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