Microchip SY89840U Bedienungsanleitung


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SY89840U
Precision LVPECL Runt Pulse Eliminator 2:1
Multiplexer
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
Oct. 1, 2013
M9999-021705
hbwhelp@micrel.com or (408) 955-1690
General Description
The SY89840U is a low jitter PECL, 2:1 differential input
multiplexer (MUX) optimized for redundant source
switchover applications. Unlike standard multiplexers,
the SY89840U 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
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
output is 800mV, 100K compatible LVPECL with fast
rise/fall times guaranteed to be less than 190ps.
The SY89840U 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 SY89840U 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.
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 t
pd
< 190ps t
r
/t
f
Unique patent-pending input isolation design minimizes
crosstalk
Fail-safe input prevents oscillations
Ultra-low jitter design:
140fs RMS phase jitter (Typ)
0.7ps
rms
MUX crosstalk induced jitter
Unique patent-pending input termination and VT pin
accepts DC-coupled 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 16-pin (3mm x 3mm) 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.
SY89840U
Oct. 1, 2013
2
M9999-021705
hbwhelp@micrel.com or (408) 955-1690
Typical Application
Simplified Example Illustrating RPE (Runt Pulse Elimination)
Circuit when Primary Clock Fails


Produktspezifikationen

Marke: Microchip
Kategorie: Nicht kategorisiert
Modell: SY89840U

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