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L3240B1 반도체 회로 부품 판매점

ELETRONIC TWO-TONE RINGER



STMicroelectronics 로고
STMicroelectronics
L3240B1 데이터시트, 핀배열, 회로
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


L3240B1 데이터시트, 핀배열, 회로
L3240
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol
VAB
VAB
DC
Top
Tstg
Parameter
Calling Voltage (f = 50 Hz) Continuous
Calling Voltage (f = 50 Hz) 5s N/10s OFF
Supply Current
Operating Temperature
Storage and Junction Temperature
Value
120
200
30
– 20, + 70
– 65, + 150
Unit
VRMS
VRMS
mA
oC
oC
THERMAL DATA
Symbol
Rth j-amb
Parameter
Thermal Resistance Junction-ambient
Max.
Value
100
Unit
oC/W
ELECTRICAL CHARACTERISTICS
(Tamb = 25oC ; VS = applied between pins 7-2 ;otherwise specified)
Symbol
Vs
IB
VON
VOFF
RD
VOUT
IOUT
Vs
Parameter
Supply Voltage
Current Consumption Without Load (Pins 8-1)
Activation Voltage
Sustaining Voltage
Differential Resistance in OFF Condition (Pins 8-1)
Output Voltage Swing
Short Circuit Current (pins 5-6)
Voltage Drop between Pins 8-1 and Pins 7-2
Test Conditions Min.
V8-1 = 16.5 to 29.5 V
12
7.8
6.4
Vs = 20 V
Typ.
1.5
Vs – 5
35
3
Max.
26
1.8
13.5
9.3
Unit
V
mA
V
V
k
V
mA
V
2/6




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L3240B1

ELETRONIC TWO-TONE RINGER - STMicroelectronics