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PDF L3240 Data sheet ( Hoja de datos )
| Número de pieza | L3240 | |
| Descripción | ELETRONIC TWO-TONE RINGER | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de L3240 (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
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L3240
ELETRONIC TWO-TONE RINGER
. LOW CURRENT CONSUMPTION, IN ORDER
. TO ALLOW THE PARALLEL OPERATION OF 4
DEVICES
INTEGRATED RECTIFIER BRIDGE WITH
ZENER DIODES TO PROTECT AGAINST
OVERVOLTAGES
. LITTLE EXTERNAL CIRCUITRY
. TONE AND SWITCHING FREQUENCIES AD-
JUSTABLE BY EXTERNAL COMPONENTS
. INTEGRATED VOLTAGE AND CURRENT
HYSTERESIS
. COMPLEMENTARY OUTPUT CONFIGURA-
TION
Minidip
SO8
ORDERING NUMBERS : L3240B1 (Minidip)
L3240D1 (SO8)
DE SCRI P TI O N
L3240 is a monolithic integrated circuit designed to
replace the mechanical bell in telephone sets, in
connectionwith an electro acoustical converter. The
device can drive either directly a piezo ceramic con-
verter (buzzer) or a small loudspeaker. In this case
a transformer is needed. The two tone frequencies
generated are switched by an internal oscillator in a
fast sequenceand made audible across output am-
plifiers in the transducer ; both tone frequencies and
the switching frequency can be externally adjusted.
The supply voltage is obtained from the AC ring sig-
nal and the circuit is designed so that noise on the
line or variations of the ringing signal cannot affect
the correct operation of the devices.
The output bridge configuration allows to use a high
impedance transducer with acoustical results much
better than in a single ended configuration.
The two outputs can also be connected inde-
pendently to different converters or actua-
tors (acoustical, opto, logic).
June 1993
PIN CONNECTION ( top view)
1/6
1 page  
SO8 PACKAGE MECHANICAL DATA
mm
DIM
Min.
Typ.
A
a1 0.1
a2
a3 0.65
b 0.35
b1 0.19
C 0.25
c1
D 4.8
E 5.8
e 1.27
e3 3.81
F 3.8
L 0.4
M
S
L3240
Max.
Min.
1.75
0.25 0.004
1.65
0.85 0.026
0.48 0.014
0.25 0.007
0.5 0.010
45o (typ.)
5.0 0.189
6.2 0.228
4.0 0.150
1.27 0.016
0.6
8o (max.)
inch
Typ.
0.050
0.150
Max.
0.069
0.010
0.065
0.033
0.019
0.010
0.020
0.197
0.244
0.157
0.050
0.024
5/6
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet L3240.PDF ] | |
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| Número de pieza | Descripción | Fabricantes |
| L3240 | ELETRONIC TWO-TONE RINGER | STMicroelectronics |
| L3240B1 | ELETRONIC TWO-TONE RINGER | STMicroelectronics |
| L3240D1 | ELETRONIC TWO-TONE RINGER | STMicroelectronics |
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