Part Number
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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
|
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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