Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
MAX3080–MAX3089
Pin Description (continued)
PIN
MAX3080 MAX3081 MAX3082
MAX3083 MAX3084 MAX3085
MAX3086 MAX3087 MAX3088
FULL-DUPLEX
DEVICES
12
—
—
—
14
1, 8, 13
8
—
—
—
1
—
MAX3089
NAME
HALF-
DUPLEX
MODE
—
12
—
13
14
—
A
A
A
RXP
V
CC
N.C.
Noninverting Receiver Input
Receiver Input Resistors*
Noninverting Receiver Input and Noninverting Driver Output
Receiver Phase. Connect RXP to GND, or leave unconnected for
normal transmitter phase/polarity. Connect to V
CC
to invert the
receiver phase/polarity.
Positive Supply; 4.75V
≤
V
CC
≤
5.25V
Not Connected. Not internally connected.
FUNCTION
HALF-
FULL-
DUPLEX DUPLEX
DEVICES MODE
—
—
6
—
8
—
12
—
—
13
14
—
*(MAX3089
only.) In half-duplex mode, the driver outputs serve as receiver inputs. The full-duplex receiver inputs (A and B) will still
have a 1/8-unit load, but are not connected to the receiver.
Function Tables
MAX3080/MAX3083/MAX3086
TRANSMITTING
INPUTS
RE
X
X
0
1
DE
1
1
0
0
DI
1
0
X
X
Z
0
1
High-Z
Shutdown
RECEIVING
INPUTS
RECEIVING
INPUTS
RE
0
0
0
1
1
DE
X
X
X
1
0
A-B
≥
-0.05V
≤
-0.2V
Open/shorted
X
X
OUTPUT
RO
1
0
1
High-Z
Shutdown
A-B
≥
-0.05V
≤
-0.2V
Open/shorted
OUTPUT
RO
1
0
1
OUTPUTS
Y
1
0
High-Z
INPUT
DI
1
0
Z
0
1
MAX3081/MAX3084/MAX3087
TRANSMITTING
OUTPUTS
Y
1
0
X = Don’t care
Shutdown mode, driver and receiver outputs high impedance
______________________________________________________________________________________
11
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
