MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MC33121/D 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 are ...

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