Datasheet Summary
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
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MC33121 Low Voltage Subscriber Loop Interface Circuit (SLIC) Thin Film Silicon Monolithic Integrated Circuit
The MC33121 is designed to provide the interface between the 4- wire side of a central office, or PBX, and the 2- wire subscriber line. Interface functions include battery feed, proper loop termination AC impedance, hookswitch detection, adjustable transmit, receive, and transhybrid gains, and single/ double fault indication. Additionally, the MC33121 provides a minimum of 58 dB of longitudinal balance (4- wire and 2- wire). The transmit and receive signals are referenced to analog ground, while digital signals...