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MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

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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鈥搘ire side of

a central office, or PBX, and the 2鈥搘ire 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鈥搘ire and 2鈥搘ire).

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鈥揇arlington).

The MC33121 is available in a 20 pin DIP and a 28 pin PLCC surface mount

package.

鈥?/div>

58 dB Longitudinal Balance Guaranteed; 4鈥搘ire and 2鈥搘ire

Transmit, Receive, and Transhybrid Gains Externally Adjustable

Return Loss Externally Adjustable

Proper Hookswitch Detection With 30 k鈩?Leakage

Single/Double Fault Indication With Shutdown for Thermal Protection

Critical Sense Resistors Included Internally

Standard Power Supplies: 鈥?21.6 V to 鈥?42 V, and + 5.0 V,

鹵

10%

On鈥揌ook Transmission

Power Down Input (TTL and CMOS Compatible)

Operating Ambient Temperature: 鈥?40擄C to + 85擄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

鈥?/div>

+

鈥?/div>

+

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

鈥?40擄 to + 85擄C

Package

Plastic DIP

PLCC

*

CURRENT

MIRROR

CURRENT

MIRROR

CURRENT

MIRROR

*

HOOK STATUS AND

FAULT DETECTION

AND BIAS CONTROL

BIAS

+

鈥?/div>

+

鈥?/div>

VAG

(ANA. GND)

RXI

TXO

RFO

CF

VQB

*

CURRENT

MIRROR

CURRENT

MIRROR

CURRENT

MIRROR

VEE

(BATTERY)

*

MC33121

* Indicates trimmed resistor

REV 1.0

4/96

漏

Motorola, Inc. 1996

MOTOROLA

MC33121

1

MC33121FN

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