MAX1480 Maxim, MAX1480 Datasheet - Page 16

• Manufacturer Part Number: MAX1480
• Description: Complete / Isolated RS-485/RS-422 Data Interface
• Manufacturer: Maxim

Complete, Isolated RS-485/RS-422
Data Interface
Figure 13. Typical Half-Duplex RS-485/RS-422 Network
16
DE
RO
DI
OR EQUIVALENT
______________________________________________________________________________________
74HC86
RE
V
5V
IN
C1
22 F
RECEIVER OUTPUT
DRIVER ENABLE
DRIVER INPUT
RO
R
DE
0.1 F
A
C2
D
DI
B
R1
R2
R3
RE
LOGIC GROUND
GND1
GND2
V
V
V
V
V
CC1
CC2
CC3
CC4
CC5
SD
RO
D1
D2
FS
DE
DI
RO
10
11
12
13
14
R
1
2
3
4
5
6
7
8
9
DE
MAX845
A
ISOLATION BARRIER
MAX1480A/B/C
(ONE RESISTOR ON EACH END)
D
DI
B
TERMINATING RESISTOR
MAX1487
MAX487
28
27
16
26
25
24
23
22
21
20
19
18
17
15
AC1 (MAKE NO CONNECTION)
AC2 (MAKE NO CONNECTION)
ISO V
B
ISO RO DRV
A
ISO DE IN
ISO COM1
ISO DI DRV
ISO DE DRV
ISO COM2
ISO RO LED
ISO DI IN
ISO V
100
120
CC1
CC2
ISOLATED COMMON
A
B
R6
(ONE RESISTOR ON EACH END)
TERMINATING RESISTOR
R4
R5
R
RE
SH
B
A
D
120
100
NOTE: RESISTOR R7 PROTECTS
R7
DE
DI
RO
THE MAX1480A/B/C FROM
TRANSIENT CURRENTS
BETWEEN SHIELD AND
TRANSMISSION LINES.
SHIELD
(OPTIONAL)