Ordering Information .................................................................................................................................................................... 2
User Programming Interface ..................................................................................................................................... 18
Start-up output frequency and signaling types ........................................................................................................... 18
Any-frequency function ............................................................................................................................................. 19
C/SPI Control Registers...................................................................................................................................................... 28
9 I
Register Address: 0x00. DCO Frequency Control Least Significant Word (LSW) .................................................... 28
Register Address: 0x01. OE Control, DCO Frequency Control Most Significant Word (MSW) ................................. 29
Register Address: 0x02. DCO PULL RANGE CONTROL ........................................................................................ 29
Register Address: 0x03. Frac-N PLL Feedback Divider Integer Value and Frac-N PLL Feedback Divider Fraction
Value MSW ............................................................................................................................................................... 30
Register Address: 0x05. Forward Divider, Driver Control ......................................................................................... 30
Register Address: 0x06. Driver Divider, Driver Control ............................................................................................. 31
2
C Operation ........................................................................................................................................................................ 32
10 I
I
2
C protocol ............................................................................................................................................................... 32
I
2
C Timing Specification ............................................................................................................................................ 35
I
2
C Device Address Modes ....................................................................................................................................... 36
Dimensions and Patterns ........................................................................................................................................................... 43
Additional Information ................................................................................................................................................................ 44
Revision History ......................................................................................................................................................................... 45
Rev 1.01
Page 3 of 45
www.sitime.com
SiT3521
1 to 340 MHz Elite Platform I2C/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
Symbol
f
Min.
1
Typ.
–
–
–
–
–
±1
–
–
–
Max.
340
Unit
MHz
Condition
Factory or user programmable, accurate to 6 decimal places
Frequency Range
Frequency Stability
Frequency Stability
F_stab
-10
-20
-25
-50
First Year Aging
F_1y
–
+10
+20
+25
+50
–
ppm
ppm
ppm
ppm
ppm
°C
°C
°C
1
st
-year aging at 25°C
Inclusive of initial tolerance, operating temperature, rated
power supply voltage and load variations.
Temperature Range
Operating Temperature Range
T_use
-20
-40
-40
+70
+85
+105
Supply Voltage
Supply Voltage
Vdd
2.97
2.7
2.52
2.25
3.3
3.0
2.8
2.5
–
–
100
–
–
–
3.63
3.3
3.08
2.75
–
30%
–
V
V
V
V
Extended Commercial
Industrial
Extended Industrial. Available only for I
2
C operation, not SPI.
Input Characteristics – OE Pin
Input Voltage High
Input Voltage Low
Input Pull-up Impedance
VIH
VIL
Z_in
70%
–
–
Vdd
Vdd
kΩ
OE pin
OE pin
OE pin, logic high or logic low
Output Characteristics
Duty Cycle
DC
45
–
–
55
%
Startup and Output Enable/Disable Timing
Start-up Time
Output Enable/Disable Time –
Hardware control via OE pin
Output Enable/Disable Time –
Software control via I
2
C/SPI
T_start
T_oe_hw
3.0
3.8
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 30
and
Figure 31
T_oe_sw
–
–
6.5
µs
Rev 1.01
Page 4 of 45
www.sitime.com
SiT3521
1 to 340 MHz Elite Platform I2C/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
–
–
–
–
–
–
0.15
–
89
58
–
32
mA
mA
A
mA
Excluding Load Termination Current, Vdd = 3.3 V or 2.5 V
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
–
0.225
0.1
0.225
0.11
1
0.340
0.14
0.340
0.15
1.6
ps
ps
ps
ps
ps
f = 156.25 MHz, Integration bandwidth = 12 kHz to 20 MHz,
all Vdd levels
f = 156.25, IEEE802.3-2005 10 GbE jitter mask integration
bandwidth = 1.875 MHz to 20 MHz, all Vdd levels
f = 156.25 MHz, Integration bandwidth = 12 kHz to 20 MHz,
all Vdd levels
f = 156.25, IEEE802.3-2005 10 GbE jitter mask integration
bandwidth = 1.875 MHz to 20 MHz, all Vdd levels
f = 100, 156.25 or 212.5 MHz, Vdd = 3.3 V or 2.5 V
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
80
61
–
mA
mA
A
Excluding Load Termination Current, Vdd = 3.3 V or 2.5 V
OE = Low
OE = Low
Output Characteristics
Differential Output Voltage
Delta VOD
Offset Voltage
Delta VOS
Rise/Fall Time
VOD
ΔVOD
VOS
ΔVOS
Tr, Tf
250
–
1.125
–
–
–
–
–
–
400
455
50
1.375
50
470
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
0.1
0.21
0.1
1
0.275
0.12
0.367
0.12
1.6
ps
ps
ps
ps
ps
f = 156.25 MHz, Integration bandwidth = 12 kHz to 20 MHz,
all Vdd levels
f = 156.25, IEEE802.3-2005 10 GbE jitter mask integration
bandwidth = 1.875 MHz to 20 MHz, all Vdd levels
f = 156.25 MHz, Integration bandwidth = 12 kHz to 20 MHz,
all Vdd levels
f = 156.25, IEEE802.3-2005 10 GbE jitter mask integration
bandwidth = 1.875 MHz to 20 MHz, all Vdd levels
f = 100, 156.25 or 212.5 MHz, Vdd = 3.3 V or 2.5 V
mV
mV
V
mV
ps
f = 156.25MHz See
Figure 7
See
Figure 7
See
Figure 7
See
Figure 7
Measured with 2 pF capacitive loading to GND, 20% to 80%,
There are many definitions like this in ti's assembly language support library: _CNTL_2P2Z_Ref:n: .usect "CNTL_2P2Z_Section",2,1,1
_PWMDRV_1ch_UpDwnCnt_Duty:n: .usect "PWMDRV_1ch_UpDwnCnt_Section",2,1...
