Microchip SY89843U Handleiding
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SY89843U
Precision LVPECL Runt Pulse Eliminator 2:1
MUX with 1:2 Fanout and Internal Termination
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
Oct. 1, 2013
M9999-052207-B
[email protected] or (408) 955-1690
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).
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 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.
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:
–65fs RMS phase jitter (Type)
–0.7ps
RMS
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
Product specificaties
| Merk: | Microchip |
| Categorie: | Niet gecategoriseerd |
| Model: | SY89843U |
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