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SY89846U_11 Datasheet, PDF (1/15 Pages) Micrel Semiconductor – 1.5GHz Precision, LVPECL 1:5 Fanout with 2:1 | |||
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SY89846U
1.5GHz Precision, LVPECL 1:5 Fanout with 2:1
MUX and Fail Safe Input with Internal
Termination
Precision Edge®
General Description
The SY89846U is a 2.5/3.3V, 1:5 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 (voltage between
the pins of the differential input drops significantly
below 100mV).
The differential input includes Micrelâs 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 250ps.
The SY89846U operates from a 2.5V ±5% or 3.3V
±10% supply and is guaranteed over the full
industrial temperature range of â40°C to +85°C. The
SY89846U is part of Micrelâs high-speed, Precision
Edge® product line.
All support documentation can be found on Micrelâs
web site at: www.micrel.com.
Functional Block Diagram
Features
Precision Edge®
⢠Selects between two inputs, and provides 5 precision
LVPECL copies
⢠Fail-Safe Input
â Prevents outputs from oscillating when input is
invalid
⢠Guaranteed AC performance over temperature and
supply voltage:
â DC-to >1.5GHz throughput
â < 900ps Propagation Delay (IN-to-Q)
â < 250ps Rise/Fall times
⢠Ultra-low jitter design:
â <1psRMS random jitter
â <1psRMS cycle-to-cycle jitter
â <10psPP total jitter (clock)
â <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 3.3 ±10% supply voltage
⢠-40°C to +85°C industrial temperature range
⢠Available in 32-pin (5mm x 5mm) MLF® package
Applications
⢠Fail-safe clock protection
⢠SONET clock distribution
⢠Backplane distribution
Markets
⢠LAN/WAN
⢠Enterprise servers
⢠ATE
⢠Test and measurement
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
July 2011
M9999-071811B
hbwhelp@micrel.com or (408) 955-1690
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