MC33121 - LOW VOLTAGE SUBSCRIBER LOOP INTERFACE CIRCUIT
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/
MC33121 Features
* k RS 9.1 k RS 9.1 k RC 1.0 k 3 4 16 17 BP ST1 13 CP VDG VAG MC33121 RXI 14 TSI 9 IRXI 10 RRF 4.7 k RRO 20.3 k CRO 1.0 µF 1.0 µF +10.13 dB RRX 30.9 k 5 RSI RECEIVE IN (VRXI) CN RFO 8 BN TXO 11 2.0 k TRANSMIT OUT (VTX) 2 EN CF 7 1
* 24 V VEE VQB 6 301 CCF 1.0 µF 20
