参数资料
| 型号： | SM844256KA |
| 厂商： | Micrel Inc |
| 文件页数： | 1/8页 |
| 文件大小： | 0K |
| 描述： | IC SYNTHESIZER LVDS 24-TSSOP |
| 产品培训模块： | High Bandwidth Product Overview |
| 标准包装： | 62 |
| 系列： | RotaryWave™ |
| 类型： | 时钟/频率合成器，扇出配送，多路复用器 |
| PLL： | 带旁路 |
| 输入： | 晶体 |
| 输出： | LVDS |
| 电路数： | 1 |
| 比率 - 输入:输出： | 1:6 |
| 差分 - 输入:输出： | 无/是 |
| 频率 - 最大： | 625MHz |
| 除法器/乘法器： | 是/无 |
| 电源电压： | 2.375 V ~ 3.465 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 24-TSSOP 裸露焊盘 |
| 包装： | 管件 |
| 其它名称： | 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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