LTC1321 LINER [Linear Technology], LTC1321 Datasheet - Page 9

• Manufacturer Part Number: LTC1321
• Description: RS232/EIA562/RS485 Transceivers
• Manufacturer: LINER [Linear Technology]

FU CTIO TABLES
BLOCK DIAGRA
LTC1335
RS485 Driver Mode
RS485 Receiver Mode
SEL1
SEL2
GND
* SEL1/SEL2 = V
ON/OFF
ON/OFF
V
A1
Y1
Y2
A2
DD
1
1
1
1
0
1
1
1
1
0
U
10
12
7
8
1
3
5
6
PORT 1 = EIA562 MODE
PORT 2 = EIA562 MODE
SEL
CC
1
1
1
1
1
INPUTS
SEL
U
1
1
1
1
1
DE
1
1
1
0
X
INPUTS
24
22
20
19
18
17
15
13
OE
0
0
0
1
X
D
0
1
X
X
X
V
R
D
LB
ON
R
V
D
CC
EE
A1
Y1
Y2
A2
W
SM
*SEL1
SEL2
CONDITION
GND
V
Inputs Open
Y2
A2
DD
B1
A1
Z1
Y1
No Fault
No Fault
< – 0.2V
LINE
Fault
> 0.2V
A – B
X
X
10
12
X
X
LTC1321 Interface Configuration Without Loopback
8
6
7
1
2
3
4
5
PORT 2 = EIA562 MODE
PORT 1 = RS485 MODE
OUTPUT
Y
0
1
Z
Z
Z
OUTPUTS
R
0
1
1
Z
Z
19
18
21
20
24
22
17
15
13
Z
1
0
Z
Z
Z
D
V
R
DE1
LB
ON
D
R
V
CC
Y1
EE
A1
Y2
A2
*SEL2
EIA562 Receiver Mode
EIA562 Driver Mode
SEL1
GND
V
ON/OFF
ON/OFF
DD
Y1
Y2
Z2
A1
A2
B2
1
1
1
0
1
1
1
1
0
10
11
12
1
3
5
6
7
8
9
PORT 1 = EIA562 MODE
PORT 2 = RS485 MODE
LTC1321/LTC1322/LTC1335
INPUTS
SEL
SEL
0
0
0
0
0
0
0
0
0
INPUTS
15
13
24
22
20
19
18
17 1
16
D
0
1
X
X
OE
0
0
0
1
X
D
R
V
V
R
D
LB
ON
DE2
EE
Y2
A2
CC
A1
Y1
*SEL2
*SEL1
GND
V
CONDITION
DD
B2
B1
A1
Y2
Z2
A2
Z1
Y1
Input Open
No Fault
No Fault
LINE
Fault
A OR B
X
10
12
11
X
X
1
2
3
4
6
7
8
9
0
1
5
PORT 1 = RS485 MODE
PORT 2 = RS485 MODE
OUTPUT
OUTPUT
Y, Z
R
1
0
Z
Z
1
0
1
Z
Z
16
19
18
17
15
13
21
20
24
22
1321BD01
9
DE1
D
LB
ON
D
DE2
R
V
V
R
Y2
EE
Y1
A2
CC
A1