Introduction
The Agere Systems Inc. L9311 is a combination full feature, ultralow-power SLIC, solid-state ringing access relay, and line test matrix. It is part of a pin for-pin compatible family of devices designed to serve a wide variety of applications. The L9311 is optimized for North American access applications where TR-57 longitudinal balance and GR-909 line test are required.

Description
The L9311 electronic line interface and line access circuit (LILAC) provides all the functions that are necessary to interface a codec to the tip and ring of a subscriber loop, integrating the battery feed and ringing access relay and line test access in one low power, low-cost package.
The L9311 requires a 5 V and battery supply to operate. Included is an automatic battery switch. The battery feed offers forward and reverse battery, on-hook transmission, and ground start operational modes. It also has a low-power scan and a disconnect mode.
In all operating states, this IC is designed for minimal power dissipation. This device is designed to minimize the number of external components required at all interfaces.

FEATUREs
SLIC
■ 5 V and battery operation
■ Optional automatic battery switch
■ 13 operational and test modes
■ Appropriate for 58 dB longitudinal balance applications
■ Minimal external components required at all interfaces
■ Ultralow power dissipation
■ Software/hardware adjustable dc parameters and supervision thresholds
■ Ground start

Solid-State Ring Relay
■ Low impulse noise
■ Current-limited switches/thermal protection

Line Test Matrix
■ GR-909 test capability
■ Single-ended or differential measurements
■ Current or voltage sense
■ ac or dc measurements
■ Dedicated analog input and output

APPLICATIONs
■ Pair Gain
■ Digital Loop Carrier (DLC)
■ Central Office (CO)
■ Fiber-in-the-Loop (FITL)