S i 2 4 9 3 / 5 7 / 3 4 / 1 5 / 0 4
14
Rev. 0.6
RXCLK
DC
D
b
ESC
AOUT
RXD
R
E
S
ETb
XT
A
L
I
XT
A
L
O
XT
A
L
I
XT
A
L
O
RXD
RTSb
R
E
S
ETb
DC
D
b
RXD
TX
C
L
K
RTSb
IN
Tb
ESC
RI
b
E
ESD
AOUT
CL
K
O
U
T
CL
K
O
U
T
TX
D
TX
D
CTSb
CTSb
TX
D
CTSb
VD
A
VD
A
TX
C
L
K
RXCLK
RXCLK
E
ESD
RI
b
AOUT
TX
C
L
K
IN
Tb
ESC
R
E
S
ETb
DC
D
b
DC
D
b
IN
Tb
RI
b
AOUT
E
ESD
VDD
VDD
VDD
C1A
C2A
C1
A
C2
A
TIP
RING
C1A
C2A
Overlap
the 16-pin SOIC and 24-pin TSSOP
TXD
G
P
I
O5/RIb/TXCLK
-
RXD
CTSb
S
i2401
G
PIO3/ESC
-
G
P
IO2/DCDb
R
ESETb
-
G
P
I
O1/EOFR/RXCLK
-
"Si24x
x2G-DC Rev. 1.0 ISOmodem TM"
-
T
h
e
se components
f
o
r
internal
S
i
l
abs use only.
G
P
I
O4/INTb/AOUT
J
P
1
Function
Pin
1
3
5
7
9
11
13
2
4
8
10
12
14
16
T
h
e
se components
f
o
r
internal
S
i
l
abs use only.
R2
0
R2
3
C41
R1
8
1.
3
k
C52
C5
1
R1
9
0
JP
2
C40
U3
CLKIN/XTALI
1
XTALO
2
CLKOUT/A0/EECS
3
alt_RI/D6/TXCLK
4
VD3.3
5
GND
6
VDA
7
RTS/D7
8
VDB
19
GND
20
VD 3.3
21
C2A
13
C1A
14
ESC/D3
22
DCD/D4
23
EECLK/D5/RXCLK
24
CTS/CS/ALE
11
RXD/RD
9
TXD/WR
10
RESET
12
RI/D1
17
EEIO/D2
18
AOUT/INT
15
INT/D0
16
C5
0
C55
Y1
1
2
R2
1
C5
3
U1
Si2401
CLKIN/XTALI
1
XTALO
2
GPIO5/RI/TXCLK
3
VD3.3
4
RXD
5
TXD
6
CTS
7
RESET
8
C2A
9
C1A
10
GPIO4/INT/AOUT
11
GND
12
VA
13
GPIO3/ESC
14
GPIO2/CD
15
GPIO1/EOFR/RXCLK
16
+
C54
R2
2
JP
1
H
EAD
E
R
8
X
2
1
3
5
7
9
11
13
15
2
4
6
8
10
12
14
16
C5
6
FB
5
Figure
1
1.
Si2
4
9
3
/57/34
/1
5/04
Sc
hema
tic
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