Introduction
The Agere Systems Inc. L9216 is a subscriber line interface circuit (SLIC) that is optimized for shortloop, power-sensitive applications. This device provides the complete set of line interface functionality, including power ringing needed to interface to a subscriber loop. This device has the capability to operate with a VCC supply of 3.3 V or 5 V and is designed to minimize external components required at all device interfaces.

Features
■ Onboard ringing generation
■ Three ringing input options:
    — Sine wave
    — PWM
    — Logic level square wave
■ Flexible VCC options:
    — 5 V or 3.3 V VCC
    — No –5 V required
■ Battery switch to minimize off-hook power
■ Eight operating states:
    — Scan mode for minimal power dissipation
    — Forward and reverse battery active
    — On-hook transmission states
    — Ground start (tip open)
    — Ring mode
    — Disconnect mode
■ Ultralow on-hook power:
    — 27 mW scan mode
    — 41 mW active mode
■ Two SLIC gain options to minimal external components in codec interface
■ Loop start, ring trip, and ground start detectors
■ Software-controllable dual current-limit option
■ 28-pin PLCC package
■ 48-pin MLCC package

Applications
■ Voice over Internet Protocol (VoIP)
■ Cable Modems
■ Terminal Adapters (TA)
■ Wireless Local Loop (WLL)
■ Telcordia Technologies™ GR-909 Access
■ Network Termination (NT)
■ Key Systems