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| U3760MB Datasheet, PDF (15/19 Pages) TEMIC Semiconductors – Low-Voltage Standard Telephone Circuit | |||
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U3760MB
Electrical Characteristics Tone Ringer
fRCK = 4 kHz, VRING = 20 V, Tamb = 25_C, reference point GND, unless otherwise specified
Parameters
Test Conditions / Pins Symbol Min.
Typ.
Max.
Unit
Supply current,
outputs open
VRIAC = 20 V
IRING
2.1
3.8
mA
Switch-on threshold
Switch-off threshold
Ringing frequency
VRIAC
VRIAC
R = 150 kâ¦, C = 1 nF
VRIAC > VRON
Audio sequence frequency
Turn-off delay
See figure 8
VRon
23.5
V
VRoff
5.6
V
f1H
937
1010 1083
Hz
f1L
752
808
868
Hz
f2
11.5
12.5
14.0
Hz
toff
65
ms
Volt
12459
VRING
0
t
VRIAC
0
t
OUT
Melody
t
0
toff
Figure 8. Turn off delay time
Rev. A3, 19-Feb-98
15 (19)
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