L7554 Datasheet | Lucent Technologies

Features s Low active power (typical 165 m W during on-hook transmission) s Sleep state for low idle power (76 m W) 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...