sm843251-156 Micrel Semiconductor, sm843251-156 Datasheet

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sm843251-156

Manufacturer Part Number
sm843251-156
Description
Clockworks 10-gigabit Ethernet, 156.25mhz, Ultra-low Jitter Lvpecl Clock Frequency Synthesizer
Manufacturer
Micrel Semiconductor
Datasheet

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
sm843251-156KA
Manufacturer:
TI
Quantity:
5 669
General Description
The SM843251-156 is a 10-Gigabit Ethernet, 156.25MHz
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 156.25MHz, low-noise, LVPECL output for
Ethernet applications. The crystal reference frequency is
25MHz.
The SM843251-156 is an excellent replacement for IDT
FemtoClocks®, with improved waveform integrity, and
jitter.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
_______________________________________________________________________________________________________
Block Diagram
October 2010
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 (
®
architecture that provides a very stable clock
Features
Applications
• Gigabit Ethernet
• 10-Gigabit Ethernet
408
• Generates a low-noise 156.25MHz LVPECL output
• 2.5V or 3.3V operating voltage
• Typical phase jitter @156.25MHz~110fs
• Crystal frequency: 25MHz
• 156.25MHz output frequency
• Phase Noise @ 156.25MHz:
• Industrial temperature range
• Green-, RoHS-, and PFOS-compliant
• Available in 8-pin TSSOP
156.25MHz, Ultra-Low Jitter LVPECL Clock
(1.875MHz − 20MHz)
− 1kHz:
− 10kHz:
− 100kHz: −135dBc/Hz
− 1MHz:
− 10MHz: −161dBc/Hz
− 20MHz: −166/dBc/Hz
) 944-0800 • fax + 1 (408) 474-1000 •
ClockWorks™
Frequency Synthesizer
SM843251-156
−123dBc/Hz
−130dBc/Hz
−140dBc/Hz
hbwhelp@micrel.com
10-Gigabit Ethernet,
http://www.micrel.com
or (408) 955-1690
M9999-100110-A

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sm843251-156 Summary of contents

Page 1

... The device synthesizes a 156.25MHz, low-noise, LVPECL output for Ethernet applications. The crystal reference frequency is 25MHz. The SM843251-156 is an 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 SM843251-156KA (2) SM843251-156KA TR Notes: 1. Devices are Green-, RoHS-, and PFOS-compliant. 2. Tape and Reel. Pin Configuration Pin Description Pin Number Pin Name 1 V DDA XTAL_OUT 4 XTAL_IN / October 2010 Package Type Operating Range ...

Page 3

... Min. Typ. 2.375 2.50 2.375 2. 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 hbwhelp@micrel.com SM843251-156 Max. Units 3.465 V 3.465 110 mA Max. Units 2.625 V 2.625 100 mA Units M9999-100110-A or (408) 955-1690 ...

Page 4

... Equivalent Series Resistance (ESR) Shunt Capacitor, C0 Correlation Drive Level October 2010 (5) = –40°C to +85°C, unless noted. A Condition 25MHz Crystal Integration Range: 1.875MHz to 20MHz 20% to 80% Condition Min. 12pF Load 4 SM843251-156 Min. Typ. Max. 156.25 110 80 175 350 Typ. Max. Fundamental, Parallel Resonant ...

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 SM843251-156 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 SM843251-156 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 SM843251-156 http://www.micrel.com M9999-100110-A hbwhelp@micrel.com or (408) 955-1690 nt ...

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