1 – 110 MHz, -55 to 125°C, Endura™ Series Oscillator
Features
Applications
Best acceleration sensitivity of 0.1 ppb/g
Any frequencies between 1 MHz and 110 MHz accurate to
6 decimal places
Extended temperature range (-55°C to 125°C)
Excellent total frequency stability as low as ±20 ppm
Supply voltage of 1.8V or 2.25V to 3.63V
Low power consumption of 3.8 mA typical at 1.8V
Standby mode for longer battery life
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
[1,2]
All Min and Max limits are specified over temperature and rated operating voltage with 15 pF output load unless otherwise sta ted.
Typical values are at 25°C and nominal supply voltage.
Parameters
Output Frequency Range
Symbol
f
Min.
1
Typ.
–
–
–
–
–
–
–
–
–
–
Max.
110
Unit
MHz
Condition
Refer to Tables 13 to 15 for a
list supported frequencies
Frequency Range
Frequency Stability and Aging
Frequency Stability
F_stab
-20
-25
-30
-50
+20
+25
+30
+50
ppm
ppm
ppm
ppm
Inclusive of Initial tolerance at 25°C, 1st year aging at 25°C,
and variations over operating temperature, rated power
supply voltage and load (15 pF ± 10%)
Operating Temperature Range
Operating Temperature
Range (ambient)
T_use
-40
-40
-40
-55
–
+85
+105
+125
+125
°C
°C
°C
°C
AEC-Q100 Grade 3
AEC-Q100 Grade 2
AEC-Q100 Grade 1
Extended cold AEC-Q100 Grade1
Rugged Characteristics
Acceleration (g) sensitivity,
Gamma Vector
F_g
0.1
ppb/g
Low sensitivity grade; total gamma over 3 axes; 15 Hz to 2 kHz;
MIL-PRF-55310, computed per section 4.8.18.3.1
Supply Voltage and Current Consumption
Supply Voltage
Vdd
1.62
2.25
Current Consumption
Idd
–
–
OE Disable Current
I_od
–
–
Standby Current
I_std
–
–
–
1.8
–
4.0
3.8
–
–
2.6
1.4
0.6
1.98
3.63
4.8
4.5
4.5
4.3
–
–
–
V
V
mA
mA
mA
mA
A
A
A
All voltages between 2.25V and 3.63V including 2.5V, 2.8V, 3.0V
and 3.3V are supported
No load condition, f = 20 MHz, Vdd = 2.25V to 3.63V
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
Rev 0.5
July 23, 2019
www.sitime.com
SiT8944B
1 – 110 MHz, -55 to 125°C, Endura™ Series Oscillator
Table 1. Electrical Characteristics
[1,2]
(continued)
Parameters
Duty Cycle
Rise/Fall Time
Symbol
DC
Tr, Tf
Min.
45
–
–
Output High Voltage
VOH
90%
Typ.
–
1.5
1.3
–
Max.
55
3
2.5
–
Unit
%
ns
ns
Vdd
All Vdd levels
PRELIMINARY
Condition
LVCMOS Output Characteristics
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 or
ST
Pin 1, OE or
ST
Pin 1, OE logic high or logic low, or
ST
logic high
Pin 1,
ST
logic low
Output Low Voltage
VOL
–
–
10%
Vdd
Input High Voltage
Input Low Voltage
Input Pull-up Impedance
VIH
VIL
Z_in
70%
–
–
2
–
–
100
–
Input Characteristics
–
Vdd
30%
–
–
Vdd
k
M
Startup and Resume Timing
Startup Time
Enable/Disable Time
Resume Time
T_start
T_oe
T_resume
–
–
–
–
–
–
5.5
130
5
Jitter
RMS Period Jitter
T_jitt
–
–
RMS Phase Jitter (random)
T_phj
–
–
1.6
1.9
0.5
1.3
2.5
3.0
–
–
ps
ps
ps
ps
f = 75 MHz, 2.25V to 3.63V
f = 75 MHz, 1.8V
f = 75 MHz, Integration bandwidth = 900 kHz to 7.5 MHz
f = 75 MHz, Integration bandwidth = 12 kHz to 20 MHz
ms
ns
ms
Measured from the time Vdd reaches its rated minimum value
f = 110 MHz. For other frequencies, T_oe = 100 ns + 3 * cycles
Measured from the time
ST
pin crosses 50% threshold
Notes:
1. All electrical specifications in the above table are specified with 15 pF output load and for all Vdd(s) unless otherwise stated.
2. The typical value of any parameter in the Electrical Characteristic table is specified for the nominal value of the highest voltage option for that parameter
and at 25°C temperature.
Table 2. Pin Description
Pin
Symbol
[3]
Functionality
Output Enable
H : specified frequency output
L: output is high impedance. Only output driver is disabled.
H
[3]
: 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
[3]
: Specified frequency
output. Pin 1 has no function.
Electrical ground
[4]
Oscillator output
Power supply voltage
[4]
Top View
OE/ST/NC
1
4
VDD
1
OE/
ST
/NC
Standby
No Connect
GND
2
3
OUT
2
3
4
Notes:
GND
OUT
VDD
Power
Output
Power
Figure 1. Pin Assignments
3. 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.
