This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

Janauary 1995

HIGHLY INTEGRATED SUBSCRIBER LINE

INTERFACE KIT FOR PABX AND KEY SYS-

TEM APPLICATIONS

IMPLEMENTS ALL KEY ELEMENTS OF THE

BORSCHT FUNCTION

INTEGRATED ZERO CROSSING BALANCED

RINGING INJECTION ELIMINATES EXTER-

NAL RELAY AND CENTRALISED RINGING

GENERATOR

ZERO NOISE INJECTED ON ADJACENT

LINES DURING RINGING SEQUENCE

LOW POWER IN STANDBY AND ACTIVE

MODES

BATTERY FEED WITH PROGRAMMABLE

LIMITING CURRENT

PARALLEL LATCHED DIGITAL INTERFACE

SIGNALLING

FUNCTIONS

(OFF

HOOK,

GND-KEY)

LOW NUMBER OF EXTERNAL COMPO-

NENTS

INTEGRATED THERMAL PROTECTION

INTEGRATED OVER CURRENT PROTEC-

TION

0

°CTO 70°C: L3234/L3235

-40

°CTO 85°C: L3234T/L3235T

DESCRIPTION

The L3234/L3235 is a highly integrated SLIC KIT

targeted to PABX and key system applications

The kit integrates the majority of functions re-

quired

to

interface

a

telephone line.

The

L3234/L3235 implements the main features of the

broths function:

- Battery Feed (Balanced Mode)

- Ringing Injection

- Signalling Detection

- Hybrid Function

The Kit comprises 2 devices, the L3234 ringing

injector fabricated in Bipolar in 140V Technology.

Its function is to amplify and inject in balanced

mode with zero crossing the ringing signal. The

device requires an external positive supply of

100V and a low level sinusoid of approx.

950mVrms. The L3235 Line Feeder is integrated

in 60V Bipolar Technology. The L3235 provides

battery feed to the line with programmable current

limitation. The two to four wire voice frequency

signal conversion is implemented by the L3235

and line terminating and balance impedances are

externally programmable. The L3234/L3235 kit is

designed for low power dissipation. In a short

loop condition the extra power is dissipated on an

external transistor. The Kit is controlled by five

wire parallel bus and interfaces easily to all first

and programmable second generation COMBOS.

(see figg. 1 and 2)

HEPTAWATT

ORDERING NUMBER: L3234

PLCC28

ORDERING NUMBER: L3235

L3234

L3235

HIGHLY INTEGRATED SLIC KIT TARGETED TO PABX

AND KEY SYSTEM APPLICATIONS

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