Description
The Agere Systems Inc. L8576B electronic dual subscriber line interface circuit (SLIC) provides all the functions that are necessary to interface a codec to the tip and ring of a subscriber loop, integrating two battery feeds and ringing generators in one low-cost package. The L8576B device is optimized to meet the needs of short loop, customer premises applications and features balanced ringing from the single battery supply. The device is built using a 90 V complementary bipolar (CBIC) process. It is available in a 44-pin PLCC package.

Features
■ Two SLIC channels for multiple tip/ring interfaces
■ On-chip balanced ringing generator, no ring relay required
■ Single battery operation or optional automatic battery switch
■ Quiet battery reversal for on-hook signaling
■ Disconnect state
■ Distortion-free, on-hook transmission
■ 24 mA loop current limiter
■ Ring trip detector
■ Switchhook detector
■ Immune to channel crosstalk and impulse noise
■ Allows rail overvoltages for ease of protection
■ Thermal protection
■ 44-pin, surface-mount, plastic package (PLCC)

Applications
■ POTS for ISDN
■ Terminal adapters (TA)
■ Digital loop carrier (DLC) systems
■ PABX