U3760MB Datasheet, PDF (7/19 Pages) TEMIC Semiconductors – Low-Voltage Standard Telephone Circuit

U3760MB
SDIP40 SSO44 Symbol
Function
Configuration
28
30 VRING DC supply voltage for the tone
ringer is limited to 30 V with
integrated Z-diode.
VRING
30V
6.5K
200
PD
29
31
RCK RC clock oscillator for ringer
30
32
OUT Buzzer output
OUT
ÊÊÊÊÊ ^50V
PD
3.4V
0.8V
RCK
6V
6V
PD
VRING
200
30V
6.5K
PD
31
33 VDD 1 Supply output of dialer section
32
34 VDD 2 Supply input of dialer section
OUT
50V
PD
VDD1
6V
PD
VDD2
Ê^VL
Ê 6V
33
36
HKS Hook switch input.
HKS = 1: On-hook state. Chip in
sleep mode, no operation.
HKS = 0: Off-hook state. Chip en-
HKS
able for normal operation.
34
37
BM If BM = floating pulse, dialing with
3:2 B/M ratio
If BM is connected to ground,
B/M
pulse dialing with a B/M ratio of
2:1
35
38
MODE Pulling mode pin to V_DD places the
dialer in tone mode. Pulling mode
pin to GND places the dialer in
pulse mode ( 20 ppS ). If the mode
pin is left floating, the dialer is in
MODE
pulse mode ( 10 ppS)
36
39
DP N-channel open drain pulse dialing
output. Flash key will cause DP to
be active in either DTMF mode or
DP
pulse mode.
PD
PD
PD
DP
Rev. A3, 19-Feb-98
7 (19)