sm844256_pb61 KB

SM844256
Product Brief
10 Gigabit Ethernet and SONET, High-Performance LVDS Frequency
Synthesizer
Description
and 622.08MHz for SONET applications. The crystal
The SM844256 provides a low-noise timing solution for
reference frequencies used include 25MHz and 19.44Mhz
high speed, high accuracy synthesis of clock signals.
for Ethernet and SONET applications, respectively.
Common applications include SONET, Gigabit Ethernet,
10 Gigabit Ethernet, and similar networking standards.
The SM844256 is an excellent replacement for IDT Femtoclocks, with improved accuracy, power consumption,
Power supplies of either 3.3V or 2.5V are supported, with
waveform integrity, and jitter.
superior jitter and phase noise performance. The device
synthesizes different low noise LVDS output frequencies
Datasheets and support documentation can be found on
such as 125MHz, 156.25MHz, 312.5MHz, and 625MHz for
Micrel’s web site at: www.micrel.com.
Ethernet applications; 77.76MHz, 155.52MHz, 311.04MHz,
____________________________________________________________________________________________________________
Block Diagram
Micrel, Inc. TEL: +1 408.944.0800 FAX: + 1 408.474.1000 http://www.micrel.com
Features
Benefits
Generates six LVDS outputs
Can drive multiple devices in need of a low-noise clock for
various applications, which include Gigabit Ethernet and SONET
applications
2.5V or 3.3V operating range
Provides interface flexibility
Typical phase jitter @ 125MHz
– (1.875MHz to 20MHz): 80 fs (typical) @ 3.3V
Provides superior performance with multiple low phase noise
clock outputs that exceed jitter requirements for various
applications
75MHz to 625MHz output frequencies
Supports a wide range of clock frequencies that include Gigabit
Ethernet and SONET standard frequencies for various
applications
Available in 24-pin TSSOP EPAD
EPAD provides improved power dissipation
Operating supply modes:
– Core/Output
– 3.3V/3.3V, 3.3V/2.5V
Provides interface flexibility
Applications
• SONET
• Gigabit Ethernet
• 10-Gigabit Ethernet
• Infiniband
Corporate Sales Offices
Location
Address
Telephone
Fax
Corporate HQ
2180 Fortune Dr.
Western USA
2180 Fortune Dr.
San Jose, CA 95131 USA
(408) 944-0800
(408) 474-1000
San Jose, CA 95131 USA
(408) 944-0800
(408) 474-1000
Central USA
Eastern USA
2425 N. Central Expressway, Suite 351
Richardson, TX 57080 USA
(972) 393-2533
(408) 474-1210
93 Branch St.
Medford, NJ 08055 USA
(609) 654-0078
(609) 654-0989
Latin America
2425 N. Central Expressway, Suite 351
Richardson, TX 57080 USA
(972) 393-2533
(408) 474-1210
China
No. 2001 & 2002, 20/F, Excellence Times Plaza
4068 Yitian Rd., Futian District Rd.
Shenzhen 518048, P.R. China
+86-755-8302-7618
+86-755-8302-7637
Japan
Queen’s Tower A 14F, 2-3-1, Minato Mirai,
Nishi-Ku, Yokohama-Shi
Kanagawa 220-6014, Japan
+81-45-224-6616
+81-45-224-6716
Korea
4F Manzo 2 Bldg, 198-47, Gungnae-Dong,
Bundang-Ku
Seongnam-City, Kyungki-do,
463-470, Korea
82 (2) 538-2380
82 (2) 538-2381
Singapore/India
7500A Beach Rd., #07-324 The Plaza
Singapore 199591
+65-6291-1318
+65-6291-1332
Taiwan
4F, No. 43 Lane 188, Rueiguang Rd., Neihu District
Taipei, Taiwan, R.O.C.
+866 (2) 8751-0600
+866 (2) 8751-0746
France/
Southern Europe
Les Laurentides
Immeuble Ontario, 3 avenue du Quebec
91140 Villebon sur Yvette,
France
+33 (0) 1.6092.4190
+33 (0) 1.6092.4189
UK/EMEA
1st Floor, 3 Lockside Place, Mill Lane, Newbury,
Berks
United Kingdom RG14 5QS
+44 (1635) 524455`
+44 (1635) 524466
Micrel, Inc. TEL: +1 408.944.0800 FAX: + 1 408.474.1000 http://www.micrel.com
M9999-070810