SY89464UMYTR datasheet(11/19 Pages) MICREL

Part #	SY89464UMYTR

Description	Precision LVPECL 1:10 Fanout with 2:1 Runt

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Manufacturer	MICREL [Micrel Semiconductor]

Direct Link	http://www.micrel.com

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11 / 19 page

Micrel, Inc.

SY89464U

December 2007

M9999-120607-B

hbwhelp@micrel.com or (408) 955-1690

11

Case #4: Input Clock Failure: Switching from the

selected clock input stuck in an undetermined state to

a valid clock input (RPE-enabled).

If CLK1 fails to an undetermined state (e.g., amplitude

falls below the 100mV (VIN) minimum single-ended

input limit, or 200mV differentially) before the RPE

MUX selects CLK2 (using the SEL pin), the switchover

to the valid clock CLK2 will occur either following Case

#2 or Case #3, depending upon the last valid state at

the CLK1.

If the selected input clock fails to a floating, static, or

extremely low signal swing, including 0mV, the FSI

function will eliminate any metastable condition and

guarantee a stable output signal. No ringing and no

undetermined state will occur at the output under

these conditions.

Please note that the FSI function will not prevent duty

cycle distortions or runt pulses in case of a slowly

deteriorating (but still toggling) input signal. Due to the

FSI function, the propagation delay will depend upon

rise and fall time of the input signal and on its

amplitude. Refer to “Typical Operating Characteristics”

for detailed information.

Timing Diagram 4

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