115.2 – 137 MHz, -55 to 125°C, Endura™ Series Oscillator
Features
◼
◼
Applications
◼
◼
◼
◼
◼
◼
◼
◼
◼
◼
◼
Best acceleration sensitivity of 0.1 ppb/g
Any frequencies between 115.2 MHz and 137 MHz accurate
to 6 decimal points
100% pin-to-pin drop-in replacement to quartz-based XO
Excellent total frequency stability as low as ±20 ppm
Low power consumption of 3.8 mA typical at 1.8V
LVCMOS/LVTTL compatible output
AEC-Q100 qualified
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
RoHS and REACH compliant, Pb-free, Halogen-free and
Antimony-free
Contact SiTime
for up-screening and LAT programs
Avionics systems
Field communication systems
Telemetry applications
Electrical Characteristics
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.
Parameter
Output Frequency Range
Frequency Stability
Symbol
f
F_stab
Min.
115.20
-20
-25
-30
-50
Operating Temperature
Range (ambient)
T_use
-40
-40
-40
-55
Acceleration (g) sensitivity,
Gamma Vector
Supply Voltage
Current Consumption
F_g
–
Typ.
–
–
–
–
–
–
–
–
–
–
Max.
137
+20
+25
+30
+50
+85
+105
+125
+125
0.1
Unit
MHz
ppm
ppm
ppm
ppm
°C
°C
°C
°C
ppb/g
AEC-Q100 Grade 3
AEC-Q100 Grade 2
AEC-Q100 Grade 1
Extended cold, AEC-Q100 Grade1
Low sensitivity grade; total gamma over 3 axes; 15 Hz to 2 kHz;
MIL-PRF-55310, computed per section 4.8.18.3.1
All voltages between 2.25V and 3.63V including 2.5V, 2.8V, 3.0V and 3.3V
are supported.
Contact SiTime
for 1.5V support
No load condition, f = 125 MHz, Vdd = 2.25V to 3.63V
No load condition, f = 125 MHz, Vdd = 1.62V to 1.98V
Condition
Refer to Tables 13 to 15 for the exact
list of supported frequencies
Inclusive of Initial tolerance at 25°C, 1
st
year aging at 25°C, and
variations over operating temperature, rated power supply voltage
and load (15 pF ± 10%)
Frequency Range
Frequency Stability and Aging
Operating Temperature Range
Rugged Characteristics
Supply Voltage and Current Consumption
Vdd
Idd
1.62
2.25
–
–
Duty Cycle
Rise/Fall Time
Output High Voltage
DC
Tr, Tf
VOH
45
–
–
90%
1.8
–
6
4.9
–
1.5
1.5
–
1.98
3.63
8
6
55
3
2.5
–
V
V
mA
mA
%
ns
ns
Vdd
Vdd = 2.25V - 3.63V, 20% - 80%
Vdd = 1.8V, 20% - 80%
IOH = -4 mA (Vdd = 3.0V or 3.3V)
IOH = -3 mA (Vdd = 2.8V and Vdd = 2.5V)
IOH = -2 mA (Vdd = 1.8V)
IOL = 4 mA (Vdd = 3.0V or 3.3V)
IOL = 3 mA (Vdd = 2.8V and Vdd = 2.5V)
IOL = 2 mA (Vdd = 1.8V)
Pin 1, OE
Pin 1, OE
Pin 1, OE logic high or logic low
LVCMOS Output Characteristics
Output Low Voltage
VOL
–
–
10%
Vdd
Input Characteristics
Input High Voltage
Input Low Voltage
Input Pull-up Impedance
VIH
VIL
Z_in
70%
–
–
–
–
100
–
30%
–
Vdd
Vdd
k
Rev 1.00
July 24, 2020
www.sitime.com
SiT8945B
115.2 – 137 MHz, -55 to 125°C, Endura
™
Series Oscillator
Table 1. Electrical Characteristics
(continued)
Parameter
Startup Time
Enable/Disable Time
Standby Current
Symbol
T_start
T_oe
I_std
Min.
–
–
–
–
–
RMS Period Jitter
Peak-to-peak Period Jitter
RMS Phase Jitter (random)
T_jitt
T_pk
T_phj
–
–
–
–
–
–
Typ.
–
–
2.6
1.4
0.6
1.6
1.8
12
14
0.7
1.5
Max.
5
130
–
–
–
2.5
3
20
30
–
–
Unit
ms
ns
A
A
A
Jitter
ps
ps
ps
ps
ps
ps
f = 125 MHz, 2.25V to 3.63V
f = 125 MHz, 1.8V
PRELIMINARY
Condition
Measured from the time Vdd reaches its rated minimum value
f = 115.20 MHz. For other frequencies, T_oe = 100 ns + 3 * cycles
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
Startup and Resume Timing
f = 125 MHz, Vdd = 2.5V, 2.8V, 3.0V or 3.3V
f = 125 MHz, Vdd = 1.8V
f = 125 MHz, Integration bandwidth = 900 kHz to 7.5 MHz
f = 125 MHz, Integration bandwidth = 12 kHz to 20 MHz
Table 2. Pin Description
Pin
Symbol
Output Enable
1
OE/NC
No Connect
2
3
4
GND
OUT
VDD
Power
Output
Power
Functionality
H
[1]
: specified frequency output
L: output is high impedance. Only output driver is disabled.
