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SY89845UMGTR Datasheet

  • SY89845UMGTR

  • PRECISION CML RUNT PULSE ELIMINATOR 2:1 MUX WITH 1:2 FANOUT ...

  • 18頁(yè)

  • MICREL   MICREL

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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
鈥渞unt鈥?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).
The differential input includes Micrel鈥檚 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.
The SY89845U operates from a 2.5V 鹵5% or 3.3V
鹵10% supply and is guaranteed over the full
industrial temperature range of 鈥?0擄C to +85擄C. The
SY89845U is part of Micrel鈥檚 high-speed, Precision
Edge
廬
product line.
All support documentation can be found on Micrel鈥檚
web site at:
www.micrel.com.
Precision Edge
廬
Features
鈥?/div>
Selects between two sources, and provides a glitch-
free, stable CML output
鈥?/div>
Guaranteed AC performance over temperature and
supply voltage:
鈥?Wide operating frequency: 1kHz to >1.5GHz
鈥?< 840ps In-to-Out t
pd
鈥?< 80ps t
r
/t
f
鈥?/div>
Unique, patent-pending input isolation design
minimizes crosstalk
鈥?/div>
Fail-Safe Input prevents oscillations
鈥?/div>
Ultra-low jitter design:
鈥?<1ps
RMS
random jitter
鈥?<1ps
RMS
cycle-to-cycle jitter
鈥?<10ps
PP
total jitter (clock)
鈥?<0.7ps
RMS
MUX crosstalk induced jitter
鈥?/div>
Unique patented input termination and VT pin accepts
DC- and AC-coupled inputs (CML, PECL, LVDS)
鈥?/div>
400mV CML output swing
鈥?/div>
2.5V 鹵5% or 3.3V 鹵10% supply voltage
鈥?/div>
-40擄C to +85擄C industrial temperature range
鈥?/div>
Available in 24-pin (4mm x 4mm) MLF鈩?package
Applications
鈥?/div>
Redundant clock switchover
鈥?/div>
Fail-safe clock protection
Markets
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
LAN/WAN
Enterprise servers
ATE
Test and measurement
Precision Edge is a registered trademark of Micrel, Inc.
MLF and
MicroLeadFrame
are trademarks of Amkor Technology, Inc.
Micrel Inc. 鈥?2180 Fortune Drive 鈥?San Jose, CA 95131 鈥?USA 鈥?tel +1 (408) 944-0800 鈥?fax + 1 (408) 474-1000 鈥?http://www.micrel.com
May 2005
M9999-052405
hbwhelp@micrel.com
or (408) 955-1690

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