L7557 - Low-Power SLICs

This page provides the datasheet information for the L7557, a member of the L7556 Low-Power SLICs family.

Description

These electronic subscriber loop interface circuits (SLICs) are optimized for low power consumption while providing an extensive set of

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:.

Lucent Technologies

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Datasheet Details

Part number	L7557
Manufacturer	Lucent Technologies
File Size	487.35 KB
Description	Low-Power SLICs
Datasheet	L7557 Datasheet
Additional preview pages of the L7557 datasheet.

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Full PDF Text Transcription

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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 — Loop current limit — Termination impedance s Thermal protection Description These electronic sub

Published: Nov 8, 2017 |