LTC1321 LINER [Linear Technology], LTC1321 Datasheet - Page 11

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

Figure 4. EIA/TIA-562 Driver
Timing Test Circuit
BLOCK DIAGRA
*V
Figure 1. RS485 Driver
Test Load
TEST CIRCUITS
DD
SEL2
SEL1
Y
Z
**
GND
*
/OE
Y2
Z2
Y1
Z1
FOR LTC1322 ONLY, PIN 1 IS V
FOR LTC1335, PIN 1 IS OE, AND V
SEL1/SEL2 = V
D
V
0V
OD
12
SEL
1
4
5
9
6
7
8
PORT 1 = EIA562 MODE
PORT 2 = EIA562 MODE
Y OR Z
*
CC
R
R
1321/22/35 F01
.
V
OC
C
L
1321/22/35 F04
19
18
17
16
15
14
13
24
23
22
21
20
DD
R
L
, AND OE IS ALWAYS ENABLED.
DD
ON
D
D
R
R
V
R
R
D
D
LB
V
W
IS CONNECTED TO V
A2
CC
Y2
Z2
B2
EE
B1
A1
Z1
Y1
SM
*V
**SEL1
DD
SEL2
GND
/OE
LTC1322/LTC1335 Interface Configuration With Loopback
Y1
Y2
Z1
Z2
D
12
4
7
8
9
3V
3V
1
5
6
PORT 2 = EIA562 MODE
PORT 1 = RS485 MODE
DE
CC
SEL
Figure 2. RS485 Driver/Receiver
Timing Test Circuit
*
.
Figure 5. EIA/TIA-562 Receiver
Timing Test Circuit
D
Y
Z
0V
SEL
Y OR Z
R
L
19
14
13
22
21
20
18
16
15
24
23
17
A OR B
R
V
R
V
R
DE1
D
ON
D
R
LB
D
B2
EE
CC
B1
A1
Y2
A2
Y1
Z2
C
C
0V
0V
L
L
*V
SEL
OE
**SEL2
DD
SEL1
GND
R
/OE
Y1
B
Z1
Y2
A
Z2
3V
0V
1321/22/35 F05
SEL
12
OE
1
4
5
6
7
8
9
PORT 1 = EIA562 MODE
PORT 2 = RS485 MODE
R
15pF
*
LTC1321/LTC1322/LTC1335
1321/22/35 F02
15pF
18
16
19
17
15
14
13
24
23
22
21
20
ON
D
DE2
R
R
V
R
R
D
D
LB
V
A2
CC
B1
A1
Z1
Y1
Y2
B2
EE
Figure 6. Receiver Output
Enable/Disable Timing Test Load
Figure 3. RS485 Driver Output
Enable/Disable Timing Test Load
*V
DR OUT
RX OUT
**SEL1
**SEL2
DD
GND
/OE
Z1
Y1
Z2
Y2
12
1
4
5
6
7
8
9
PORT 1 = RS485 MODE
PORT 2 = RS485 MODE
*
C
500
C
L
L
1k
1321/22/35 F06
1321/22/35 F03
V
V
CC
CC
S1
S2
S2
S1
11
19
18
16
24
22
20
17
15
14
13
23
21
1322/35 BD02
ON
R
V
R
DE1
D
LB
D
DE2
R
V
R
A1
Y1
Y2
A2
B2
EE
CC
B1