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PDF L3235 Data sheet ( Hoja de datos )

Número de pieza L3235
Descripción HIGHLY INTEGRATED SLIC KIT TARGETED TO PABX AND KEY SYSTEM APPLICATIONS
Fabricantes STMicroelectronics 
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No Preview Available ! L3235 Hoja de datos, Descripción, Manual

L3234
L3235
HIGHLY INTEGRATED SLIC KIT TARGETED TO PABX
AND KEY SYSTEM APPLICATIONS
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°C TO 70°C: L3234/L3235
-40°C TO 85°C: L3234T/L3235T
HEPTAWATT
ORDERING NUMBER: L3234
PLCC28
ORDERING NUMBER: L3235
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)
Janauary 1995
1/26
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

1 page




L3235 pdf
PIN CONNECTION (Top view)
L3234 - L3235
7
6
5
4
3
2
1
ABSOLUTE MAXIMUM RATINGS
Symbol
V100
VCC
VA
CS
Tj
Tstg
Parameter
Positive Power Supply Voltage
5V Power Supply Voltage
Low Voltage Ringing Signal (with V100 = 120Vdc)
Logical Ring Drive Input
Max. Junction Temperature
Storage Temperature
D94TL131
OUT2
V100
OUT1
GND
VCC
CS
VA
Value
+120
5.5
1.4
VCC
150
-55 to +150
Unit
V
V
Vrms
oC
oC
OPERATING RANGE
Symbol
V100
VCC
Parameter
High Power Supply Voltage
Low Power Supply Voltage
VA Low Voltage Ringing Signal
To p
Operating Temperature for L3234
L3234T
Tjop Max. Junction Operating Temperature (due to thermal protection)
Value
95 to 105
5 ±5%
600 to 950
within 10Hz - 100Hz
0 to 70
-40 to 85
130
Note: Operating ranges define those limits between which the functionality of the device is guaranteed.
THERMAL DATA
Symbol
Rth j-case
Rth j-amb
Description
Thermal Resistance Junction-case
Thermal Resistance Junction-ambient
Max.
Max.
Value
4
50
PIN DESCRIPTION
Pin Name
1 VA
2 CS
3 VCC
4 GND
5 OUT1
6 V100
Description
Low Voltage Ringing Signal Input
Logical Ring Drive Input
+5V Low Power Supply
Common Analog-Digital Ground
Ringing Signal Output
+100V High Power Supply
Unit
V
V
Vrms
°C
°C
°C
Unit
oC/W
oC/W
5/26

5 Page





L3235 arduino
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
VCC
VSS
Tj
Battery Voltage
Positive Supply Voltage
Negative Supply Voltage
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

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