SiT1618B
Standard Frequency, High Temperature Oscillator
The Smart Timing Choice
The Smart Timing Choice
Features
Applications
33 standard frequencies between 7.3728 MHz and 48 MHz
Supply voltage of 1.8V or 2.5V to 3.3V continuous
Operating temperature from -40°C to 125°C. For -55°C option, refer
to
SiT8920
and
SiT8921
Excellent total frequency stability as low as ±20 ppm
Low power consumption of 3.5 mA typical at 1.8V
LVCMOS/LVTTL compatible output
Industry-standard packages: 2.0 x 1.6, 2.5 x 2.0, 3.2 x 2.5, 5.0 x 3.2,
7.0 x 5.0 mm x mm
Instant samples with
Time Machine II
and
field programmable
oscillators
RoHS and REACH compliant, Pb-free, Halogen-free and
Antimony-free
For AEC-Q100 oscillators, refer to
SiT8924
and
SiT8925
Industrial, medical, automotive, avionics and other high
temperature applications
Industrial sensors, PLC, motor servo, outdoor networking
equipment, medical video cam, asset tracking systems, etc.
Electrical Specifications
Table 1. 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 nominal supply voltage.
Parameters
Output Frequency Range
Symbol
f
Min.
Typ.
Max.
Unit
MHz
Condition
Refer to
Table 13
for the exact list of supported frequencies
Frequency Range
33 standard frequencies between
7.3728 MHz and 48 MHz
-20
-25
-30
-50
Operating Temperature Range
(ambient)
T_use
-40
-40
Vdd
1.62
2.25
2.52
2.7
2.97
2.25
Current Consumption
Idd
–
–
–
OE Disable Current
Standby Current
I_od
I_std
–
–
–
–
–
Duty Cycle
Rise/Fall Time
DC
Tr, Tf
45
–
–
–
Output High Voltage
VOH
90%
–
–
–
–
–
–
1.8
2.5
2.8
3.0
3.3
–
3.8
3.6
3.5
–
–
2.6
1.4
0.6
–
1.0
1.3
1.0
–
+20
+25
+30
+50
+105
+125
1.98
2.75
3.08
3.3
3.63
3.63
4.7
4.5
4.5
4.5
4.3
8.5
5.5
4.0
55
2.0
2.5
3
–
Frequency Stability and Aging
Frequency Stability
F_stab
ppm
ppm
ppm
ppm
°C
°C
V
V
V
V
V
V
mA
mA
mA
mA
mA
A
A
A
%
ns
ns
ns
Vdd
No load condition, f = 20 MHz, Vdd = 2.8V, 3.0V or 3.3V
No load condition, f = 20 MHz, Vdd = 2.5V
No load condition, f = 20 MHz, Vdd = 1.8V
Vdd = 2.5V to 3.3V, OE = Low, Output in high Z state.
Vdd = 1.8V, OE = Low, Output in high Z state.
Vdd = 2.8V to 3.3V, ST = Low, Output is weakly pulled down
Vdd = 2.5V, ST = Low, Output is weakly pulled down
Vdd = 1.8V, ST = Low, Output is weakly pulled down
All Vdds
Vdd = 2.5V, 2.8V, 3.0V or 3.3V, 20% - 80%
Vdd =1.8V, 20% - 80%
Vdd = 2.25V - 3.63V, 20% - 80%
IOH = -4 mA (Vdd = 3.0V or 3.3V)
IOH = -3 mA (Vdd = 2.8V or 2.5V)
IOH = -2 mA (Vdd = 1.8V)
IOL = 4 mA (Vdd = 3.0V or 3.3V)
IOL = 3 mA (Vdd = 2.8V or 2.5V)
IOL = 2 mA (Vdd = 1.8V)
Extended Industrial
Automotive
Inclusive of Initial tolerance at 25°C, 1st year aging at 25°C, and
variations over operating temperature, rated power supply
voltage and load.
