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SY89837U Fiches technique(PDF) 5 Page - Micrel Semiconductor

No de pièce SY89837U
Description  PRECISION 1:8 LVPECL FANOUT BUFFER WITH 2:1 RUNT PULSE ELIMINATOR INPUT MUX
Download  14 Pages
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Fabricant  MICREL [Micrel Semiconductor]
Site Internet  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

SY89837U Fiches technique(HTML) 5 Page - Micrel Semiconductor

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Precision Edge®
SY89837U
Micrel, Inc.
M9999-022007
hbwhelp@micrel.com or (408) 955-1690
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:
• Stage 1: The output will remain HIGH for a
limited number of pulses of CLK2.
• Stage 2: The output will switch to LOW and then
remain LOW for a limited number of falling edges
of CLK2.
• Stage 3: The output will follow CLK2.
Case #3 Input Clock Failure: Switching from a selected clock
stuck LOW to a valid clock (RPE enabled).
If CLK1 fails LOW before the RPE MUX selects CLK2
(using the SEL pin), the switchover will occur in two stages.
• Stage 1: The output will remain LOW for a
limited number of falling edges of CLK2.
• Stage 2: The output will follow CLK2.
CLK1
CLK2
SEL
OUTPUT
Select CLK1
Stage 1
Stage 2
Stage 3
Select CLK2
14 to 16 falling edges of CLK2
Runt pulse eliminated
from output
Figure 3. Timing Diagram 2(1)
CLK1
CLK2
SEL
OUTPUT
Select CLK1
Stage 1
Stage 2
Select CLK2
13 to 17 falling edges of CLK2
Figure 4. Timing Diagram 3
Note:
1. 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.


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