U4076B Datasheet, PDF (3/6 Pages) TEMIC Semiconductors – Three-Tone Ringer for Telephone Sets

U4076B
Pin 13 (15): Output signal shape
Output signal has different duty cycles according to the
position of Pin 13 (15). When grounded it has a duty cycle
of 1:1. When using a dynamic loudspeaker (activa-
tion via transformer/capacitor), a reduced signal
is recommended. This can be achieved by connecting a
capacitor greater than 1 nF between Pin 13 (15) and
ground.
Pin 14 (16): Switched on/off
Switched on/off is controlled by Pin 14 (16). The dc
voltage on the charge capacitor between Pin 4 (5) and 6
(7) is loaded a dummy load as long as the tone ringing is
not switched-on. In on-position (amplitude and frequency
recognition), Pin 14 (16) is connected internally with
Pin 4 (5) and the dummy load is switched-off. In
off-position, Pin 14 (16) is connected with Pin 6 (7)
internally and the dummy load is switched on.
Overload protection
The integrated circuit can withstand an ac voltage of
110 V / 50 Hz for 15 seconds between terminals a and b.
The circuit will not be damaged by a surge voltage test
with the following conditions:
Charging voltage of surge capacitance: V_cs = 2 kV
Pulse shape: 10/700 µs
Pulse sequence: 30 s
No of surges: 10
Polarity change after five surges
15W
25W
2 kV
10 mF
110W
0.22 mF
a
Tone ringing
Figure 1
b
Figure 2. Surge voltage test circuit
93 7575 e
Absolute Maximum Ratings
Reference point Pin 4 (5) unless otherwise specified
Parameters
Symbol
Value
Unit
Supply current
Output current
Pins 5 and 7 (6, 8)
Pins 11 and 12 (12, 13)
"IS
I₀
50
50
mA
mA
Junction temperature
T_j
125
°C
Ambient temperature range
T_amb
– 25 to + 60
°C
Storage temperature range
T_stg
– 40 to + 125
°C
Power dissipation
T_amb = 60 °C
DIP14
SO16-L
P_tot
860
mW
P_tot
720
mW
Thermal Resistance
Junction ambient
DIP14
SO16-L
Parameters
Symbol
R_thJA
R_thJA
Value
75
90
Unit
K/W
K/W
TELEFUNKEN Semiconductors
3 (6)
Rev. A1, 15-May-96
Preliminary Information