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SIT1618AA-22-33S-25.000000E

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
The Smart Timing Choice
The Smart Timing Choice
SiT1618
Standard Frequency, High Temperature Oscillator
Rev. 1.0 Page 4 of 13 www.sitime.com
Note:
9. SiT1618 has “no runt” pulses and “no glitch” output during startup or resume.
Test Circuit and Waveform
[8]
Figure 2. Test Circuit
Note:
8. Duty Cycle is computed as Duty Cycle = TH/Period.
Figure 3. Waveform
Timing Diagrams
Figure 4. Startup Timing (OE/ST Mode)
Figure 5. Standby Resume Timing (ST Mode Only)
u
Figure 6. OE Enable Timing (OE Mode Only) Figure 7. OE Disable Timing (OE Mode Only)
4
1
3
2
0.1µF
Power
Supply
OE/ST Function
Test
Point
15pF
(including probe
and fixture
capacitance)
Vdd Vout
Vdd
1k
80% Vdd
High Pulse
(TH)
50%
20% Vdd
Period
tftr
Low Pulse
(TL)
90% Vdd Vdd
Pin 4 Voltage
CLK Output
T_start
T_start: Time to start from power-off
No Glitch
during start up
[9]
50% Vdd
Vdd
ST Voltage
CLK Output
T_resume
T_resume: Time to resume from ST
50% Vdd
Vdd
OE Voltage
CLK Output
T_oe
T_oe: Time to re-enable the clock output
50% Vdd
Vdd
OE Voltage
CLK Output
T_oe: Time to put the output in High Z mode
HZ
T_oe
The Smart Timing Choice
The Smart Timing Choice
SiT1618
Standard Frequency, High Temperature Oscillator
Rev. 1.0 Page 5 of 13 www.sitime.com
Performance Plots
[10]
Figure 8. Idd vs Frequency Figure 9. Frequency vs Temperature
Figure 10. RMS Period Jitter vs Frequency Figure 11. Duty Cycle vs Frequency
Figure 12. 20%-80% Rise Time vs Temperature Figure 13. 20%-80% Fall Time vs Temperature
-25
-20
-15
-10
-5
0
5
10
15
20
25
-40-20 0 20406080100120
F
r
e
q
u
e
n
c
y
(
p
p
m
)
Temperature ( C)
DUT 1 DUT 2 DUT 3 DUT 4
DUT 5 DUT 6 DUT 7 DUT 8
DUT 9 DUT 10
Frequency (ppm)
Temperature (°C)
Duty cycle (%)
Frequency (MHz)
45
46
47
48
49
50
51
52
53
54
55
0 1020304050
1.8 V 2.5 V 2.8 V 3. 0 V 3.3 V
Rise time (ns)
Temperature (°C)
0.0
0.5
1.0
1.5
2.0
2.5
-40-20 0 20406080100120
1.8 V 2.5 V 2.8 V 3.0 V 3.3 V
Fall time (ns)
Temperature (°C)
0.0
0.5
1.0
1.5
2.0
2.5
-40 -20 0 20 40 60 80 100 120
1.8 V 2.5 V 2.8 V 3.0 V 3.3 V
The Smart Timing Choice
The Smart Timing Choice
SiT1618
Standard Frequency, High Temperature Oscillator
Rev. 1.0 Page 6 of 13 www.sitime.com
Performance Plots
[10]
Figure 14. RMS Integrated Phase Jitter Random
(12 kHz to 20 MHz) vs Frequency
[11]
Figure 15. RMS Integrated Phase Jitter Random
(900 kHz to 7.5 MHz) vs Frequency
[11]
Notes:
10. All plots are measured with 15 pF load at room temperature, unless otherwise stated.
11. Phase noise plots are measured with Agilent E5052B signal source analyzer. Integration range is up to 5 MHz for carrier frequencies below 40 MHz.
IPJ (ps)
Frequency (MHz)
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
10 15 20 25 30 35 40 45 50
1.8 V 2.5 V 2.8 V 3.0 V 3.3 V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

SIT1618AA-22-33S-25.000000E

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Description:
MEMS OSC XO 25.0000MHZ LVCMOS LV
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