I need help from a novice. The displayed time is 1/5 more than the set time. 12MHZ. In timer() 65536-50000 if(x==20){x=0；y++；} main{ } { if(y==20){ y=0；} f(y==0){ } //Display the traffic lightif(y==5)...
Embedded software learning routes and directions, see what you want to learn or what you like, because embedded knowledge is more extensive, you can choose a direction according to your expertise in t...
The routines of the GD32L23x firmware package do not completely match the GD32L23x-START board, and several places need to be modified to adapt.
1. The IO of LED1-4 needs to be modified. The left side...
[size=4]The comparison between GPRS and NB-IoT is more like the comparison between traditional networks and emerging networks. Let's focus on the advantages of GPRS and NB-IoT in the following points....
Mobile phones have become powerful personalized devices that allow users to customize services and information through various applications and functions. This ability to understand users, situations...[Details]
On January 12, 2017, WPG Holdings, a semiconductor component distributor, announced that its subsidiary Pinjia has launched a VR application solution based on Microchip's PIC32MZ series MCU. Microch...[Details]
据新华社消息，南方电网深圳供电局在中国电力行业首次部署应用华为鲲鹏、昇腾处理器生态系统，涵盖操作系统、处理器、服务器和存储等，并自研应用迁移平台，实现该局IDC（信息数据中心）软硬件资源全栈（所有核心软件和硬件）国产化的成功测试。 Lv Zhining, director of the Information Center of Shenzhen Power Supply Bureau, sa...[Details]
0 Introduction
The automobile industry has become a bright spot in the growth of the national economy. With the development of science and technology, automobile testing has gone through stages such...[Details]
When Google's next-generation operating system, Android 10, was just released, Unisoc immediately announced that it had taken the lead in deploying Google's latest operating system on smartphone mobi...[Details]
Today, Apple rolled out iOS 12.5.4 to several older iPhones and iPads, with build number 16H50. Officials said that this update brings important security updates and all users are recommended to in...[Details]
Read ST support document UM0560 carefully and follow the steps. Procedure preparation: 1. Open the serial port receive interrupt and send. /* ******************************************** UART2 c...[Details]
According to relevant data this year, we can see that as the semiconductor winter is coming, Taiwan's semiconductor industry is struggling to find a good way to survive this winter. And the mainland ...[Details]
1 Introduction
A bidirectional DC/DC converter is a DC converter that can adjust the direction of energy transfer as needed to achieve bidirectional flow of electric energy while keepi...[Details]
On February 7, 2023, the first phase of the Huaibei Wanneng Energy Storage Power Station successfully passed the reverse power supply commissioning at one time, indicating that the project has full...[Details]
At this year's SAE Hybrid & Electric Vehicle Technology Symposium in San Diego, Chris Kirby, founder and president of Magnomatics, introduced the company's second-generation MAGSPLIT eCVT compact...[Details]
Introduction: If household heating is burned with coal, it will pollute the environment and be inconvenient. Therefore, it is necessary to develop an easy-to-use, safe and simple electric controlle...[Details]
1 Introduction
The motion control system is an electrical transmission control system that takes the motor, the driving device of mechanical motion, as the control object, takes the co...[Details]
TI Technology Forum
京公网安备 11010802033920号
EEWORLD
