Microchip SY89827L Bedienungsanleitung


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Precision Edge
®
SY89827LMicrel, Inc.
M9999-073010
[email protected] or (408) 955-1690
DESCRIPTION
Dual LVPECL or HSTL input, 10 differential 1.5V
HSTL compatible outputs
Congurableasdual-channel10outputorasingle-
channel20outputclockdriver
GuaranteedACparametersovertemperatureand
voltage:
>500MHzf
MAX
<50pswithindeviceskew
<1.5nspropagationdelay
<700pst
r
/ t
f
time
Lowjitterdesign
186fs
RMS
phasejitter
3.3Vcoresupply,1.8Voutputsupply
Output enable function
Availableina64-PinEPAD-TQFP
FEATURES
3.3V500MHzDUAL1:10HSTLFANOUT
BUFFER/TRANSLATORWITH2:1MUXINPUT
Precision Edge
®
SY89827L
APPLICATIONS
High-performancePCs
Workstations
Parallelprocessor-basedsystems
Otherhigh-performancecomputing
Communications
Rev.: F Amendment: /0
Issue Date: July 2010
The SY89827L is a High Performance Bus Clock
Driver with dual 1:10 or single 1:20 HSTL (High Speed
Transceiver Logic) output pairs. The part is designed for
use in low voltage (3.3V/1.8V) applications which require a
large number of outputs to drive precisely aligned, ultra low
skew signals to their destination. The input is multiplexed
from either HSTL or LVPECL (Low Voltage Positive Emitter
Coupled Logic) by the CLK_SEL pin. The Output Enables
(OE1 & OE2) are synchronous so that the outputs will only
be enabled/disabled when they are already in the LOW state.
This avoids any chance of generating a runt clock pulse
when the device is enabled/disabled as can happen with an
asynchronous control.
The SY89827L features extremely low skew performance
of <50ps over temperature and voltage –performance
previously unachievable in a standard product having such
a high number of outputs. The SY89827L is available in a
single space saving package, enabling a lower overall cost
solution. For applications that require greater HSTL fanout
capability, consider the SY89824L.
TYPICALAPPLICATIONCIRCUIT
SEL1
Primary/Backup Clock Select
(Switchover within 2.0ns)
LVPECL_CLKA
/LVPECL_CLKA
LVPECL_CLKB
/LVPECL_CLKB
PrimaryClockSource
RedundantBackup
ClockSource
10
10
10
10
Primary
Card
Redundant
Card
System using SY89827L as a switchover circuit from a Primary Clock to a Redundant Backup Clock in a failsafe application.
LVPECL inputs only, shown in this application.
Precision Edge is a registered trademark of Micrel, Inc.
Precision Edge
®
NOT RECOMMENDED FOR NEW DESIGNS


Produktspezifikationen

Marke: Microchip
Kategorie: Nicht kategorisiert
Modell: SY89827L

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