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
Supply Voltage
Symbol
Vdd
Min.
2.97
2.25
2.25
Output Frequency Range
Frequency Stability
f
F_stab
1
-10
-20
-25
-50
First Year Aging
10-year Aging
Operating Temperature Range
Input Voltage High
Input Voltage Low
Input Pull-up Impedance
F_aging1
F_aging10
T_use
VIH
VIL
Z_in
-2
-5
-40
-20
70%
–
–
2
Start-up Time
Resume Time
Duty Cycle
Current Consumption
OE Disable Supply Current
Output Disable Leakage Current
Standby Current
Maximum Output Current
Output High Voltage
Output Low Voltage
Output Differential Voltage Swing
Rise/Fall Time
OE Enable/Disable Time
RMS Period Jitter
T_start
T_resume
DC
Idd
I_OE
I_leak
I_std
I_driver
VOH
VOL
V_Swing
Tr, Tf
T_oe
T_jitt
–
–
45
–
–
–
–
–
Vdd-1.1
Vdd-1.9
1.2
–
–
–
–
–
RMS Phase Jitter (random)
T_phj
–
Typ.
3.3
2.5
–
–
–
–
–
–
–
–
–
–
–
–
100
–
6
6
–
61
–
–
–
–
–
–
1.6
300
–
1.2
1.2
1.2
0.6
Max.
3.63
2.75
3.63
220
+10
+20
+25
+50
+2
+5
+85
+70
–
30%
250
–
10
10
55
69
35
1
100
30
Vdd-0.7
Vdd-1.5
2.0
700
115
1.7
1.7
1.7
0.85
Unit
V
V
V
MHz
ppm
ppm
ppm
ppm
ppm
ppm
°C
°C
Vdd
Vdd
kΩ
MΩ
ms
ms
%
mA
mA
A
A
mA
V
V
V
ps
ns
ps
ps
ps
ps
25°C
25°C
Industrial
Extended Commercial
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.
In Standby mode, measured from the time
ST
pin crosses
50% threshold.
Contact SiTime
for tighter duty cycle
Excluding Load Termination Current, Vdd = 3.3V or 2.5V
OE = Low
OE = Low
Inclusive of initial tolerance, operating temperature,
rated power supply voltage, and load variations
Termination schemes in
Figures 1 and 2
- XX ordering code
Condition
LVPECL and LVDS, Common Electrical Characteristics
LVPECL, DC and AC Characteristics
ST
= Low, for all Vdds
Maximum average current drawn from OUT+ or OUT-
See
Figure 1(a)
See
Figure 1(a)
See
Figure 1(b)
20% to 80%, see
Figure 1(a)
f = 212.5 MHz - For other frequencies, T_oe = 100ns + 3 period
f = 100 MHz, VDD = 3.3V or 2.5V
f = 156.25 MHz, VDD = 3.3V or 2.5V
f = 212.5 MHz, VDD = 3.3V or 2.5V
f = 156.25 MHz, Integration bandwidth = 12 kHz to 20 MHz,
all Vdds
Rev 1.08
August 17, 2019
www.sitime.com
SiT9121
1 MHz − 220 MHz High Performance Differential Oscillator
Table 1. Electrical Characteristics
(continued)
Parameter
Current Consumption
OE Disable Supply Current
Differential Output Voltage
Output Disable Leakage Current
Standby Current
Delta VOD
Offset Voltage
Delta VOS
Rise/Fall Time
OE Enable/Disable Time
RMS Period Jitter
T_jitt
RMS Phase Jitter (random)
T_phj
Symbol
Idd
I_OE
VOD
I_leak
I_std
VOD
VOS
VOS
Tr, Tf
T_oe
Min.
–
–
250
–
–
–
1.125
–
–
–
–
–
–
–
Typ.
47
–
350
–
–
–
1.2
–
495
–
1.2
1.2
1.2
0.6
Max.
55
35
450
1
100
50
1.375
50
700
115
1.7
1.7
1.7
0.85
Unit
mA
mA
mV
A
A
mV
V
mV
ps
ns
ps
ps
ps
ps
Condition
Excluding Load Termination Current, Vdd = 3.3V or 2.5V
OE = Low
See
Figure 2
OE = Low
LVDS, DC and AC Characteristics
ST
= Low, for all Vdds
See
Figure 2
See
Figure 2
See
Figure 2
20% to 80%, see
Figure 2
f = 212.5 MHz - For other frequencies, T_oe = 100ns + 3 period
f = 100 MHz, VDD = 3.3V or 2.5V
f = 156.25 MHz, VDD = 3.3V or 2.5V
f = 212.5 MHz, VDD = 3.3V or 2.5V
f = 156.25 MHz, Integration bandwidth = 12 kHz to 20 MHz, all Vdds
Table 2. Pin Description
Pin
Map
NC
1
OE
NA
Input
Input
NA
Power
Output
Output
Power
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
H or Open: specified frequency output
L: Device goes to sleep mode. Supply current reduces to I_std.
No Connect; Leave it floating or connect to GND for better heat
dissipation
VDD Power Supply Ground
Oscillator output
Complementary oscillator output
Power supply voltage
Top View
NC/OE/ST
NC
GND
1
6
VDD
OUT-
OUT+
ST
2
3
4
5
6
NC
GND
OUT+
OUT-
VDD
2
5
3
4
Figure 1. Pin Assignments
Rev 1.08
Page 2 of 13
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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.
Parameter
Storage Temperature
VDD
Electrostatic Discharge (HBM)
Soldering Temperature (follow standard Pb free soldering guidelines)
Min.
-65
-0.5
–
–
Max.
150
4
2000
260
Unit
°C
V
V
°C
Table 4. Thermal Consideration
[1]
Package
7050, 6-pin
5032, 6-pin
3225, 6-pin
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.
JA, 4 Layer Board (°C/W)
142
97
109
JC, Bottom (°C/W)
27
20
20
Table 5. Maximum Operating Junction Temperature
[2]
Max Operating Temperature (ambient)
70°C
85°C
Note:
2. Datasheet specifications are not guaranteed if junction temperature exceeds the maximum operating junction temperature.
Maximum Operating Junction Temperature
90°C
105°C
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 1.08
Page 3 of 13
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SiT9121
1 MHz − 220 MHz High Performance Differential Oscillator
Waveform Diagrams
OUT-
80%
80%
20%
OUT+
20%
VOH
Tr
GND
VOL
Tf
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-)
OUT-
80%
VOD
80%
20%
OUT+
20%
VOS
Tr
GND
Tf
Figure 2. LVDS Voltage Levels per Differential Pin (i.e. OUT+, or OUT-)
Rev 1.08
Page 4 of 13
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SiT9121
1 MHz − 220 MHz High Performance Differential Oscillator
Termination Diagrams
LVPECL
VDD
Z0 = 50
OUT+
LVPECL Driver
OUT-
D+
Receiver Device
Z0 = 50
50
50
D-
VTT = VDD – 2.0 V
Figure 3. LVPECL Typical Termination
VDD
OUT+
VDD= 3.3V => R1 = 100 to 150
VDD= 2.5V => R1 = 75
100 nF
D+
Receiver Device
100 nF
Z0 = 50
LVPECL Driver
OUT-
R1
R1
Z0 = 50
50
50
D-
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
OUT+
LVPECL Driver
OUT-
Z0 = 50
R2
R4
Z0 = 50
VDD
R1
R3
D+
Receiver Device
D-
Figure 5. LVPECL with Thevenin Typical Termination
Rev 1.08
Page 5 of 13
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