L7554

Data Sheet March 1997 L7554 Low-Power SLIC Features s Low active power (typical 165 mW during on-hook transmission) s Sleep state for low idle power (76 mW) s Quiet Tip/Ring polarity reversal s Supports meter pulse injection s Spare op amp for meter pulse filtering s –24 V to –72 V power supply operation s Distortion-free on-hook transmission s Convenient operating states: — Forward powerup — Polarity reversal powerup — Forward low-power scan — Polarity reversal low-power scan — Ground start — Disconnect (high impedance) s Adjustable supervision functions: — Off-hook detector with longitudinal rejection — Ground key detector — Ring trip detector s Independent, adjustable, dc and ac parameters: — dc feed resistance — Loop current limit — Termination impedance s Thermal protection Description This electronic subscriber loop interface circuit (SLIC) is optimized for low-power consumption while providing an extensive set of features. Quiet polarity reversal ...