Datasheet > SM844256

SM844256

更新时间： 2024-02-24 00:23:24

品牌	Logo	应用领域
麦瑞 - MICREL		以太网
页数	文件大小	规格书
8页	241K
描述
10 Gigabit Ethernet and SONET, 6 Output, Ultra-Low Jitter LVDS Frequency Synthesizer

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中文翻译

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技术参数
数据手册

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SM844256 技术参数

是否Rohs认证：	符合	生命周期：	Active
包装说明：	GREEN AND PFOS FREE, TSSOP-24	Reach Compliance Code：	compliant
HTS代码：	8542.39.00.01	风险等级：	5.77
JESD-30 代码：	R-PDSO-G24	JESD-609代码：	e3
长度：	7.8 mm	湿度敏感等级：	3
功能数量：	1	端子数量：	24
最高工作温度：	85 °C	最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	HTSSOP
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）：	260	座面最大高度：	1.2 mm
标称供电电压：	2.5 V	表面贴装：	YES
温度等级：	INDUSTRIAL	端子面层：	MATTE TIN
端子形式：	GULL WING	端子节距：	0.65 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	40
宽度：	4.4 mm	Base Number Matches：	1

SM844256 数据手册

SM844256

10 Gigabit Ethernet and SONET, 6 Output,

Ultra-Low Jitter LVDS Frequency

Synthesizer

General Description

Features

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^TMarchitecture that provides a very

stable clock with very low noise.

• 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:

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.

Core/Output

3.3V/3.3V, 3.3V/2.5V, 2.5V/2.5V

Applications

The SM844256 is an excellent replacement for IDT Femto-

clocks, with improved accuracy, power consumption,

waveform integrity, and jitter.

• SONET

• Gigabit Ethernet

• 10-Gigabit Ethernet

• Infiniband

Data sheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

________________________________________________________________________________________________________________________

Block Diagram

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

M9999-072110-B

July 2010

12 3 4 5 6 7 8

中文翻译

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与SM844256相关器件

型号	品牌	获取价格	描述	数据表
SM844256KA	MICREL	获取价格	10 Gigabit Ethernet and SONET, 6 Output, Ultra-Low Jitter LVDS Frequency Synthesizer
SM844256KATR	MICREL	获取价格	DATACOM, PDSO24, GREEN AND PFOS FREE, TSSOP-24
SM844256KA-TR	MICROCHIP	获取价格	DATACOM, PDSO24
SM-845.3KOHMS1%	VISHAY	获取价格	Fixed Resistor, Wire Wound, 0.125W, 45300ohm, 150V, 1% +/-Tol, -10,10ppm/Cel, 2714
SM-845.3OHMS0.005%	VISHAY	获取价格	Fixed Resistor, Wire Wound, 0.125W, 45.3ohm, 150V, 0.005% +/-Tol, -20,20ppm/Cel, 2714
SM-845.3OHMS0.02%	VISHAY	获取价格	Fixed Resistor, Wire Wound, 0.125W, 45.3ohm, 150V, 0.02% +/-Tol, -20,20ppm/Cel, 2714
SM-845.3OHMS0.1%	VISHAY	获取价格	Fixed Resistor, Wire Wound, 0.125W, 45.3ohm, 150V, 0.1% +/-Tol, -20,20ppm/Cel, 2714
SM-845.3OHMS0.25%	VISHAY	获取价格	Fixed Resistor, Wire Wound, 0.125W, 45.3ohm, 150V, 0.25% +/-Tol, -20,20ppm/Cel, 2714
SM-845.3OHMS0.5%	VISHAY	获取价格	暂无描述
SM-845.3OHMS1%	VISHAY	获取价格	Fixed Resistor, Wire Wound, 0.125W, 45.3ohm, 150V, 1% +/-Tol, -20,20ppm/Cel, 2714

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