Any voltage between 0 and Vdd or Open
[1]
: Specified frequency
output. Pin 1 has no function.
Electrical ground
[2]
Oscillator output
Power supply voltage
[2]
GND
2
Top View
OE/NC
1
4
VDD
3
OUT
Figure 1. Pin Assignments
Notes:
1. In OE mode, a pull-up resistor of 10k 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 1.00
Page 2 of 15
www.sitime.com
SiT8945B
115.2 – 137 MHz, -55 to 125°C, Endura
™
Series Oscillator
PRELIMINARY
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]
Note:
3. Exceeding this temperature for extended period of time may damage the device.
Min.
-65
-0.5
–
–
–
Max.
150
4
2000
260
150
Unit
°C
V
V
°C
°C
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)
85°C
105°C
125°C
Maximum Operating Junction Temperature
93°C
113°C
133°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 1.00
Page 3 of 15
www.sitime.com
SiT8945B
115.2 – 137 MHz, -55 to 125°C, Endura
™
Series Oscillator
Test Circuit and Waveform
Vdd
Vout
Test
Point
PRELIMINARY
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/NC Function
1k
Figure 2. Test Circuit
[6]
Note:
6. Duty Cycle is computed as Duty Cycle = TH/Period.
Figure 3. Waveform
Timing Diagrams
90% Vdd
Vdd
50% Vdd
T_oe
Vdd
Pin 4 Voltage
T_start
No Glitch
during start up
OE Voltage
CLK Output
HZ
CLK Output
HZ
T_start: Time to start from power-off
T_oe: Time to re-enable the clock output
Figure 4. Startup Timing (OE Mode)
[7]
Figure 5. OE Enable Timing (OE Mode Only)
Vdd
OE Voltage
50% Vdd
T_oe
CLK Output
HZ
T_oe: Time to put the output in High Z mode
Figure 6. OE Disable Timing (OE Mode Only)
Note:
7. SiT8945 has “no runt” pulses and “no glitch” output during startup or resume.
Is there anyone checking your temperature at the door of your company? Do you all wear masks and gloves to work? Do you disinfect before entering the company? . . ....
Thanks to Beineng for providing free boards and technical support for this event. Friends who want to play with SAM D51 series MCUs, please take a look.
The ATSAMD51 EVK evaluation board of Beineng is...
The MSP430G2553 used is AD10, which normally has 8 outputs, P1.0-P1.7 is A0-A7
There are seven registers,The reference voltage can be VCC or the internal reference voltage 1.5V or 2.5V
The reference c...
The hardware schematic diagram of AT24C series programming on enhanced PIC experimental board is shown in the figure below. U7 is the 24C02 chip on the experimental board, SDA is connected to the RB5...[Details]
Compared with coal-fired boilers, oil-fired water heaters have the advantages of high thermal efficiency, low pollution, and high degree of automation. They are gradually replacing coal-fired boile...[Details]
"Memory depth" can also be called "sampling depth", "record length" or "number of sampling points". This is an important indicator of an oscilloscope, which indicates the number of acquisition points...[Details]
After two weeks of course design, I have gained a lot of insights, some about microcontrollers, and more about the relationships between people.
I have been engaged in single-chip microcomputer p...[Details]
For Apple, although four iPhone 12 models were launched this year, the supply of different models performed differently. The highest-end version was in short supply, and until now they have no...[Details]
Traditional vector network analyzers (VNAs) usually use the so-called "virtual" method when measuring balanced/differential devices: the network analyzer stimulates the device under test with a single...[Details]
There are two major driving forces for the development of integrated circuits: one is the logic process driven by Moore's dividend, and the other is the specialty process driven by market segmentatio...[Details]
3. Implementation of platform_driver remove, suspend and resume The function of remove is to remove the device from the kernel and release the memory area. This function is called when the module i...[Details]
The hardware of PLC mainly consists of central processing unit (CPU), memory, input unit, output unit, communication interface, expansion interface, power supply, etc., as shown in the figure.
...[Details]
1. Mode 0 and Mode 2
In Mode 0, one bit of data is sent or received per machine cycle, so the baud rate is fixed to 1/12 of the microcontroller clock frequency (i.e., fosc/12), and is not affected b...[Details]
This stereo power amplifier consists of TA20.22 and a few peripheral components.
Its frequency response is from DC to 100kHz: the efficiency is as high as more than 80%, and it only needs a sma...[Details]
Why does a three-phase motor have only three wires?
The so-called three live wires are actually three phase wires. If you want to know why the electric motor (three-phase) needs to be connecte...[Details]
A system that uses wireless LAN (Wi-Fi) to control LED lighting in offices and stores one by one. Specifically, a small power supply circuit and a wireless communication module are built into each fl...[Details]
On October 23, Bloomberg reported today that Arm plans to cancel the license that allows its long-term partner Qualcomm to use Arm intellectual property to design chips.
Documents obtained by ...[Details]
Analog electronics
京公网安备 11010802033920号
EEWORLD
