CF8223A
OSCIN input timing (when external input)
t
WL
V
DD
t
WH
0.7V
DD
0.5V
DD
0.3V
DD
OSCIN
V
SS
t
f
t
f
FSK receive timing (1)
1st Ring
Tip/Ring
Ch. seizure Mark Data packet
1010101... 111...
2nd Ring
Data
RDET
t
DED
DV
t
AF
FSK/DTMF
t
HF
t
ADD
DOUT
Data
Data output has
no Ch.seizure signal.
t
DPD
PDWN
t
DOSC
OSCOUT
FSK receive timing (2)
Start bit
LSB
MSB
Stop bit
Tip/Ring
b6 b7 1
0 b
0
b
1
b
2
b
3
b
4
b
5
b
6
b
7
1
0 b
0
b
1
t
ADD
DOUT
b4 b5 b6 b7 1
0
b
0
b
1
b
2
b
3
b
4
b
5
b
6
b
7
1
0
b
0
b
1
NIPPON PRECISION CIRCUITS INC.—6