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SY58610U Datasheet(PDF) 6 Page - Micrel Semiconductor

Part No. SY58610U
Description  3.2Gbps Precision, LVPECL 2:1 MUX with Internal Termination and Fail Safe Input
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

SY58610U Datasheet(HTML) 6 Page - Micrel Semiconductor

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Micrel, Inc.
SY58610U
November 2006
6
M9999-111406-A
hbwhelp@micrel.com or (408) 955-1690
Functional Description
Fail-Safe Input (FSI)
The input includes a special fail-safe circuit to sense
the amplitude of the input signal and to latch the
outputs when there is no input signal present, or
when the amplitude of the input signal drops
sufficiently below 100mVPK (200mVPP), typically
30mVPK. Maximum frequency of the SY58610U is
limited by the FSI function.
Input Clock Failure Case
If the input clock fails to a floating, static, or extremely
low signal swing, such that the voltage swing across
the input pair is less than 100mV, the FSI function will
eliminate a metastable condition and latch the outputs
to the last valid state. No ringing and no undetermined
state will occur at the output under these conditions.
The output recovers to normal operation once the
input signal returns to a valid state with a swing
greater than 100mV.
Note that the FSI function will not prevent duty cycle
distortion in case of a slowly deteriorating (but still
toggling) input signal. Due to the FSI function, the
propagation delay will depend on rise and fall time of
the input signal and on its amplitude. Refer to “Typical
Operating Characteristics” for detailed information.
Timing Diagrams
Figure 1a. Fail Safe Feature
Figure 1b. Propagation Delay IN-to-Q


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