Datasheet

MAX1480E/MAX1490E
±15kV ESD-Protected, Isolated RS-485/RS-422
Data Interfaces
16 ______________________________________________________________________________________
DI
100Ω
DE
RO
BA
R
D
RE
RO
DE
DI
R
120Ω
D
A
B
RERE
DI
DE
RO
BA
R
D
AC1 (MAKE NO CONNECTION)
AC2 (MAKE NO CONNECTION)
SHIELD
(OPTIONAL)
NOTE: RESISTOR R7 PROTECTS
THE MAX1480EA/MAX1480EC
FROM TRANSIENT CURRENTS
BETWEEN SHIELD AND
TRANSMISSION LINES.
ISO V
CC1
B
D2
D1
V
CC2
V
CC1
ISO RO DRV
A
B
A
SH
ISO DI IN
ISO DE IN
V
CC3
SD
FS
GND1
ISO COM1
ISO DI DRV
ISO V
CC2
ISO DE DRV
GND2
DE
V
CC4
DI
ISO COM2
ISO RO LED
V
CC5
RO
R4
R5
R7
100Ω
120Ω
R1
R2
R3
R6
V
IN
+5V
C1
22µF
C2
0.1µF
MAX1480EA/
MAX1480EC
LOGIC GROUND ISOLATION BARRIER ISOLATED COMMON
TERMINATING RESISTOR
(ONE RESISTOR ON EACH END)
DRIVER INPUT
DRIVER ENABLE
RECEIVER OUTPUT
DE
DI
RO
74HC86
OR EQUIVALENT
MAX487E
MAX1487E
MAX845E
1
2
28
27
3
4
5
6
7
8
9
10
11
12
13
14
26
25
24
23
22
21
20
19
18
17
16
15
TERMINATING RESISTOR
(ONE RESISTOR ON EACH END)
270pF
4kV
Figure 15. Typical Half-Duplex RS-485/RS-422 Network