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MC33121 Datasheet(PDF) 1 Page - Motorola, Inc |
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MC33121 Datasheet(HTML) 1 Page - Motorola, Inc |
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1 / 32 page  MC33121 MOTOROLA 1 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 referenced to digital ground, easing the interface to codecs, filters, etc. The 2 status outputs (hookswitch and faults) and the Power Down Input are TTL/CMOS compatible. The Power Down Input permits local shutdown of the circuit. Internal drivers allow the external loop current pass transistors to be standard bipolar transistors (non–Darlington). The MC33121 is available in a 20 pin DIP and a 28 pin PLCC surface mount package. • 58 dB Longitudinal Balance Guaranteed; 4–wire and 2–wire • Transmit, Receive, and Transhybrid Gains Externally Adjustable • Return Loss Externally Adjustable • Proper Hookswitch Detection With 30 kΩ Leakage • Single/Double Fault Indication With Shutdown for Thermal Protection • Critical Sense Resistors Included Internally • Standard Power Supplies: – 21.6 V to – 42 V, and + 5.0 V, ± 10% • On–Hook Transmission • Power Down Input (TTL and CMOS Compatible) • Operating Ambient Temperature: – 40°C to + 85°C • Available in a 20 Pin DIP and 28 Pin PLCC Package SIMPLIFIED BLOCK DIAGRAM – + + – + – – + VCC EP BP CP TSI RSI CN BN EN VEE (BATTERY) TIP RING VEE VCC * * * * CURRENT MIRROR HOOK STATUS AND FAULT DETECTION AND BIAS CONTROL BIAS MC33121 VDD (+5.0 V) VDG (DIG. GND) PDI/ST2 ST1 VAG (ANA. GND) RXI TXO RFO CF VQB * Indicates trimmed resistor CURRENT MIRROR CURRENT MIRROR CURRENT MIRROR CURRENT MIRROR CURRENT MIRROR Order this document by MC33121/D MOTOROLA SEMICONDUCTOR TECHNICAL DATA ORDERING INFORMATION MC33121 P SUFFIX PLASTIC PACKAGE CASE 738 FN SUFFIX PLCC CASE 776 MC33121P MC33121FN Plastic DIP PLCC – 40 ° to + 85°C Device Temperature Range Package 20 1 28 1 © Motorola, Inc. 1996 REV 1.0 4/96 |
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