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SY89843U_10

更新时间: 2024-11-26 07:20:11
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麦瑞 - MICREL 脉冲
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17页 653K
描述
Precision LVPECL Runt Pulse Eliminator 2:1

SY89843U_10 数据手册

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SY89843U  
Precision LVPECL Runt Pulse Eliminator 2:1  
MUX with 1:2 Fanout and Internal Termination  
General Description  
The SY89843U is a low jitter PECL, 2:1 differential input  
multiplexer (MUX) optimized for redundant source  
switchover applications. Unlike standard multiplexers,  
the SY89843U 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 LVPECL output  
Guaranteed AC performance over temperature  
and supply voltage:  
– Wide operating frequency: 1kHz to >1.5GHz  
– < 880ps In-to-Out tpd  
– < 190ps tr/tf  
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 (200mVPP) without any level shifting  
or termination resistor networks in the signal path. The  
output is 800mV, 100K compatible LVPECL with fast  
rise/fall times guaranteed to be less than 190ps.  
Unique patent-pending input isolation design  
minimizes crosstalk  
Fail-Safe Input prevents oscillations  
Ultra-low jitter design:  
– <1psRMS random jitter  
– <1psRMS cycle-to-cycle jitter  
– <10psPP total jitter (clock)  
The SY89843U 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 SY89843U is  
part of Micrel’s high-speed, Precision Edge® product  
line. All support documentation can be found on Micrel’s  
web site at: www.micrel.com.  
– <0.7psRMS MUX crosstalk induced jitter  
Unique patent-pending input termination and VT  
pin accepts DC- and AC-coupled inputs (CML,  
PECL, LVDS)  
800mV LVPECL 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  
Failsafe 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  
M9999-052207-B  
hbwhelp@micrel.com or (408) 955-1690  
May 2007  

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