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L3000N Datasheet(PDF) 9 Page - STMicroelectronics

No. de pieza L3000N
Descripción Electrónicos  SLIC KIT OPTIMIZED FOR APPLICATIONS WITH BOTH FIRST AND SECOND GENERATION COMBOS
PDF  32 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L3000N Datasheet(HTML) 9 Page - STMicroelectronics

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RING wires the voltage will increases to – 24V.
The comparator C1 will change its output voltage
from low to high level.
If the Chip Select input (CS) is low the ONHK out-
put pin will be set to low level (+ 0V) indicating
that the off hook condition is present.
This off-hook detection circuit can be influenced
by common mode signal present on RING Termi-
nal. The capacitor Cs is used to filter this common
mode signal.
In the case of very high common mode signal af-
ter the detection of a low level on the ONHK out-
put pin, it is suggested to set the SLIC in Stand-
by. In this operating mode the off-hook detection
circuit is not sensitive to the line common mode
signal.
If in Stand-by Mode the off-hook detection is not
confirmed (ONHK output set to high level) we
suggest after few second to set the SLIC again in
Power Down Mode.
Total operation is managed by line card control-
ler.
Figure 4: Off-hook Detection Circuit in Power Down Mode
L3000N
L3000N - L3092
9/32



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