LTC1387 데이터 시트보기 (PDF) - Linear Technology
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LTC1387 Datasheet PDF : 12 Pages
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LTC1387
BLOCK DIAGRAM
RS232 MODE
WITHOUT LOOPBACK
RS485 MODE
WITHOUT LOOPBACK
RS232 MODE
WITH LOOPBACK
1
20
1
20
1
C1
2
19
C2 C1
2
19
C2 C1
2
VDD
3
4
A
5
B
Y6
Z7
8
485/232
DXEN 9
GND 10
18 VCC VDD
3
17
RA
16
RB
A4
5
B
15
DY
14
DZ
13
ON
Y6
Z7
8
485/232*
12
RXEN
11 VEE
DXEN 9
GND 10
18 VCC
17
RA
VDD 3
16
RB
15
DY
Y6
14
SLEW
13
ON
12
RXEN
11 VEE
Z7
8
485/232
DXEN* 9
GND 10
20
1
19
C2 C1
2
18 VCC
VDD 3
17
RA
16
RB
15
DY
Y6
14
DZ
13
ON
Z
485/232*
7
8
12
RXEN*
DXEN*
9
11 VEE
GND 10
RS485 MODE
WITH LOOPBACK
20
19
C2
18 VCC
17
RA
16
RB
15
DY
14 SLEW
13
ON
12
RXEN*
11 VEE
*485/232, DXEN, RXEN = VCC
LTC1387 • BD
TEST CIRCUITS
Y
R
VOD
R VOC
Z
LTC1387 • F01
Figure 1. RS485 Driver
Test Load
SLEW
D
Y
RL
Z
CL A
R
CL B
15pF
485 = 3V, DXEN = 3V, RXEN = 3V
Figure 2. RS485 Driver/Receiver
Timing Test Circuit
LTC1387 • F02
DR OUT
VCC
S1
500Ω
CL
S2
LTC1387 • F03
Figure 3. RS485 Driver Output
Enable/Disable Timing Test Load
D
Y, Z
CL
RL
232 = 0V, DXEN = 3V
LTC1387 • F04
Figure 4. RS232 Driver
Timing Test Circuit
D
Y, Z A, B
R
232 = 0V, DXEN = 3V, RXEN = 3V
Figure 5. RS232 Receiver
Timing Test Circuit
15pF
LTC1387 • F05
RECEIVER
OUT
VCC
S1
1k
CL
S2
LTC1387 • F06
Figure 6. Receiver Output
Enable/Disable Timing Test Load
7
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