le79555 Zarlink Semiconductor, le79555 Datasheet - Page 4

• Manufacturer Part Number: le79555
• Description: Subscriber Line Interface Circuit
• Manufacturer: Zarlink Semiconductor

Le79555
Data Sheet
Ring-Trip Detector
During the Ringing state, the DA pin is more positive than the DB pin, and the DET pin will show high to indicate the on hook.
When an off hook condition occurs, the DB pin becomes more positive than the DA pin, and the DET pin will go low to indicate
an off-hook.
Ring Relay Driver
The ring relay driver is active only in the Ringing state.
Relay Driver
A relay driver is activated by logic Low at either input pin, D1, or D2. D1 controls relay driver RYOUT1; D2 controls relay driver
RYOUT2.
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Zarlink Semiconductor Inc.