Description

This general-purpose electronic subscriber loop interface circuit (SLIC) is optimized for low cost, while still providing a satisfactory set of features. This part is a pin-for-pin replacement for the Agere L9218/ L9219 SLIC.

Features

■ Basic forward/reverse battery SLIC functionality at a low cost

■ Pin compatible with Agere Systems Inc. L9218/L9219 SLIC

■ Low active power (typical 154 mW during on-hook transmission)

■ Low-power scan mode for low-power, on-hook power dissipation (57 mW typical)

■ Distortion-free, on-hook transmission

■ Convenient operating states:

— Forward powerup

— Reverse powerup

— Low-power scan

— Disconnect (high impedance)

— PPM operational states

■ Minimal external components required

■ Two gain options to optimize the codec interface

■ Adjustable supervision functions:

— Off-hook detector with hysteresis

— Ring trip detector

■ Adjustable loop current limit

■ Adjustable overhead voltage

■ Ramped rate of battery reversal

■ Periodic pulse metering (PPM) compatible

■ Thermal protection with thermal shutdown indication