sy89464u Micrel Semiconductor, sy89464u Datasheet - Page 9

• Manufacturer Part Number: sy89464u
• Description: Sy89464u Precision Lvpecl Runt Pulse Eliminator 2 1 Mux With 1 10 Fanout And Internal Termination
• Manufacturer: Micrel Semiconductor

Case #2: Input Clock Failure: Switching from a
selected clock stuck HIGH to a valid clock (RPE-
enabled).
If CLK1 fails HIGH before the RPE MUX selects
CLK2 (using the SEL pin), the switchover will occur
in three stages.
Note: Output shows extended clock cycle during switchover. Pulse width for both high and low of this cycle will always be
greater than 50% of the CLK2 period.
December 2007
Timing Diagram 2
9
• Stage 1: The output will remain HIGH for a
• Stage 2: The output will switch to LOW and then
• Stage 3: The output will follow CLK2.
limited number of pulses of CLK2.
remain LOW for a limited number of falling edges
of CLK2.
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