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SY89847U Datenblatt(PDF) 1 Page - Micrel Semiconductor

Teilenummer SY89847U
Bauteilbeschribung  1.5GHz Precision, LVDS 1:5 Fanout with 2:1 MUX and Fail Safe Input with Internal Termination
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Hersteller  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

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SY89847U
1.5GHz Precision, LVDS 1:5 Fanout with 2:1
MUX and Fail Safe Input with Internal
Termination
Precision Edge is a registered trademark of Micrel, Inc.
MLF and MicroLeadFrame are registered trademarks of Amkor Technology.
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 2007
M9999-031307-A
hbwhelp@micrel.com or (408) 955-1690
General Description
The SY89847U is a 2.5V, 1:5 LVDS fanout buffer
with a 2:1 differential input multiplexer (MUX). A
unique Fail-Safe Input (FSI) protection prevents
metastable output conditions when the selected
input clock fails to a DC voltage (voltage between
the pins of the differential input drops significantly
below 100mV).
The differential input includes Micrel’s unique, 3-pin
internal termination architecture that can 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
outputs are LVDS compatible with very fast rise/fall
times guaranteed to be less than 210ps.
The SY89847U operates from a 2.5V ±5% supply
and
is
guaranteed
over
the
full
industrial
temperature range of –40°C to +85°C. The
SY89847U 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.
Functional Block Diagram
Precision Edge
®
Features
• Selects between two sources, and provides 5
precision LVDS copies
• Fail-Safe Input
– Prevents outputs from oscillating when input is
invalid
• Guaranteed AC performance over temperature and
supply voltage:
– DC-to >1.5GHz throughput
– <1000ps Propagation Delay (IN-to-Q)
– <210ps Rise/Fall times
• Ultra-low jitter design:
– <1psRMS random jitter
– <1psRMS cycle-to-cycle jitter
– <10psPP total jitter (clock)
– <0.7psRMS MUX crosstalk induced jitter
• Unique, patented MUX input isolation design
minimizes adjacent channel crosstalk
• Unique, patented internal termination and VT pin
accepts DC- and AC-coupled inputs (CML, PECL,
LVDS)
• Wide input voltage range VCC to GND
• 2.5V ±5% supply voltage
• -40°C to +85°C industrial temperature range
• Available in 32-pin (5mm x 5mm) MLF® package
Applications
• Fail-safe clock protection
• Ultra-low jitter LVDS clock distribution
• Rack-based Telecom/Datacom
Markets
• LAN/WAN
• Enterprise servers
• ATE
• Test and measurement


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