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MC33121

Motorola
Part Number MC33121
Manufacturer Motorola
Description LOW VOLTAGE SUBSCRIBER LOOP INTERFACE CIRCUIT
Published Jul 25, 2005
Detailed Description MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MC33121/D MC33121 Low Voltage Subscriber Loop Interface ...
Datasheet PDF File MC33121 PDF File

MC33121
MC33121

Overview
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 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 TIP CP VEE TSI RSI VCC RING CN BN EN – + – + VDD (+5.
0 V) VDG (DIG.
GND) PDI/ST2 ST1 20 1 P SUFFIX PLASTIC PACKAGE CASE 738 28 FN SUFFIX PLCC CASE 776 1 ORDERING INFORMATION Device MC33121P MC33121FN Temperature Range – 40° to + 85°C Package Plastic DIP PLCC * CURR...


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