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Micrel Semiconductor
Micrel Semiconductor

SY89843U Datasheet Preview

SY89843U Datasheet

Precision LVPECL Runt Pulse Eliminator 2:1 MUX

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SY89843U pdf
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,
Features
Precision Edge ®
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).
The differential input includes Micrel’s unique, 3-pin
input termination architecture that allows customers to
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
Unique patent-pending input isolation design minimizes
crosstalk
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.
The SY89843U operates from a 2.5V ±5% or 3.3V
Fail-Safe Input prevents oscillations
Ultra-low jitter design:
– <1psRMS random jitter
– <1psRMS cycle-to-cycle jitter
– <10psPP total jitter (clock)
– <0.7psRMS MUX crosstalk induced jitter
±10% supply and is guaranteed over the full induswtwrwia.DlataSheet4U.comUnique patent-pending input termination and VT pin
temperature range of –40°C to +85°C. The SY89843U is
part of Micrel’s high-speed, Precision Edge® product
accepts DC- and AC-coupled inputs (CML, PECL, LVDS)
800mV LVPECL output swing
line. All support documentation can be found on Micrel’s 2.5V ±5% or 3.3V ±10% supply voltage
web site at: www.micrel.com.
–40°C to +85°C industrial temperature range
Available in 24-pin (4mm x 4mm) MLFpackage
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.
MLF and MicroLeadFrame are trademarks of Amkor Technology, 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
March 2005
M9999-031505
hbwhelp@micrel.com or (408) 955-1690



Micrel Semiconductor
Micrel Semiconductor

SY89843U Datasheet Preview

SY89843U Datasheet

Precision LVPECL Runt Pulse Eliminator 2:1 MUX

No Preview Available !

SY89843U pdf
Micrel, Inc.
Typical Application
SY89843U
Simplified Example Illustrating RPE (Runt Pulse Elimination)
Circuit when Primary Clock Fails
March 2005
2 M9999-031505
hbwhelp@micrel.com or (408) 955-1690


Part Number SY89843U
Description Precision LVPECL Runt Pulse Eliminator 2:1 MUX
Maker Micrel Semiconductor
Total Page 17 Pages
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Micrel Semiconductor
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