Ordering Information .................................................................................................................................................................... 2
7.1. User Programming Interface .................................................................................................................................... 19
7.2. Start-up output frequency and signaling types ......................................................................................................... 19
8.1. Any-frequency function ............................................................................................................................................ 20
9 I C/SPI Control Registers ..................................................................................................................................................... 29
9.1. Register Address: 0x00. DCO Frequency Control Least Significant Word (LSW) ................................................... 29
9.2. Register Address: 0x01. OE Control, DCO Frequency Control Most Significant Word (MSW) ................................ 30
9.3. Register Address: 0x02. DCO PULL RANGE CONTROL........................................................................................ 31
9.4. Register Address: 0x03. Flac-N PLL Integer Value and Flac-N PLL Fraction MSW ................................................ 32
9.6. Register Address: 0x05. PostDiv, Driver Control ..................................................................................................... 33
9.7. Register Address: 0x06. mDriver, Driver Control ..................................................................................................... 34
2
10 I C Operation ........................................................................................................................................................................ 35
10.1. I
2
C protocol .............................................................................................................................................................. 35
10.2. I
2
C Timing Specification ........................................................................................................................................... 37
Dimensions and Patterns ........................................................................................................................................................... 45
Additional Information ................................................................................................................................................................ 46
Revision History ......................................................................................................................................................................... 47
Rev 0.5
Page 3 of 47
www.sitime.com
SiT3542
340 to 725 MHz Endura Series I
2
C/SPI Programmable Oscillator
1 Electrical Characteristics
All Min and Max limits in the Electrical Characteristics tables are specified over temperature and rated operating voltage with
standard output terminations shown in the termination diagrams. Typical values are at 25°C and nominal supply voltage.
Table 1. Electrical Characteristics – Common to LVPECL, LVDS and HCSL
Parameter
Output Frequency Range
Frequency Stability
Symbol
f
F_stab
Min.
340.000001
-20
-20
-25
-50
First Year Aging
10 Year Aging
20 Year Aging
Operating Temperature Range
F_1y
F_10y
F_20y
T_use
-0.7
-1.4
-1.6
-20
-40
Typ.
–
–
–
–
–
±0.4
±0.8
±1.0
–
–
Max.
725.000000
+20
+20
+25
+50
+0.7
+1.4
+1.6
+70
+85
Unit
MHz
ppm
ppm
ppm
ppm
ppm
ppm
ppm
°C
°C
At 85°C
At 85°C
At 85°C
Extended Commercial
Industrial.
Contact SiTime
for higher temperature range options
Low sensitivity grade; total gamma over 3 axes; 15 Hz to
2 kHz; MIL-PRF-55310, computed per section 4.8.18.3.1
Condition
Factory or user programmable, accurate to 6 decimal places
Inclusive of initial tolerance, operating temperature, rated
power supply voltage and load variations.
Frequency Range
Frequency Stability
Temperature Range
Rugged Characteristics
Acceleration (g) sensitivity,
Gamma Vector
Supply Voltage
F_g
–
–
0.1
Supply Voltage
Vdd
2.97
2.7
2.52
2.25
Input Voltage High
Input Voltage Low
Input Pull-up Impedance
Duty Cycle
Start-up Time
Output Enable/Disable Time –
Hardware control vis OE pin
Output Enable/Disable Time –
Software control vis I
2
C/SPI
T_oe_sw
11.8
µs
VIH
VIL
Z_in
DC
T_start
T_oe_hw
70%
–
–
45
–
–
3.3
3.0
2.8
2.5
–
–
100
–
–
–
3.63
3.3
3.08
2.75
–
30%
–
55
3.0
9.1
V
V
V
V
Vdd
Vdd
kΩ
%
ms
µs
Measured from the time Vdd reaches its rated minimum value
Measured from the time OE pin reaches rated VIH and VIL to
the time clock pins reach 90% of swing and high-Z.
See
Figure 9
and
Figure 10
Measured from the time the last byte of command is
transmitted via I
2
C/SPI (reg1) to the time clock pins reach 90%
of swing and high-Z. See
Figure 31
and
Figure 32
OE pin
OE pin
OE pin, logic high or logic low
ppb/g
Input Characteristics – OE Pin
Output Characteristics
Startup and Output Enable/Disable Timing
Rev 0.5
Page 4 of 47
www.sitime.com
SiT3542
340 to 725 MHz Endura Series I
2
C/SPI Programmable Oscillator
Table 2. Electrical Characteristics – LVPECL Specific
Parameter
Symbol
Min.
