Datasheet

9
LTC1321/LTC1322/LTC1335
FU CTIO TABLES
UU
LTC1321 Interface Configuration Without Loopback
1321BD01
R
A1
V
CC
V
DD
A1
D
Y1
ON
* SEL1/SEL2 = V
CC
Y1
PORT 1 = EIA562 MODE
PORT 2 = EIA562 MODE
D
Y2
Y2
SEL1
SEL2
24
22
1
3
5
6
7
8
20
19
LB
18
17
GND
V
EE
12
13
R
A2
A2
10
15
PORT 1 = RS485 MODE
PORT 2 = RS485 MODE
V
DD
B1
A1
Z1
Y1
1
2
3
4
5
6
7
8
9
12
10
11
D
Y1
6
R
A1
V
CC
V
DD
B1
A1
DE1
ON
Z1
Y1
PORT 1 = RS485 MODE
PORT 2 = EIA562 MODE
D
Y2
Y2
*SEL1
SEL2
24
22
1
2
3
5
4
7
8
21
20
LB
18
19
17
GND
V
EE
12
13
R
A2
A2
10
15
D
Y1
R
A1
V
CC
DE1
ON
D
Y2
DE2
24
22
21
20
LB
17
19
18
16
V
EE
13
R
A2
15
R
A1
V
CC
V
DD
A1
D
Y1
ON
DE2
Y1
PORT 1 = EIA562 MODE
PORT 2 = RS485 MODE
D
Y2
SEL1
24
22
1
3
5
6
7
8
9
20
19
LB
18
17
1
16
12
13
10
11
15
Y2
Z2
GND
V
EE
R
A2
B2
A2
Y2
Z2
A2
GND
B2
*SEL2
*SEL2
*SEL1
RS485 Receiver Mode
OUTPUT
ON/OFF SEL OE A – B R
1 1 0 < –0.2V 0
1 1 0 > 0.2V 1
1 1 0 Inputs Open 1
111 X Z
01X X Z
RS485 Driver Mode
INPUTS LINE OUTPUTS
ON/OFF SEL DE D CONDITION Y Z
1 1 1 0 No Fault 0 1
1 1 1 1 No Fault 1 0
1 1 1 X Fault Z Z
110X X ZZ
01XX X ZZ
INPUTS
LTC1335
BLOCK DIAGRA SM
W
EIA562 Driver Mode
INPUTS LINE OUTPUT
ON/OFF SEL D CONDITION Y, Z
1 0 0 No Fault 1
1 0 1 No Fault 0
1 0 X Fault Z
00X X Z
INPUTS
EIA562 Receiver Mode
OUTPUT
ON/OFF SEL OE A OR B R
100 0 1
100 1 0
1 0 0 Input Open 1
101 X Z
00X X Z