Operating Temperature Range
Supply Voltage and Current Consumption
Supply Voltage
LVCMOS Output Characteristics
Output Low Voltage
VOL
–
–
10%
Vdd
SiTime Corporation
Rev. 1.02
990 Almanor Avenue, Sunnyvale, CA 94085
(408) 328-4400
www.sitime.com
Revised June 18, 2015
SiT1618B
Standard Frequency, High Temperature Oscillator
The Smart Timing Choice
The Smart Timing Choice
Table 1. Electrical Characteristics (continued)
Parameters
Input High Voltage
Input Low Voltage
Input Pull-up Impedance
Symbol
VIH
VIL
Z_in
Min.
70%
–
50
2
Startup Time
Enable/Disable Time
Resume Time
RMS Period Jitter
Peak-to-peak Period Jitter
RMS Phase Jitter (random)
T_start
T_oe
T_resume
T_jitt
T_pk
T_phj
–
–
–
–
–
–
–
–
–
Typ.
–
–
87
–
–
–
–
1.6
1.9
12
14
0.5
1.3
Max.
–
30%
150
–
5
162
5
Jitter
2.5
4
20
30
0.8
2
ps
ps
ps
ps
ps
ps
f = 20 MHz, Vdd = 2.5V, 2.8V, 3.0V or 3.3V
f = 20 MHz, Vdd = 1.8V
f = 20 MHz, Vdd = 2.5V, 2.8V, 3.0V or 3.3V
f = 20 MHz, Vdd = 1.8V
f = 40 MHz, Integration bandwidth = 900 kHz to 7.5 MHz
f = 40 MHz, Integration bandwidth = 12 kHz to 20 MHz
Unit
Vdd
Vdd
k
M
ms
ns
ms
Pin 1, OE or ST
Pin 1, OE or ST
Pin 1, OE logic high or logic low, or ST logic high
Pin 1, ST logic low
Measured from the time Vdd reaches its rated minimum value
f = 48 MHz. For other frequencies, T_oe = 100 ns + 3 * clock
periods
Measured from the time ST pin crosses 50% threshold
Condition
Input Characteristics
Startup and Resume Timing
Table 2. Pin Description
Pin
Symbol
Output
Enable
1
OE/ ST/NC
Standby
No Connect
2
3
4
GND
OUT
VDD
Power
Output
Power
H
[1]
:
Functionality
specified frequency output
L: output is high impedance. Only output driver is disabled.
H
[1]
: specified frequency output
L: output is low (weak pull down). Device goes to sleep mode. Supply
current reduces to I_std.
Any voltage between 0 and Vdd or Open
[1]
: Specified frequency
output. Pin 1 has no function.
Electrical ground
Oscillator output
Power supply voltage
[2]
OE/ST/NC
1
4
Top View
VDD
GND
2
3
OUT
Figure 1. Pin Assignments
Notes:
1. In OE or ST mode, a pull-up resistor of 10 kΩ or less is recommended if pin 1 is not externally driven.
If pin 1 needs to be left floating, use the NC option.
2. A capacitor of value 0.1 µF or higher between Vdd and GND is required.
Rev. 1.02
Page 2 of 13
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SiT1618B
Standard Frequency, High Temperature Oscillator
The Smart Timing Choice
The Smart Timing Choice
N
Table 3. Absolute Maximum Limits
Attempted operation outside the absolute maximum ratings may cause permanent damage to the part. Actual performance of the
IC is only guaranteed within the operational specifications, not at absolute maximum ratings.
Parameter
Storage Temperature
Vdd
Electrostatic Discharge
Soldering Temperature (follow standard Pb free soldering guidelines)
Junction Temperature
[3]
Min.
-65
-0.5
–
–
–
Max.
150
4
2000
260
150
Unit
°C
V
V
°C
°C
Note:
3. Exceeding this temperature for extended period of time may damage the device.
Table 4. Thermal Consideration
[4]
Package
7050
5032
3225
2520
2016
JA, 4 Layer Board
(°C/W)
142
97
109
117
152
JA, 2 Layer Board
(°C/W)
273
199
212
222
252
JC, Bottom
(°C/W)
30
24
27
26
36
Note:
4. Refer to JESD51 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
[5]
Max Operating Temperature (ambient)
105°C
125°C
Maximum Operating Junction Temperature
115°C
135°C
Note:
5. Datasheet specifications are not guaranteed if junction temperature exceeds the maximum operating junction temperature.
