U3761MB Datasheet, PDF (8/23 Pages) TEMIC Semiconductors – Low Voltage Standard Telephone Circuit with 13 Memories

U3761MB
SDIP40 SSO44 Symbol
30
32
OUT
31
33
VDD
32
36
HKS
33
37
BM
34
38 MODE
35
39
DP
36
40
Mask
Configuration
VRING
30V
6.5K
PD
Function
Buzzer output
200
OUT
50V
PD
VDD
6V
PD
HKS
B/M
MODE
DP
Ê^VL Supply output for dialer part
Ê 6V
PD
PD
DP
Hook switch input.
HKS = 1: On-hook state. Chip in
sleep mode, no operation.
HKS = 0: Off-hook state. Chip
W ^{enable for normal operation with a}
pull-high resistor of about 4 M .
If BM = floating pulse dialing with
3:2 B/M ratio
If BM is connected to ground pulse
dialing with a B/M ratio of 2:1
Pulling mode pin to V_DD places the
dialer in tone mode. Pulling mode
pin to GND places the dialer in
DTMF with 140 ms inter-tone
pause. If the mode pin is left
floating, the dialer is in pulse mode
( 10 ppS)
N-channel open drain pulse dialing
output. Flash key will cause DP to
be active in either DTMF mode or
pulse mode.
Short mute during pulse dialing
8 (23)
TELEFUNKEN Semiconductors
Preliminary Information
Rev. A2, 23-Apr-97