Microchip SY89465U Bedienungsanleitung
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SY89465U
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SY89465U
Precision LVDS 1:10 Fanout with 2:1 Runt
Pulse Eliminator MUX and Internal Termination
Micrel Inc. • 218
0 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • ht
tp://www.micrel.com
August 2010
M9999-080510-C
hbwhelp@micrel.com
or (408) 955-1690
General Description
The SY8946
5U is a low-jitter, 1:10 LVDS fanout
buffer with a 2:1 differential input multiplexer (MUX)
optimized for redundant source switchover
applications. Unlike standard multiplexers, the
SY89465Us 2:1 Runt Pulse Eliminator (RPE) MUX
prevents any short cycles or “runt” pulses during
switchover. In addition, a unique Fail-Safe Input
(FSI) 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, 3-pin internal
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 LVDS-compatible with
fast rise/fall times guaranteed to be less than 220ps.
The SY89465U operates from a 2.5V ±5% supply
and is guaranteed over the full industrial
temperature range of –40°C to +85°C. The
SY89465U 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 10
precision LVDS copies
• Guaranteed AC performance over temperature and
supply voltage:
– Wide operating frequency: 1kHz to >1.5GHz
– <1200ps In-to-Out t
pd
– <2
20ps t
r
/t
f
• Uniq
ue, patent-pending input isolation design
minimizes adjacent channel crosstalk
• Fail-Safe Input prevents oscillations
• Ultra-low jitter design:
–
183 fs
RMS
phase jitter (typical)
– <0.7ps
RMS
MUX crosstalk-induced jitter
• Unique patented input termination and VT pin accepts
DC-
and AC-cou
pled inputs (CML, PECL, LVDS)
• 325mV LVDS output swing
• 2.5V ±5% supply voltage
• −40
°C to +85°C industrial temperatur
e range
• Output enable
• Available in 44-pin (7mm x 7mm) QFN package
Applications
• Redundant clock switchover
• Fail-safe clock protection
Markets
• LAN/WAN
• Enterprise servers
• ATE
• Test and measurement
Precision Edge is a registered trademark of Micrel, Inc.
Micrel, Inc. SY89465U
August 2010 M9999-080510-C
hbwhelp@micrel.com or (408) 955-1690
2
Typical Application
Simplified Example Illustrating Runt Pulse Eliminator (RPE) when Primary Clock Fails
Ordering Information
Part Number Package Type Operating Range Package Marking Lead Finish
SY89465UMY QFN-44 Industrial
SY89465U with
Pb-Free bar-line Indicator
Matte-Sn
Pb-Free
SY89465UMYTR
(2)
QFN-44 Industrial
SY89465U with
Pb-Free bar-line Indicator
Matte-Sn
Pb-Free
Notes:
1. Contact factory for die availability. Dice are guaranteed at T
A
= 25°C, DC Electricals only.
2. Tape and Reel.
Produktspezifikationen
| Marke: | Microchip |
| Kategorie: | Nicht kategorisiert |
| Modell: | SY89465U |
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