±15kV ESD-Protected, Slew-Rate-Limited,
Low-Power, RS-485/RS-422 Transceivers
______________________________________________________________Pin Description
PIN
MAX481E/MAX483E
MAX485E/MAX487E
MAX1487E
NAME
FUNCTION
MAX481E/MAX483E/MAX485E/MAX487E–MAX491E/MAX1487E
MAX481E/MAX483E/MAX485E/MAX487E–MAX491E/MAX1487E
MAX488E
MAX490E
MAX489E
MAX491E
1
2
2
—
2
3
RO
––
—
RE
Receiver Output: If A > B by 200mV, RO will be high;
If A < B by 200mV, RO will be low.
––
—
Receiver Output Enable. RO is enabled when RE is
––
—
low; RO is high impedance when RE is high.
Driver Output Enable. The driver outputs, Y and Z, are
enabled by bringing DE high. They are high imped-
ance when DE is low. If the driver outputs are enabled,
the parts function as line drivers. While they are high
– –
—
impedance, they function as line receivers if R E is low.
Driver Input. A low on DI forces output Y low and out-
put Z high. Similarly, a high on DI forces output Y high
and output Z low.
Ground
Noninverting Driver Output
Inverting Driver Output
Noninverting Receiver Input and Noninverting Driver
Output
Noninverting Receiver Input
Inverting Receiver Input and Inverting Driver Output
Inverting Receiver Input
Positive Supply: 4.75V
≤
V
CC
≤
5.25V
No Connect—not internally connected
3
—
4
DE
4
5
—
—
6
—
7
—
8
—
3
4
5
6
—
8
—
7
1
—
5
6, 7
9
10
—
12
—
11
14
1, 8, 13
DI
GND
Y
Z
A
A
B
B
V
CC
N.C.
_______________________________________________________________________________________
7
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
