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