Typ.
Max.
Unit
Condition
Current Consumption
Current Consumption
OE Disable Supply Current
Output Disable Leakage Current
Maximum Output Current
Idd
I_OE
I_leak
I_driver
–
–
–
–
–
–
0.10
–
94
63
–
30
mA
mA
A
mA
Excluding Load Termination Current, Vdd = 3.3V or 2.5V
OE = Low
OE = Low
Maximum average current drawn from OUT+ or OUT-
Output Characteristics
Output High Voltage
Output Low Voltage
Output Differential Voltage Swing
Rise/Fall Time
VOH
VOL
V_Swing
Tr, Tf
Vdd - 1.1V
Vdd - 1.9V
1.2
–
–
–
1.6
225
Vdd - 0.7V
Vdd - 1.5V
2.0
290
Jitter
RMS Phase Jitter (random) –
DCO Mode Only
T_phj
–
–
RMS Phase Jitter (random) –
Any-frequency Mode Only
T_phj
–
–
RMS Period Jitter
[3]
Note:
3. Measured according to JESD65B
T_jitt
–
0.22
0.075
0.23
0.09
1
0.260
0.085
0.325
0.095
1.6
ps
ps
ps
ps
ps
f = 622.08 MHz, Integration bandwidth = 12 kHz to 20 MHz,
all Vdds
f = 622.08, IEEE802.3-2005 10GbE jitter mask integration
bandwidth = 1.875 MHz to 20 MHz, all Vdds
f = 622.08 MHz, Integration bandwidth = 12 kHz to 20 MHz,
all Vdd levels
f = 622.08, IEEE802.3-2005 10GbE jitter mask integration
bandwidth = 1.875 MHz to 20 MHz, all Vdd levels
f = 622.08 MHz, Vdd = 3.3V or 2.5V
V
V
V
ps
See
Figure 5
See
Figure 5
See
Figure 6
20% to 80%, see
Figure 6
Table 3. Electrical Characteristics – LVDS Specific
Parameter
Symbol
Min.
Typ.
Max.
Unit
Condition
Current Consumption
Current Consumption
OE Disable Supply Current
Output Disable Leakage Current
Idd
I_OE
I_leak
–
–
–
–
–
0.15
89
67
–
mA
mA
A
Excluding Load Termination Current, Vdd = 3.3V or 2.5V
OE = Low
OE = Low
Output Characteristics
Differential Output Voltage
VOD Magnitude Change
Offset Voltage
VOS Magnitude Change
Rise/Fall Time
VOD
ΔVOD
VOS
ΔVOS
Tr, Tf
250
–
1.125
–
–
–
–
–
–
340
530
50
1.375
50
460
Jitter
RMS Phase Jitter (random) –
DCO Mode Only
T_phj
–
–
RMS Phase Jitter (random) –
Any-frequency Mode Only
T_phj
–
–
RMS Period Jitter
[4]
Note:
4. Measured according to JESD65B
T_jitt
–
0.21
0.060
0.21
0.070
1
0.255
0.070
0.320
0.80
1.6
ps
ps
ps
ps
ps
f = 622.08 MHz, Integration bandwidth = 12 kHz to 20 MHz,
all Vdds
f = 622.08 MHz, IEEE802.3-2005 10GbE jitter mask
integration bandwidth = 1.875 MHz to 20 MHz, all Vdd levels
f = 622.08 MHz, Integration bandwidth = 12 kHz to 20 MHz,
all Vdd levels
f = 622.08 MHz, IEEE802.3-2005 10GbE jitter mask
integration bandwidth = 1.875 MHz to 20 MHz, all Vdd levels
f = 622.08 MHz, Vdd = 3.3V or 2.5V
mV
mV
V
mV
ps
f = 622.08 MHz. See
Figure 7
See
Figure 7
See
Figure 7
See
Figure 7
Measured with 2 pF capacitive loading to GND, 20% to 80%,
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