – 26 ps f = 50 MHz, Spread = ON
– – 26 ps f = 50 MHz, Spread = OFF
Rev. 1.7 Page 2 of 9 www.sitime.com
The Smart Timing Choice
The Smart Timing Choice
SiT9003
Low Power Spread Spectrum Oscillator
Notes:
1. In both center spread and down spread modes, triangle modulation is employed with a frequency of ~32 kHz.
2. ±0.5% and -1.0% are available ONLY for <75 MHz in extended commercial temperature range.
Note:
3. In 1.8 V mode, a resistor of <10 kΩ between OE pin and VDD is recommended.
Notes:
4. Test boards compliant with JESD51-3.
5. Test boards compliant with JESD51-7.
6. Referenced to bottom of case.
Spread Spectrum Modes[1]
Center Spread Down Spread
Code BDOQ
Percentage ±0.25% ±0.50%[2] -0.5% -1.0%[2]
Pin Configuration
Pin Symbol Functionality
1ST
/OE/SD
Standby (ST) H or Open[3]: specified frequency output
L: output is low (weak pull down). Oscillator stops
Output Enable (OE) H or Open[3]: specified frequency output
L: output is high impedance.
Spread Disable (SD) H or Open: Spread = ON
L: Spread =OFF
2 GND Ground Connect to Ground
3 CLK Output Clock Output
4 VDD Power Supply
Absolute Maximum
Attempted operation outside the absolute maximum ratings of the part may cause permanent damage to the part. Actual perfor-
mance of the IC is only guaranteed within the operational specifications, not at absolute maximum ratings.
Parameters Min. Max. Unit
Storage Temperature -65 150 °C
VDD -0.5 4 V
Electrostatic Discharge – 2000 V
Soldering Temperature (follow standard Pb free soldering guidelines) – 260 °C
Number of Program Writes –1NA
Program Retention over -40 to 125C, Process, VDD (0 to 3.65V) – 1,000+ years
Thermal Considerations
Package Lead Count Center Pad
Junction-to-Ambient Thermal
Resistance (°C/W)
Junction-to-Case[6]
(bottom)
Thermal Resistance
(°C/W)
4 Layer Board[5] 2 Layer Board[4]
7050 4 Soldered down 43.6 229 2.6
7050 4 Not soldered down 191 263 2.6
7050 4 No center pad 142 273 29.8
5032 4 No center pad 96.8 199 24
3225 4 No center pad 109 212 27
2520 4 No center pad 117 222 26
Top View
14
32
ST/OE/SD VDD
CLKGND
Rev. 1.7 Page 3 of 9 www.sitime.com
The Smart Timing Choice
The Smart Timing Choice
SiT9003
Low Power Spread Spectrum Oscillator
Startup and Resume Timing Diagram
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 Sensibility Level MSL1
50% Vdd
Vdd ST Voltage
CLK Output
T_resume
T_resume: Time to resume from ST
90% Vdd: 2.5/2.8/3.3V parts
95% Vdd: 1.8V parts Vdd Pin 4 Voltage
CLK Output
T_start
T_start: Time to start from power-off
(ST/OE Mode) (ST Mode Only)
Rev. 1.7 Page 4 of 9 www.sitime.com
The Smart Timing Choice
The Smart Timing Choice
SiT9003
Low Power Spread Spectrum Oscillator
Programmable Drive Strength
The SiT9003 includes a programmable drive strength feature
to provide a simple, flexible tool to optimize the clock rise/fall
time for specific applications. Benefits from the programmable
drive strength feature are:
• Improves system radiated electromagnetic interference
(EMI) by slowing down the clock rise/fall time
• Improves the downstream clock receiver’s (RX) jitter by de-
creasing (speeding up) the clock rise/fall time.
• Ability to drive large capacitive loads while maintaining full
swing with sharp edge rates.
For more detailed information about rise/fall time control and
drive strength selection, see the SiTime Applications Note
section; http://www.sitime.com/support/application-notes.
EMI Reduction by Slowing Rise/Fall Time
Figure 1 shows the harmonic power reduction as the rise/fall
times are increased (slowed down). The rise/fall times are
expressed as a ratio of the clock period. For the ratio of 0.05,
the signal is very close to a square wave. For the ratio of 0.45,
the rise/fall times are very close to near-triangular waveform.
These results, for example, show that the 11th clock harmonic
can be reduced by 35 dB if the rise/fall edge is increased from
5% of the period to 45% of the period.
Figure 1. Harmonic EMI reduction as a Function of
Slower Rise/Fall Time
Jitter Reduction with Faster Rise/Fall Time
Power supply noise can be a source of jitter for the
downstream chipset. One way to reduce this jitter is to
increase rise/fall time (edge rate) of the input clock. Some
chipsets would require faster rise/fall time in order to reduce
their sensitivity to this type of jitter. The SiT9003 provides up
to 3 additional high drive strength settings for very fast rise/fall
time. Refer to the Rise/Fall Time Tables to determine the
proper drive strength.