Table 6. Environmental Compliance
Parameter
Mechanical Shock
Mechanical Vibration
Temperature Cycle
Solderability
Moisture Sensitivity Level
Condition/Test Method
MIL-STD-883F, Method 2002
MIL-STD-883F, Method 2007
JESD22, Method A104
MIL-STD-883F, Method 2003
MSL1 @ 260°C
Rev. 1.02
Page 3 of 13
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SiT1618B
Standard Frequency, High Temperature Oscillator
The Smart Timing Choice
The Smart Timing Choice
Test Circuit and Waveform
[6]
Vdd
Vout
Test
Point
tr
80% Vdd
tf
4
Power
Supply
0.1µF
3
15pF
(including probe
and fixture
capacitance)
50%
20% Vdd
High Pulse
(TH)
Period
Low Pulse
(TL)
1
2
Vdd
OE/ST Function
1k
Figure 2. Test Circuit
Note:
6. Duty Cycle is computed as Duty Cycle = TH/Period.
Figure 3. Waveform
Timing Diagrams
Vdd
90% Vdd
Vdd
50% Vdd
No Glitch
during start up
[7]
Pin 4 Voltage
T_start
ST Voltage
T_resume
CLK Output
HZ
CLK Output
HZ
T_start: Time to start from power-off
T_resume: Time to resume from ST
Figure 4. Startup Timing (OE/ST Mode)
u
Figure 5. Standby Resume Timing (ST Mode Only)
Vdd
50% Vdd
OE Voltage
T_oe
OE Voltage
Vdd
50% Vdd
T_oe
CLK Output
HZ
CLK Output
HZ
T_oe: Time to re-enable the clock output
T_oe: Time to put the output in High Z mode
Figure 6. OE Enable Timing (OE Mode Only)
Note:
7. SiT1618 has “no runt” pulses and “no glitch” output during startup or resume.
Figure 7. OE Disable Timing (OE Mode Only)
Rev. 1.02
Page 4 of 13
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SiT1618B
Standard Frequency, High Temperature Oscillator
The Smart Timing Choice
The Smart Timing Choice
Performance Plots
[8]
1.8 V
5.0
4.8
4.6
2.5 V
2.8 V
3V
3.3 V
DUT1
DUT8
DUT15
DUT22
25
20
DUT2
DUT9
DUT16
DUT23
DUT3
DUT10
DUT17
DUT24
DUT4
DUT11
DUT18
DUT25
DUT5
DUT12
DUT19
DUT6
DUT13
DUT20
DUT7
DUT14
DUT21
Frequency (ppm)
0
5
10
15
20
25
30
35
40
45
50
4.4
15
10
5
0
-5
-10
-15
-20
-25
‐40
‐20
0
20
40
60
80
100
120
Idd (mA)
4.2
4.0
3.8
3.6
3.4
3.2
3.0
Frequency (MHz)
Temperature (°C)
Figure 8. Idd vs Frequency
Figure 9. Frequency vs Temperature
1.8 V
4.0
3.5
2.5 V
2.8 V
3.0 V
3.3 V
55
54
53
1.8 V
2.5 V
2.8 V
3.0 V
3.3 V
RMS period jitter (ps)
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0
10
20
30
40
50
Duty cycle (%)
52
51
50
49
48
47
46
45
0
5
10
15
20
25
30
35
40
45
50
Frequency (MHz)
Frequency (MHz)
Figure 10. RMS Period Jitter vs Frequency
Figure 11. Duty Cycle vs Frequency
1.8 V
2.5
2.5 V
2.8 V
3.0 V
3.3 V
2.5
1.8 V
2.5 V
2.8 V
3.0 V
3.3 V
2.0
2.0
Rise time (ns)
Fall time (ns)
1.5
1.5
1.0
1.0
0.5
0.5
0.0
-40
-20
0
20
40
60
80
100
120
0.0
-40
-20
0
20
40
60
80
100
120
Temperature (°C)
Temperature (°C)
Figure 12. 20%-80% Rise Time vs Temperature
Figure 13. 20%-80% Fall Time vs Temperature
Rev. 1.02
Page 5 of 13
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