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ManualsBrandsLINEAR TECHNOLOGY ManualsInterface ICsInterface IC - transceivers RS232, RS485 3/3 PDIP 28
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8
LTC1334
BLOCK DIAGRA SM
W
Interface Configuration with Loopback Disabled
Interface Configuration with Loopback Enabled
PORT 1 = RS232 MODE
PORT 2 = RS232 MODE
LB
20
21
14
R
B1
C2C1
R
A1
D
Z1
D
Y1
B1
A1
V
DD
V
CC
SEL1 = 0V
27
281
4
2
3
6
7
8
26
24
23
22
ON
V
EE
15
Y1
Z1
5
25
D
Y2
D
Z2
R
A2
R
B2
D
Y2
D
Z2
R
A2
R
B2
Y2
Z2
SEL2 = 0V
12
13
10
9
18
17
16
B2
A2
GND
11
19
LTC1334 • BD01
V
DD
V
DD
V
DD
PORT 1 = RS485 MODE
PORT 2 = RS232 MODE
LB
20
21
14
R
B1
C2C1
R
A1
DE1
D
Y1
B1
A1
V
CC
SEL1 = 5V
27
281
4
2
3
6
7
8
26
24
23
22
ON
V
EE
15
Y1
Z1
5
25
Y2
Z2
SEL2 = 0V
12
13
10
9
18
17
16
B2
A2
GND
11
19
PORT 1 = RS232 MODE
PORT 2 = RS485 MODE
LB
20
21
14
R
B1
C2C1
R
A1
D
Z1
D
Y1
B1
A1
V
CC
SEL1 = 0V
27
281
4
2
3
6
7
8
26
24
23
22
ON
V
EE
15
Y1
Z1
5
25
D
Y2
DE2
R
A2
R
B2
Y2
Z2
SEL2 = 5V
12
13
10
9
18
17
16
B2
A2
GND
11
19
PORT 1 = RS485 MODE
PORT 2 = RS485 MODE
LB
20
21
14
R
B1
C2C1
R
A1
DE1
D
Y1
B1
A1
V
CC
SEL1 = 5V
27
281
4
2
3
6
7
8
26
24
23
22
ON
V
EE
15
Y1
Z1
5
25
D
Y2
DE2
R
A2
R
B2
Y2
Z2
SEL2 = 5V
12
13
10
9
18
17
16
B2
A2
GND
11
19
PORT 1 = RS232 MODE
PORT 2 = RS232 MODE
20
21
14
R
B1
C2C1
R
A1
D
Z1
D
Y1
V
DD
V
CC
SEL1 = 0V
27
281
2
3
6
7
8
26
24
23
22
ON
V
EE
15
Y1
Z1
25
D
Y2
D
Z2
R
A2
R
B2
D
Y2
D
Z2
R
A2
R
B2
Y2
Z2
SEL2 = 0V
10
9
18
17
16
GND
11
19
LTC1334 • BD02
V
DD
V
DD
V
DD
PORT 1 = RS485 MODE
PORT 2 = RS232 MODE
20
21
14
R
B1
C2C1
R
A1
DE1
D
Y1
V
CC
SEL1 = 5V
27
281
2
3
6
7
8
26
24
23
22
ON
V
EE
15
Y1
Z1
25
Y2
Z2
SEL2 = 0V
10
9
18
17
16
GND
11
19
PORT 1 = RS232 MODE
PORT 2 = RS485 MODE
20
21
14
R
B1
C2C1
R
A1
D
Z1
D
Y1
V
CC
SEL1 = 0V
27
281
2
3
6
7
8
26
24
23
22
ON
V
EE
15
Y1
Z1
25
D
Y2
DE2
R
A2
R
B2
Y2
Z2
SEL2 = 5V
10
9
18
17
16
GND
11
19
PORT 1 = RS485 MODE
PORT 2 = RS485 MODE
20
21
14
R
B1
C2C1
R
A1
DE1
D
Y1
V
CC
SEL1 = 5V
27
281
2
3
6
7
8
26
24
23
22
ON
V
EE
15
Y1
Z1
25
D
Y2
DE2
R
A2
R
B2
Y2
Z2
SEL2 = 5V
10
9
18
17
16
GND
11
19
LBLBLBLB