U3761MB Datasheet, PDF (16/23 Pages) TEMIC Semiconductors – Low Voltage Standard Telephone Circuit with 13 Memories

U3761MB
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1. The dialer will execute flash break and all the flash pause time before the next digits is dialed out.
2. The flash key can be stored as a digit in memory, however, only one flash will be releases to users.
3. The system will return to the initial state after the flash pause time is finished.
Low
HKS
KEY IN
F
F
3
t_KID
t_FB
DP
t_FP
t_FP
T/P MUTE
MASK
DTMF
OSC
t_ITP
Oscillation
Figure 10. Flash operation
t_KID
t_KRD
t_PDP
t_IDP
t_TD
= key active in debounce
= key release debounce
= pre-digit pause
= inter-digit pause
= DTMF output duration
t_ITP = intertone pause
t_FB = flash break time
t_FP = flash pause time
t_P = pause time
Absolute Maximum Ratings
Parameters
Line current
DC line voltage
Junction temperature
Ambient temperature
Storage temperature
Total power dissipation, T_amb = 60°C
Junction ambient
SSO44
SDIP40
SSO44
SDIP40
Symbol
I_L
V_L
T_j
T_amb
T_stg
P_tot
P_tot
R_thJA
R_thJA
Value
140
14
125
– 25 to + 75
– 55 to + 150
0.9
1.3
70
50
13410
Unit
mA
V
°C
°C
°C
W
W
K/W
K/W
16 (23)
TELEFUNKEN Semiconductors
Preliminary Information
Rev. A2, 23-Apr-97