Document
SiT8920B
-55°C to +125°C Oscillator
Features
Applications
◼ Frequencies between 1 MHz and 110 MHz accurate to 6 decimal places
◼ Operating temperature from -55°C to 125°C ◼ Supply voltage of 1.8 V or 2.5 V to 3.3 V ◼ Excellent total frequency stability as low as ±20 ppm ◼ Low power consumption of 3.5 mA typical at 1.8 V ◼ 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
◼ Ruggedized equipment in harsh operating environment
Related products for automotive applications. For aerospace and defense applications SiTime recommends using only Endura™ SiT8944.
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
Min.
f
1
Typ.
Max.
Unit
Frequency Range
–
110
MHz
Condition
Refer to Table 13 for the exact list of supported frequencies list of supported frequencies
Frequency Stability
F_stab
Operating Temperature Range Supply Voltage
T_use Vdd
Current Consumption OE Disable Current Standby Current
Duty Cycle Rise/Fall Time Output High Voltage Output Low Voltage
Idd I_od I_std
DC Tr, Tf VOH VOL
Frequency Stability and Aging
-20
–
+20
ppm Inclusive of Initial tolerance at 25°C, 1st year aging at 25°C,
-25
–
+25
ppm and variations over operating temperature, rated power
supply voltage and load (15 pF ±10%).
-30
–
+30
ppm
-50
–
+50
ppm
Operating Temperature Range
-55
–
+125
°C
Supply Voltage and Current Consumption
1.62
1.8
1.98
V
2.25
2.5
2.75
V
2.52
2.8
3.08
V
2.7
3.0
3.3
V
2.97
3.3
3.63
V
2.25
–
3.63
V
–
3.8
4.7
mA No load condition, f = 20 MHz, Vdd = 2.8 V, 3.0 V or 3.3 V
–
3.6
4.5
mA No load condition, f = 20 MHz, Vdd = 2.5 V
–
3.5
4.5
mA No load condition, f = 20 MHz, Vdd = 1.8 V
–
–
4.5
mA Vdd = 2.5 V to 3.3 V, OE = Low, Output in high Z state.
–
–
4.3
mA Vdd = 1.8 V, OE = Low, Output in high Z state.
–
2.6
8.5
A Vdd = 2.8 V to 3.3 V, ST = Low, Output is weakly pulled down
–
1.4
5.5
A Vdd = 2.5 V, ST = Low, Output is weakly pulled down
–
0.6
4.0
A Vdd = 1.8 V, ST = Low, Output is weakly pulled down
LVCMOS Output Characteristics
45
–
55
% All Vdds
–
1.0
2.0
ns Vdd = 2.5 V, 2.8 V, 3.0 V or 3.3 V, 20% - 80%
–
1.3
2.5
ns Vdd = 1.8 V, 20% - 80%
–
1.0
3
ns Vdd = 2.25 V - 3.63 V, 20% - 80%
90%
–
IOH = -4 mA (Vdd = 3.0 V or 3.3 V)
–
Vdd IOH = -3 mA (Vdd = 2.8 V or 2.5 V)
IOH = -2 mA (Vdd = 1.8 V)
IOL = 4 mA (Vdd = 3.0 V or 3.3 V)
–
–
10%
Vdd IOL = 3 mA (Vdd = 2.8 V or 2.5 V)
IOL = 2 mA (Vdd = 1.8 V)
Rev 1.03
1 January 2023
www.sitime.com
SiT8920B -55°C to +125°C Oscillator
Table 1. Electrical Characteristics (continued)
Parameters Input High Voltage Input Low Voltage Input Pull-up Impedance
Startup Time Enable/Disable Time Resume Time
RMS Period Jitter Peak-to-peak Period Jitter RMS Phase Jitter (random)
Symbol
Min.
VIH
70%
VIL
–
Z_in
50
2
T_start
–
T_oe
–
T_resume
–
T_jitt
–
–
T_pk
–
–
T_phj
–
–
Typ.
Max.
Unit
Condition
Input Characteristics
–
–
Vdd Pin 1, OE or ST
–
30%
Vdd Pin 1, OE or ST
87
150
k Pin 1, OE logic high or logic low, or ST logic high
–
–
M Pin 1, ST logic low
Startup and Resume Timing
–
5
ms Measured from the time Vdd reaches its rated minimum value
–
130
ns f = 110 MHz. For other frequencies, T_oe = 100 ns + 3 * clock
periods
–
5
ms Measured from the time ST pin crosses 50% threshold
Jitter
1.6
2.5
ps f = 75 MHz, Vdd = 2.5 V, 2.8 V, 3.0 V or 3.3 V
1.9
3
ps f = 75 MHz, Vdd = 1.8 V
12
20
ps f = 75 MHz, Vdd = 2.5 V, 2.8 V, 3.0 V or 3.3 V
14
25
ps f = 75 MHz, Vdd = 1.8 V
0.5
0.8
ps f = 75 MHz, Integration bandwidth = 900 kHz to 7.5 MHz
1.3
2
ps f = 75 MHz, Integration bandwidth = 12 kHz to 20 MHz
Table 2. Pin Description
Pin
Symbol
Functionality
Output Enable
H[1]: specified frequency output L: output is high impedance. Only output driver is disabled.
H[1]: specified frequency output
1
OE/ST/NC
Standby
L: output is low (weak pull down). Device goes to sleep mode.
Supply current reduces to I_std.
No Connect
Any voltage between 0 and Vdd or Open[1]: Specified frequency output. Pin 1 has no function.
2
GND
Power
Electrical ground
3
OUT
Output
Oscillator output
4
VDD
Power
Power supply voltage[2]
Top View
OE/ST/NC 1
4 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.
.