u3762mb ETC-unknow, u3762mb Datasheet - Page 4

• Manufacturer Part Number: u3762mb
• Description: Universal Telephone Functions Integrated
• Manufacturer: ETC-unknow

U3762MB
4 (23)
Pin
10
1
2
3
4
5
6
7
8
9
Symbol
Earth
MFO
HFO
HFI
XT
XT
C1
C2
C3
C4
Keyboard input
Earth key ( 604 ms high pulse, 1 s pause)
Input with 200 k
HFI triggers HFO with each LH edge.
Output will be toggled by each LH edge at
HFI.
A built-in inverter provides oscillation with an
inexpensive 3.579545-MHz crystal or ceramic
resonator
Output of DTMF
DTMF output frequency
R
R
R
R
C
C
C
1
2
3
4
1
2
3
Specified Actual
1209
1336
1477
(Hz)
697
770
852
941
Preliminary Information
W
1216
1332
1472
(Hz)
pull-down resistor.
Function
699
766
848
940
+0.28
–0.52
–0.47
–0.10
+0.57
–0.30
–0.34
Error
(%)
HFI
EARTH
C2–C4
XT
XT
HFO
MFO
C1
Ê
Ê
Ê Ê
Ê Ê
Ê
Ê
Configuration
Ê
Ê
VDD
VDD
VDD
VDD
VDD
PD
PD
Ê Ê
VDD
PD = Protection Device
PD
PD
Ê
Ê
Ê
Ê
Ê
Ê
PD
VDD
VDD
VDD
VDD
Ê
Ê
VDD
VDD
Rev. A1, 15-Sep-98
VDD
PD
VDD
VDD
PD