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ATTL7554AP Datasheet(PDF) 1 Page - Agere Systems |
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ATTL7554AP Datasheet(HTML) 1 Page - Agere Systems |
1 / 28 page 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 is possible because the ac path is uninterrupted during transition. The L7554 includes the ground start state and a summing node for meter pulse injection to 2.2 Vrms. A spare, uncommitted op amp is included for meter pulse filtering. The device is being offered in two versions, based upon maximum battery. The L7554AP is guaranteed to –60 V, and the L7554BP is guaranteed to –72 V. The device is available in a 44-pin PLCC package. It is built by using a 90 V complementary bipolar (CBIC) process. |
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