sm843031-01 Micrel Semiconductor, sm843031-01 Datasheet

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sm843031-01

Manufacturer Part Number
sm843031-01
Description
Clockwork 10-gigabit Ethernet, 312.5mhz, Ultra-low Jitter Lvpecl Clock Frequency Synthesizer
Manufacturer
Micrel Semiconductor
Datasheet

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Part Number
Manufacturer
Quantity
Price
Part Number:
sm843031-01KA
Manufacturer:
MICREL
Quantity:
597
General Description
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
with very low noise.
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.
The SM843031-01 is an excellent replacement for IDT
FemtoClocks
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.
October 2010
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 •
®
®
architecture that provides a very stable clock
, with improved waveform integrity, and jitter.
Features
• Generates a low noise LVPECL output
• 2.5V or 3.3V operating range
• Typical phase jitter @ 312.5MHz
• Crystal frequency: 25MHz
• 312.5MHz Output frequency
• Industrial temperature range
• Green-, RoHS-, and PFOS-compliant
• Available in 8-pin TSSOP
Applications
• Gigabit Ethernet
• 10-Gigabit Ethernet
312.5MHz, Ultra-Low Jitter LVPECL Clock
(1.875MHz to 20MHz): 119 fs (typical) @ 3.3V
ClockWorks™ 10-Gigabit Ethernet,
Frequency Synthesizer
SM843031-01
hbwhelp@micrel.com
http://www.micrel.com
or (408) 955-1690
M9999-100110-A

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sm843031-01 Summary of contents

Page 1

... The device synthesizes a 312.5MHz, low-noise, LVPECL output for Ethernet applications. The crystal reference frequency used is 25MHz. The SM843031- excellent replacement for IDT ® FemtoClocks , with improved waveform integrity, and jitter. Data sheets and support documentation can be found on Micrel’ ...

Page 2

... Micrel, Inc. (1) Ordering Information Part Number Package Type SM843031-01KA (2) SM843031-01KA TR Notes: 1. Devices are Green-, RoHS-, and PFOS-compliant. 2. Tape and Reel. Pin Configuration Pin Description Pin Number Pin Name Pin Type 1 V DDA XTAL_OUT O, (SE) 4 XTAL_IN I, (SE /Q0 O, (DIF) ...

Page 3

... Min. Typ. Max. 2.375 2.50 2.625 2.375 2.50 2.625 50 87 Min. Typ. Max. V – 1.145 V – 0.97 V – 0.845 – 1.945 V – 1.77 V – 1.645 0.6 0.8 1.0 M9999-100110-A hbwhelp@micrel.com or (408) 955-1690 SM843031-01 Units 115 mA Units 105 mA Units ...

Page 4

... A Condition Integration Range: 1.875MHz to 20MHz 20% to 80% Condition 12pF Load 4 Min. Typ. 312.5 119 80 175 48 50 Min. Typ. Max. Fundamental, Parallel Resonant 100 300 hbwhelp@micrel.com SM843031-01 Max. Units MHz fs 350 Units MHz Ω M9999-100110-A or (408) 955-1690 ...

Page 5

... Micrel, Inc. October 2010 Figure 1. Duty Cycle Timing Figure 2. All Outputs Rise/Fall Time Figure 3. RMS Phase Noise/Jitter 5 SM843031-01 M9999-100110-A hbwhelp@micrel.com or (408) 955-1690 ...

Page 6

... Micrel, Inc. October 2010 Figure 4. LVPECL Output Load and Test Circuit Figure 5. Crystal Input Interface 6 SM843031-01 M9999-100110-A hbwhelp@micrel.com or (408) 955-1690 ...

Page 7

... 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 October 2010 8-Pin TSSOP (K-8) indemnify Micrel for any damages resulting from such use or sale. © 2010 Micrel, Incorporated. 7 SM843031-01 http://www.micrel.com M9999-100110-A hbwhelp@micrel.com or (408) 955-1690 nt ...

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