L3234 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

L3234

HIGHLY INTEGRATED SLIC KIT TARGETED TO PABX AND KEY SYSTEM APPLICATIONS

STMicroelectronics 

L3234 - L3235

L3235

Subscriber Line Interface Circuit

DESCRIPTION

Circuit description

The L3235 Subscriber Line Interface Circuit

(SLIC) is a bipolar integrated circuit in 60V tech-

nology optimized for PABX application.

The L3235 supplies a line feed voltage with a cur-

rent limitation which can be modified by an exter-

nal resistor (RLIM).

The SLIC incorporates loop currents, ground key

detection functions with an externally programma-

ble constant time.

The two to four wires and four to two wires voice

frequency signal conversion is performed by the

L3235 and the line terminating and the balancing

impedances are externally programmable.

The device integrates an automatic power limita-

tion circuit. In short loop condition the extra power

is dissipated on one external transistor (Text).

This aproach allows to assembly the L3235 in a

low cost standard plastic PLCC28 package.

The chip is protected by thermal protection at

Tj = 150°C.

The SLIC is able to give a power up command for

Combo in off hook condition and an enable logic

for solid state ringing injector L3234.

The L3235 package is 28 pin plastic PLCC.

The L3235 has been designed to operate

togheter with L3234 performing complete

BORSHT function without any electromechanical

ringing relay (see the application circuit fig. 16).

PLCC28

PIN CONNECTION

ABSOLUTE MAXIMUM RATINGS

Symbol

Parameter

VBAT

Battery Voltage

VCC

Positive Supply Voltage

VSS

Negative Supply Voltage

Tj

Max. Junction Temperature

Tstg

Storage Temperature

OPERATING RANGE

Value

-54

5.5

-5.5

150

-55 to +150

Symbol

VBAT

VCC

VSS

Top

Tj

Parameter

Battery Voltage

Positive Supply Voltage

Negative Supply Voltage

Operating Temperature for L3235

L3235T

Max Junction Operating Temperature

Min.

-52

4.75

-5.25

0

-40

Max.

-24

5.25

-4.75

70

85

130

Note: Operating ranges define those limits between which the functionality of the device is guaranteed.

Unit

V

V

V

°C

°C

Unit

V

V

V

°C

°C

°C

11/26

Share Link: