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L7557

Part Number	L7557
Manufacturer	Lucent Technologies
Description	Low-Power SLICs
Published	Nov 8, 2017
Detailed Description	Data Sheet January 2000 L7556, L7557 Low-Power SLICs with Battery Switch Features s Auxiliary input for second battery...
Datasheet	L7557 PDF File

Overview

Data Sheet January 2000 L7556, L7557 Low-Power SLICs with Battery Switch Features s Auxiliary input for second battery, and internal switch to enable its use to save power s Low active power (typical 125 mW during on-hook transmission) s Supports meter pulse injection s Spare op amp for meter pulse filtering s –16 V to –60 V power supply operation s Distortion-free on-hook transmission s Convenient operating states: — Forward powerup — Disconnect (high impedance) — 2-wire wink (zero loop voltage) 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...

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