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Data Sheet

March 1997

L7554 Low-Power SLIC

Features

s

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 鏗乴tering.

The device is being offered in two versions, based

upon maximum battery. The L7554AP is guaranteed

to 鈥?0 V, and the L7554BP is guaranteed to 鈥?2 V.

The device is available in a 44-pin PLCC package. It

is built by using a 90 V complementary bipolar

(CBIC) process.

Low active power (typical 165 mW during on-hook

transmission)

Sleep state for low idle power (76 mW)

Quiet Tip/Ring polarity reversal

Supports meter pulse injection

Spare op amp for meter pulse 鏗乴tering

鈥?4 V to 鈥?2 V power supply operation

Distortion-free on-hook transmission

Convenient operating states:

鈥?Forward powerup

鈥?Polarity reversal powerup

鈥?Forward low-power scan

鈥?Polarity reversal low-power scan

鈥?Ground start

鈥?Disconnect (high impedance)

Adjustable supervision functions:

鈥?Off-hook detector with longitudinal rejection

鈥?Ground key detector

鈥?Ring trip detector

Independent, adjustable, dc and ac parameters:

鈥?dc feed resistance

鈥?Loop current limit

鈥?Termination impedance

Thermal protection

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L7554相關(guān)型號PDF文件下載

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• L7551-32
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  HAMAMATSU ...
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• L7551-44
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  HAMAMATSU
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• L7551-44
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  HAMAMATSU ...
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• L7558-01
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  High-speed, high-power infrared LED for spatial light transm...
  HAMAMATSU
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• L7558-01
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  HAMAMATSU ...
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