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參數(shù)資料
| 型號(hào)： | SM844256KA |
| 廠商： | Micrel Inc |
| 文件頁(yè)數(shù)： | 1/8頁(yè) |
| 文件大小： | 0K |
| 描述： | IC SYNTHESIZER LVDS 24-TSSOP |
| 產(chǎn)品培訓(xùn)模塊： | High Bandwidth Product Overview |
| 標(biāo)準(zhǔn)包裝： | 62 |
| 系列： | RotaryWave™ |
| 類型： | 時(shí)鐘/頻率合成器，扇出配送，多路復(fù)用器 |
| PLL： | 帶旁路 |
| 輸入： | 晶體 |
| 輸出： | LVDS |
| 電路數(shù)： | 1 |
| 比率 - 輸入:輸出： | 1:6 |
| 差分 - 輸入:輸出： | 無(wú)/是 |
| 頻率 - 最大： | 625MHz |
| 除法器/乘法器： | 是/無(wú) |
| 電源電壓： | 2.375 V ~ 3.465 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-TSSOP（0.173"，4.40mm）裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 24-TSSOP 裸露焊盤 |
| 包裝： | 管件 |
| 其它名稱： | 576-3794 |
SM844256
10 Gigabit Ethernet and SONET, 6 Output,
Ultra-Low Jitter LVDS Frequency
Synthesizer
Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 http://www.micrel.com
July 2010
M9999-072110-B
General Description
The SM844256 provides a low-noise timing solution for
high speed, high accuracy synthesis of clock signals.
Common applications include SONET, Gigabit Ethernet,
10 Gigabit Ethernet, and similar networking standards. It
includes a power reduction methodology, along with a
patented RotaryWave
TM architecture that provides a very
stable clock with very low noise.
Power supplies of either 3.3V or 2.5V are supported, with
superior jitter and phase noise performance. The device
synthesizes different low noise LVDS output frequencies
such as 125MHz, 156.25MHz, 312.5MHz, and 625MHz for
Ethernet applications; 77.76MHz, 155.52MHz, 311.04MHz,
and 622.08MHz for SONET applications. The crystal
reference frequencies used include 25MHz and 19.44Mhz
for Ethernet and SONET applications, respectively.
The SM844256 is an excellent replacement for IDT Femto-
clocks, with improved accuracy, power consumption,
waveform integrity, and jitter.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
Generates six LVDS outputs
2.5V or 3.3V operating range
Typical phase jitter @ 125MHz
(1.875MHz to 20MHz): 80 fs (typical) @ 3.3V
75MHz to 625MHz output frequencies
Industrial temperature range
Green, RoHS, and PFOS compliant
Available in 24-pin TSSOP EPAD
Operating supply modes:
Core/Output
3.3V/3.3V, 3.3V/2.5V, 2.5V/2.5V
Applications
SONET
Gigabit Ethernet
10-Gigabit Ethernet
Infiniband
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Block Diagram
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