4. A capacitor of value 0.1 µF or higher between Vdd and GND is required.
Rev 0.5
Page 2 of 15
www.sitime.com
SiT8944B
1 – 110 MHz, -55 to 125°C, Endura™ Series Oscillator
Table 3. Absolute Maximum Limits
PRELIMINARY
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
[5]
Min.
-65
-0.5
–
–
–
Max.
150
4
2000
260
150
Unit
°C
V
V
°C
°C
Note:
5. Exceeding this temperature for extended period of time may damage the device.
Table 4. Thermal Consideration
[6]
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:
6. 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
[7]
Max Operating Temperature (ambient)
85°C
105°C
125°C
Maximum Operating Junction Temperature
95°C
115°C
135°C
Note:
7. 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 0.5
Page 3 of 15
www.sitime.com
SiT8944B
1 – 110 MHz, -55 to 125°C, Endura™ Series Oscillator
Test Circuit and Waveform
Vdd
Vout
Test
Point
PRELIMINARY
tr
4
Power
Supply
0.1µF
3
tf
80% Vdd
1
2
15pF
(including probe
and fixture
capacitance)
50%
20% Vdd
High Pulse
(TH)
Period
Low Pulse
(TL)
Vdd
OE/NC Function
1k
Figure 2. Test Circuit
[8]
Note:
8. Duty Cycle is computed as Duty Cycle = TH/Period.
Figure 3. Waveform
[8]
Timing Diagrams
90% Vdd
Vdd
Vdd
50% Vdd
Pin 4 Voltage
T_start
No Glitch
during start up
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)
[9]
Vdd
50% Vdd
T_oe
OE Voltage
Figure 5. Standby Resume Timing (
ST
Mode Only)
Vdd
OE Voltage
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:
9. SiT8944 has “no runt” pulses and “no glitch” output during startup or resume.
Figure 7. OE Disable Timing (OE Mode Only)
Rev 0.5
Page 4 of 15
www.sitime.com
SiT8944B
1 – 110 MHz, -55 to 125°C, Endura™ Series Oscillator
I created a Config.vol volume, which has a database and only two fields (SYS_OID, BK_OID). When there are no records in the database, I directly write values to these two fields, and there is no probl...
Does anyone know where to find the latest ZigBee specification? I have only found the ZigBee-2007 specification. Is this the latest one? Can anyone answer this question? Thanks!...
At the Canton Fair, Chinese people think about how to make sentences and what tenses to use, while foreigners are racking their brains to lower prices. Negotiations in English require absolute languag...
The company has had fewer orders recently and the profits are not good. The company has made a move on its employees: fines for all mistakes, but no rewards for excellence. Damn it, no matter how hard...
I recently asked experts how to learn by myself. Everyone said that I should practice by myself. So I searched for winmobile related software on the Internet, hoping to find inspiration. I found many ...
[color=#333333][font=宋体][size=3]Working principle: The working principle of the forward circuit is that the primary side transfers energy to the secondary side through the transformer during D. In add...
Analog engineers have traditionally struggled with complexity when designing power supplies that required multiple outputs, dynamic load sharing, hot-swap, or extensive fault-handling capabilities....[Details]
System design is a complex process. It is not enough to just use ICs. There are many details to consider. This article uses a high-fidelity music playback system as an example to introduce how to s...[Details]
The reason for the light decay of white LEDs: the decline of phosphor performance
So far, the rapid decline of the luminous performance of white light LEDs, especially low-power white light LE...[Details]
5. Identifiers and keywords of C language
A complete PIC microcontroller C language program usually consists of six parts: include files (i.e. header files 1, variable definitions, variable de...[Details]
Abstract: In recent years, with the establishment and grid-connected power generation of a large number of solar photovoltaic power stations at home and abroad, photovoltaic grid-connected inverter...[Details]
In the "digital pressure measurement" experimental device of applied physics, the subject technical knowledge of analog circuits, digital circuits, sensors and single-chip microcomputers is used. In o...[Details]
People who often surf the Internet until late at night, their families always complain that turning on the big lights in the living room affects their rest, but some people don't have keyboard ligh...[Details]
At present,
the control system used in
automobiles
can be divided into three parts from the functional point of view:
sensor
unit, control unit and execution unit. Among them,
th...[Details]
1 Introduction
CAN (Controller Area Network) bus is a kind of field bus. It is used in many industrial sectors due to its outstanding advantages such as high performance, high reliability, high...[Details]
The number of timers/counters and interrupt sources directly determines the performance of the microcontroller. The MCS-51 microcontroller has two programmable 16-bit timers/counters and five inter...[Details]
Stepper motors, also called steppers, use the principles of electromagnetism to convert electrical energy into mechanical energy and have been used since the 1920s. With the increasing popularity o...[Details]
1 Causes of problems with electric vehicle batteries
1.1 Caused by the battery itself
Why do we say that? In the previous issue, we learned about the working princi...[Details]
Lithium iron phosphate batteries are used as lithium-ion secondary batteries. Their main application is now in power batteries, which have great advantages over NI-H and Ni-Cd batteries.
Lithi...[Details]
With the continuous development of integrated circuit technology, integrated circuits have developed from thousands of gates to the current level of millions and tens of millions of gates. The applica...[Details]
SL11R is a 16-bit RISC microcontroller with a USB interface produced by Scanlogic. Its core processing speed reaches 48MIPS. It has rich hardware resources and 32-bit programmable I/O ports, and ca...[Details]
Embedded System
京公网安备 11010802033920号
EEWORLD
