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Micrel Semiconductor

SY89467U Datasheet Preview

SY89467U Datasheet

Precision LVPECL 1:20 Fanout

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SY89467U
Precision LVPECL 1:20 Fanout with 2:1 MUX
and Internal Termination with Fail-Safe Input
General Description
The SY89467U is a 2.5/3.3V, 1:20 LVPECL 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 (when 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 800mV, LVPECL with fast rise/fall times
guaranteed to be less than 270ps.
The SY89467U 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
SY89467U 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 inputs, and provides 20
precision LVPECL copies
Fail-Safe Input
– Prevents outputs from oscillating when input is
invalid
Guaranteed AC performance over temperature and
supply voltage:
– DC-to >1.5 GHz throughput
– < 1200ps Propagation Delay (In-to-Q)
– 270ps 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% or 3.3V ±10% supply voltage
-40°C to +85°C industrial temperature range
Available in 64-pin TQFP package
Applications
Fail-safe clock protection
SONET clock distribution
Backplane distribution
Markets
LAN/WAN
Enterprise servers
ATE
Test and measurement
United States Patent No. RE44,134
Precision Edge is a registered trademark of Micrel, Inc.
MicroLeadFrame and MLF are registered trademarks of Amkor Technology, 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
April 2008
M9999-040808-C
hbwhelp@micrel.com or (408) 955-1690




Micrel Semiconductor

SY89467U Datasheet Preview

SY89467U Datasheet

Precision LVPECL 1:20 Fanout

No Preview Available !

Micrel, Inc.
Ordering Information(1)
Part Number
Package
Type
Operating
Range
Package Marking
SY89467UHY
T64-1
Industrial
SY89467UHY with
Pb-Free bar-line Indicator
SY89467UHYTR(2)
T64-1
Industrial
SY89467UHY with
Pb-Free bar-line Indicator
Notes:
1. Contact factory for die availability. Dice are guaranteed at TA = 25°C, DC Electricals Only.
2. Tape and Reel.
SY89467U
Lead
Finish
Matte-Sn
Pb-Free
Matte-Sn
Pb-Free
Pin Configuration
64-Pin EPAD-TQFP (T64-1)
April 2008
2 M9999-040808-C
hbwhelp@micrel.com or (408) 955-1690


Part Number SY89467U
Description Precision LVPECL 1:20 Fanout
Maker Micrel Semiconductor
Total Page 15 Pages
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