U3761MB Datasheet, PDF (4/23 Pages) TEMIC Semiconductors – Low Voltage Standard Telephone Circuit with 13 Memories

U3761MB
Pin Description
SDIP40 SSO44 Symbol
1
1
C1
2
2
C2
3
3
C3
4
4
C4
5
5
Earth
15
7, 6,
NC
34, 35
6
8
XT
Configuration
C1
PD
C2–C4
PD
XT
PD
XT
7
9
XT
XT
40P 40P
PD
PD
XT
8
10
MFO
40P 40P
PD
MFO
9
12
GND
Function
Keyboard input
Earth key
Not connected
A built-in inverter provides
oscillation with an inexpensive
3.579545 MHz crystal or ceramic
resonator
Output of DTMF
DTMF output frequency
Specified Actual
(HZ) (Hz)
R1 697
699
R2 770
766
R3 852
848
R4 941
948
C1 1209 1216
C2 1336 1332
C3 1477 1472
Ground
Error
(%)
+0.28
–0.52
–0.47
+0.74
+0.57
–0.30
–0.34
4 (23)
TELEFUNKEN Semiconductors
Preliminary Information
Rev. A2, 23-Apr-97