SM843031-01KA-TR [MICROCHIP]
312.5MHz, OTHER CLOCK GENERATOR, PDSO8;
| 型号： | SM843031-01KA-TR |
| 厂家： | 
MICROCHIP |
| 描述： | 312.5MHz, OTHER CLOCK GENERATOR, PDSO8 时钟 光电二极管 外围集成电路 晶体 |
| 文件： | 总7页 (文件大小：296K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SM843031-01
ClockWorks™ 10-Gigabit Ethernet,
312.5MHz, Ultra-Low Jitter LVPECL Clock
Frequency Synthesizer
General Description
Features
The SM843031-01 is a 10-Gigabit Ethernet, 312.5MHz
LVPECL clock frequency synthesizer and a member of the
ClockWorks™ family of devices from Micrel. It provides a
low-noise timing solution for high-speed, high-accuracy
synthesis of clock signals. It includes a patented
RotaryWave® architecture that provides a very stable clock
with very low noise.
• Generates a low noise LVPECL output
• 2.5V or 3.3V operating range
• Typical phase jitter @ 312.5MHz
(1.875MHz to 20MHz): 119 fs (typical) @ 3.3V
• Crystal frequency: 25MHz
• 312.5MHz Output frequency
• Industrial temperature range
• Green-, RoHS-, and PFOS-compliant
• Available in 8-pin TSSOP
Power supplies of either 2.5V or 3.3V are supported, with
superior jitter and phase noise performance. The device
synthesizes a 312.5MHz, low-noise, LVPECL output for
Ethernet applications. The crystal reference frequency
used is 25MHz.
Applications
The SM843031-01 is an excellent replacement for IDT
FemtoClocks®, with improved waveform integrity, and jitter.
• Gigabit Ethernet
• 10-Gigabit Ethernet
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
_________________________________________________________________________________________________________________________
Block Diagram
ClockWorks is a trademark of Micrel, Inc.
RotaryWave is a registered trademark of Multigig, Inc.
FemtoClocks is a registered trademark of IDT, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
M9999-100110-A
October 2010
hbwhelp@micrel.com or (408) 955-1690
Micrel, Inc.
SM843031-01
Ordering Information(1)
Part Number
SM843031-01KA
SM843031-01KA TR(2)
Notes:
Package Type
Operating Range
Industrial
Package Marking
K-8
K-8
843031-01
843031-01
Industrial
1. Devices are Green-, RoHS-, and PFOS-compliant.
2. Tape and Reel.
Pin Configuration
8-Pin TSSOP (K-8)
(Top View)
Pin Description
Pin Number
Pin Name
VDDA
Pin Type
PWR
Pin Level
Pin Function
1
2
3
4
5
6
7
8
Analog 2.5V or 3.3V Power Supply. No filter resistor needed.
Ground.
VEE
PWR
XTAL_OUT
XTAL_IN
NC
O, (SE)
I, (SE)
−
12pF crystal Crystal Reference Output, no load caps needed.
12pF crystal Crystal Reference Input, no load caps needed.
No Connect
/Q0
O, (DIF)
O, (DIF)
PWR
LVPECL
LVPECL
Differential Clock Output
Differential Clock Output
2.5V or 3.3V Power Supply
Q0
VDD
M9999-100110-A
October 2010
2
hbwhelp@micrel.com or (408) 955-1690
Micrel, Inc.
SM843031-01
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Voltage (VDDA, VDD,) ........................................+4.6V
Supply Voltage (VDD, VDDA)................... +2.375V to +3.465V
Ambient Temperature (TA) ..........................–40°C to +85°C
Junction Thermal Resistance
Input Voltage (VIN)...............................−0.50V to VDD + 0.5V
LVPECL Output Current (IOUT
)
Continuous............................................................50mA
Surge ..................................................................100mA
Lead Temperature (soldering, 20sec.)....................... 260°C
Case Temperature ..................................................... 115°C
Storage Temperature (Ts) .........................−65°C to +150°C
TSSOP (θJA)(Still Air).......................................141°C/W
DC Electrical Characteristics(3)
VDD = VDDA = 3.3V ±5%; TA = –40°C to +85°C, unless noted.