High Output Load Capability
The rise/fall time of the input clock varies as a function of the
actual capacitive load the clock drives. At any given drive
strength, the rise/fall time becomes slower as the output load
increases. As an example, for a 3.3V SiT9003 device with
default drive strength setting, the typical rise/fall time is 1.1ns
for 15 pF output load. The typical rise/fall time slows down to
2.9ns when the output load increases to 45 pF. One can
choose to speed up the rise/fall time to 1.9ns by then
increasing the drive strength setting on the SiT9003.
The SiT9003 can support up to 60 pF or higher in maximum
capacitive loads with up to 3 additional drive strength settings.
Refer to the Rise/Tall Time Tables to determine the proper
drive strength for the desired combination of output load vs.
rise/fall time
SiT9003 Drive Strength Selection
Tables 1 through 4 define the rise/fall time for a given capac-
itive load and supply voltage.
1. Select the table that matches the SiT9003 nominal supply
voltage (1.8V, 2.5V, 2.8V, 3.3V).
2. Select the capacitive load column that matches the appli-
cation requirement (15 pF to 60 pF)
3. Under the capacitive load column, select the desired
rise/fall times.
4. The left-most column represents the part number code for
the corresponding drive strength.
5. Add the drive strength code to the part number for ordering
purposes.
Calculating Maximum Frequency
Based on the rise and fall time data given in Tables 1 through
4, the maximum frequency the oscillator can operate with
guaranteed full swing of the output voltage over temperature
as follows:
Where Trf_20/80 is the typical rise/fall time at 20% to 80%
Vdd
Example 1
Calculate fMAX for the following condition:
• Vdd = 3.3V (Table 1)
• Capacitive Load: 30 pF
• Desired Tr/f time = 1.6ns (rise/fall time part number code =
Z)
Part number for the above example:
SiT9003AIZ14-33EB-105.12345
Drive strength code is inserted here. Default setting is “-”
1357911
-80
-70
-60
-50
-40
-30
-20
-10
0
10
Harmonic number
Harmonic amplitude (dB)
trise=0.05
trise=0.1
trise=0.15
trise=0.2
trise=0.25
trise=0.3
trise=0.35
trise=0.4
trise=0.45
=1
5 x Trf_20/80
Max Frequency
Rev. 1.7 Page 5 of 9 www.sitime.com
The Smart Timing Choice
The Smart Timing Choice
SiT9003
Low Power Spread Spectrum Oscillator
Rise and Fall Time Tables
Table 1. Rise/Fall Times, VDD = 3.3V ±10%, T = 40°C to 85°C
Drive Strength Unit
Load (pF)
15 30 45 60
UMax. ns 2.4 3.5 5.5 6.4
Typ. ns 1.7 2.8 4.3 5.4
x or “–”: Default Max. ns 2.0 2.5 3.9 4.8
Typ. ns 1.1 2.0 2.9 3.8
ZMax. ns 1.2 2.0 3.0 3.7
Typ. ns 0.8 1.6 2.2 2.9
HMax. ns 0.9 1.7 2.5 3.0
Typ. ns 0.6 1.3 1.9 2.3
Table 2. Rise/Fall Times, VDD = 2.8V ±10%, T = 40°C to 85°C
Drive Strength Unit
Load (pF)
15 30 45 60
UMax. ns 2.5 4.1 6.0 7.3
Typ. ns 2.0 3.2 4.8 5.9
XMax. ns 2.2 3.0 4.5 5.4
Typ. ns 1.3 2.2 3.3 4.3
x or “–”: Default Max. ns 2.0 2.4 3.5 4.3
Typ. ns 1.0 1.7 2.5 3.2
HMax. ns 1.2 1.9 2.9 3.6
Typ. ns 0.7 1.5 2.0 2.6
Table 3. Rise/Fall Times, VDD = 2.5V ±10%, T = 40°C to 85°C
Drive Strength Unit
Load (pF)
15 30 45 60
UMax. ns 2.8 4.6 6.8 8.3
Typ. ns 2.1 3.6 5.2 6.4
XMax. ns 2.3 3.3 5.0 5.9
Typ. ns 1.4 2.5 3.7 4.7
x or “–”: Default Max. ns 2.0 2.6 3.4 4.8
Typ. ns 1.1 1.9 2.8 3.6
HMax. ns 1.3 2.2 3.3 4.0
Typ. ns 0.9 1.6 2.3 2.9
Table 4. Rise/Fall Times, VDD = 1.8V ±5%, T = 40°C to 85°C
Drive Strength Unit
Load (pF)
15 30 45 60
UMax. ns 4.2 6.8 9.4 12.1
Typ. ns 3.1 5.1 7.3 9.2
XMax. ns 3.2 4.9 6.9 8.7
Typ. ns 2.3 3.7 5.3 6.5
ZMax. ns 2.7 3.9 5.5 6.7
Typ. ns 1.7 2.9 4.2 5.2
x or “–”: Default Max. ns 2.5 3.3 4.6 5.7
Typ. ns 1.4 2.4 3.4 4.3
Note:
7. All rise/fall times are measured for the thresholds of 20% to 80% of VDD.
Rev. 1.7 Page 6 of 9 www.sitime.com
The Smart Timing Choice
The Smart Timing Choice
SiT9003
Low Power Spread Spectrum Oscillator
Dimensions and Patterns
Package Size – Dimensions (Unit: mm)[8] Recommended Land Pattern (Unit: mm)[9]
2.5 x 2.0 x 0.75 mm
3.2 x 2.5 x 0.75 mm
5.0 x 3.2 x 0.75 mm
7.0 x 5.0 x 0.90 mm
2.5 ± 0.05
2.0 ± 0.05
1.1
1.00
0.75
0.5
0.75 ± 0.05
YXXXX
#1
#2
#4#3
#2
#1
#3#4
1.9
1.1
1.0
1.5
3.2 ± 0.05
2.5 ± 0.05
2.1
0.9
0.7
0.9
0.75 ± 0.05
#1
#2
#4#3
#2
#1
#3#4
YXXXX
2.2
1.9
1.4
1.2
5.0 ± 0.05
3.2 ± 0.05
2.39
0.8
1.15
1.1
0.75 ± 0.05
#1
#2
#4#3
#2
#1
#3#4
YXXXX
2.54
1.5
1.6
2.2
5.0 ± 0.05
1.4
1.1
5.08
7.0 ± 0.05
2.6
0.90 ± 0.10
YXXXX
5.08
3.81
2.2
2.0
Rev. 1.7 Page 7 of 9 www.sitime.com
The Smart Timing Choice
The Smart Timing Choice
SiT9003
Low Power Spread Spectrum Oscillator
Notes:
8. Top marking: Y denotes manufacturing origin and XXXX denotes manufacturing lot number. The value of “Y” will depend on the assembly location of the device.
9. A capacitor of value 0.1 µF between Vdd and GND is required.
Dimensions and Patterns
Package Size – Dimensions (Unit: mm)[8] Recommended Land Pattern (Unit: mm)[9]
7.0 x 5.0 x 0.90 mm (with Center-Pad)
0.90±0.10
Do not Connect the center pad
or
Connect it to Device’s GND
YXXXX
5.08
3.81
2.2
2.0
Rev. 1.7 Page 8 of 9 www.sitime.com
The Smart Timing Choice
The Smart Timing Choice
SiT9003
Low Power Spread Spectrum Oscillator
Ordering Information
The Part No. Guide is for reference only. To customize and build an exact part number, use the SiTime Part Number
Generator.
Available Spread Options vs. Temperature and Frequency
Spread Percentage Temperature Range
C = -20 to 70°C I = -40 to 85°C
B = ±0.25% 1-110 MHz
D = ±0.50% 1-75 MHz –
O = -0.50% 1-110 MHz
Q = -1.0% 1-75 MHz –
Ordering Codes for Supported Tape & Reel Packing Method
Device Size 12 mm T&R (3ku) 12 mm T&R (1ku) 16 mm T&R (3ku) 16 mm T&R (1ku)
2.5 x 2.0 mm T Y – –
3.2 x 2.5 mm T Y – –
5.0 x 3.2 mm T Y – –
7.0 x 5.0 mm – – T Y
Frequency
1.00000 to 110.00000 MHz
Part Family
“SiT9003”
Revision Letter
“A” is the revision
Temperature Range
“I” Industrial, -40 to 85ºC
Supply Voltage
Packaging
Leave Blank for Bulk
Feature Pin
“E” for Output Enable
“S” for Standby
“C” Commercial, -20 to 70ºC
Package Size
“1” 2.5 x 2.0 mm
“2” 3.2 x 2.5 mm
“3” 5.0 x 3.2 mm
“T” and “Y” ordering codes for
appropriate T&R. Please refer to
the table below.
“4” 7.0 x 5.0 mm
(With Center Pad)
SiT9003AC -14-18EB-66. 66600 T
Output Drive Strength
“–” Default (datasheet limits)
See “Drive Strength Settings”
“U”
“X”
“Z”
“H”
Spread Spectrum Percentage
“B” for ±0.25%
Frequency Stability
“3” for ±50 PPM
“4” for ±100 PPM
“D” for Spread Disable
“D” for ±0.50%
“O” for -0.50%
“Q” for -1.0%
“8” 7.0 x 5.0 mm
(Without Center Pad)
“18” for 1.8V
“25” for 2.5V
“28” for 2.8V
“33” for 3.3V
Rev. 1.7 Page 9 of 9 www.sitime.com
© SiTime Corporation 2013. The information contained herein is subject to change at any time without notice. SiTime assumes no responsibility or liability 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
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The Smart Timing Choice
The Smart Timing Choice
Low Power Spread Spectrum Oscillator
SiT9003
Revision History
Version Release Date Change Summary
1.62 8/20/13 Added drive strength settings
1.7 11/18/13 Revised rise and fall time tables, added 7050 package diagram with center pad, add thermal considerations.
