Datasheet > SY89845U

SY89845U

更新时间： 2024-09-29 14:55:31

品牌	Logo	应用领域
美国微芯 - MICROCHIP		/
页数	文件大小	规格书
18页	623K
描述
The SY89845U is a low jitter CML, 2:1 differential input multiplexer (MUX) optimized for redundant

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SY89845U 数据手册

SY89845U

Precision CML Runt Pulse Eliminator 2:1 MUX

with 1:2 Fanout and Internal Termination

General Description

The SY89845U is a low jitter CML, 2:1 differential

input multiplexer (MUX) optimized for redundant

source switchover applications. Unlike standard

multiplexers, the SY89845U unique 2:1 Runt Pulse

Eliminator (RPE) MUX prevents any short cycles or

“runt” pulses during switchover. In addition, a unique

Fail-Safe Input protection prevents metastable

conditions when the selected input clock fails to a

DC voltage (voltage between the pins of the

differential input drops below 100mV).

Precision Edge^®

Features

• Selects between two sources, and provides a glitch-

free, stable CML output

• Guaranteed AC performance over temperature and

supply voltage:

– Wide operating frequency: 1kHz to >1.5GHz

The differential input includes Micrel’s unique, 3-pin

input termination architecture that allows customers

to interface to any differential signal (AC- or DC-

coupled) as small as 100mV (200mV_PP) without any

level shifting or termination resistor networks in the

signal path. The outputs are 400mV CML with fast

rise/fall times guaranteed to be less than 80ps.

– < 840ps In-to-Out t_pd

– < 80ps t_r/t_f

• Unique, patent-pending input isolation design

minimizes crosstalk

• Fail-Safe Input prevents oscillations

• Ultra-low jitter design:

– <1ps_RMSrandom jitter

The SY89845U operates from a 2.5V ±5% or 3.3V

±10% supply and is guaranteed over the full

industrial temperature range of –40°C to +85°C. The

SY89845U is part of Micrel’s high-speed, Precision

Edge^®product line.

– <1ps_RMScycle-to-cycle jitter

– <10ps_PPtotal jitter (clock)

– <0.7ps_RMSMUX crosstalk induced jitter

• Unique patented input termination and VT pin accepts

DC- and AC-coupled inputs (CML, PECL, LVDS)

All support documentation can be found on Micrel’s

web site at: www.micrel.com.

• 400mV CML output swing

• 2.5V ±5% or 3.3V ±10% supply voltage

• -40°C to +85°C industrial temperature range

• Available in 24-pin (4mm x 4mm) QFN package

Applications

• Redundant clock switchover

• Fail-safe clock protection

Markets

• LAN/WAN

• Enterprise servers

• ATE

• Test and measurement

Precision Edge is a registered trademark of Micrel, Inc.

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

M9999-052405

hbwhelp@micrel.com or (408) 955-1690

May 2005

12 3 4 5 6 7...18

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与SY89845U相关器件

型号	品牌	获取价格	描述	数据表
SY89845U_10	MICREL	获取价格	Precision CML Runt Pulse Eliminator 2:1 MUX
SY89845UMG	MICREL	获取价格	PRECISION CML RUNT PULSE ELIMINATOR 2:1 MUX WITH 1:2 FANOUT AND INTERNAL TERMINATION
SY89845UMGTR	MICREL	获取价格	PRECISION CML RUNT PULSE ELIMINATOR 2:1 MUX WITH 1:2 FANOUT AND INTERNAL TERMINATION
SY89845UMG-TR	MICREL	获取价格	Multiplexer, 89845 Series, 1-Func, 2 Line Input, 1 Line Output, Complementary Output, 4 X
SY89846U	MICREL	获取价格	1.5GHz Precision, LVPECL 1:5 Fanout with 2:1 MUX and Fail Safe Input with Internal Termina
SY89846U	MICROCHIP	获取价格	The SY89846U is a 2.5/3.3V, 1:5 LVPECL fanout buffer with a 2:1 differential input multipl
SY89846U_11	MICREL	获取价格	1.5GHz Precision, LVPECL 1:5 Fanout with 2:1
SY89846UMG	MICREL	获取价格	1.5GHz Precision, LVPECL 1:5 Fanout with 2:1 MUX and Fail Safe Input with Internal Termina
SY89846UMGTR	MICREL	获取价格	1.5GHz Precision, LVPECL 1:5 Fanout with 2:1 MUX and Fail Safe Input with Internal Termina
SY89847U	MICREL	获取价格	1.5GHz Precision, LVDS 1:5 Fanout with 2:1 MUX and Fail Safe Input with Internal Terminati

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