Symbol
VDD
Parameter
Core Supply Voltage
Analog Supply Voltage
Analog Supply Current
Total Supply Current
Condition
Min.
3.135
3.135
Typ.
3.30
3.30
50
Max.
3.465
3.465
60
Units
V
VDDA
IDDA
V
Included in IEE
No load
mA
mA
IEE
95
115
VDD = VDDA = 2.5V ±5%; TA = –40°C to +85°C, unless noted.
Symbol
VDD
Parameter
Condition
Min.
2.375
2.375
Typ.
2.50
2.50
50
Max.
2.625
2.625
60
Units
V
Core Supply Voltage
Analog Supply Voltage
Analog Supply Current
Total Supply Current
VDDA
IDDA
V
Included in IEE
No load
mA
mA
IEE
87
105
LVPECL DC Electrical Characteristics(3, 4)
VDD = VDDA = 2.5V ±5% or 3.3V ±5%, TA = –40°C to +85°C, unless noted.
Symbol
VOH
Parameter
Output High Voltage
Condition
Min.
Typ.
Max.
Units
50Ω to VDD-2V
50Ω to VDD-2V
VDD – 1.145
VDD – 1.945
0.6
VDD – 0.97
VDD – 1.77
0.8
VDD – 0.845
VDD – 1.645
1.0
V
V
V
VOL
Output Low Voltage
VSWING
Notes:
Peak-to-Peak Output Voltage Swing
1. Permanent device damage may occur if absolute maximum ratings are exceeded. This is a stress rating only and functional operation is not implied
at conditions other than those detailed in the operational sections of this data sheet. Exposure to absolute maximum rating conditions for extended
periods may affect device reliability.
2. The data sheet limits are not guaranteed if the device is operated beyond the operating ratings.
3. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established with a transverse
airflow greater than 500 lfpm..
4. See Figure 4 for load test circuit example.
M9999-100110-A
October 2010
3
hbwhelp@micrel.com or (408) 955-1690
Micrel, Inc.
SM843031-01
AC Electrical Characteristics(5)
VDD = VDDA = 2.5V ±5% or 3.3V ±5%, TA = –40°C to +85°C, unless noted.
Symbol
FOUT
Parameter
Output Frequency
RMS Phase Jitter (Output = 312.5 MHz) Integration Range: 1.875MHz to 20MHz
Condition
Min.
Typ.
312.5
119
Max.
Units
MHz
fs
tJITTER
tR, tF
Output Rise/Fall Time
Output Duty Cycle
20% to 80%
80
48
175
350
52
ps
ODC
50
%
Note:
5. The circuit is designed to meet the AC specifications shown in the above table(s) after thermal equilibrium has been established with a transverse
airflow greater than 500 lfpm.
Crystal Characteristics
Parameter
Condition
Min.
Typ.
Max.
Units
Mode of Oscillation
Frequency
12pF Load
Fundamental, Parallel Resonant
25
MHz
Ω
Equivalent Series Resistance (ESR)
Shunt Capacitor, C0
Correlation Drive Level
50
3
7
pF
100
300
uW
M9999-100110-A
October 2010
4
hbwhelp@micrel.com or (408) 955-1690
Micrel, Inc.
SM843031-01
Figure 1. Duty Cycle Timing
Figure 2. All Outputs Rise/Fall Time
Figure 3. RMS Phase Noise/Jitter
M9999-100110-A
October 2010
5
hbwhelp@micrel.com or (408) 955-1690
Micrel, Inc.
SM843031-01
Figure 4. LVPECL Output Load and Test Circuit
Figure 5. Crystal Input Interface
M9999-100110-A
October 2010
6
hbwhelp@micrel.com or (408) 955-1690
Micrel, Inc.
SM843031-01
Package Information
8-Pin TSSOP (K-8)
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com
Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This
information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry,
specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual
property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability
whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties
relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product
can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant
into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A
Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully
indemnify Micrel for any damages resulting from such use or sale.
© 2010 Micrel, Incorporated.
M9999-100110-A
October 2010
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