Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
MAX3080–MAX3089
Pin Description
PIN
PIN
MAX3080 MAX3081 MAX3082
MAX3083 MAX3084 MAX3085
MAX3086 MAX3087 MAX3088
FULL-DUPLEX
DEVICES
MAX3089
NAME
HALF-
DUPLEX
MODE
1
H/F
Half/Full-Duplex Selector Pin. Connect H/F to V
CC
for half-duplex
mode; connect to GND or leave unconnected for full-duplex mode.
Receiver Output. When
RE
is low and if A - B
≥
-50mV, RO will be
high; if A - B
≤
-200mV, RO will be low.
Receiver Output Enable. Drive
RE
low to enable RO; RO is high
impedance when
RE
is high. Drive
RE
high and DE low to enter
low-power shutdown mode.
Driver Output Enable. Drive DE high to enable driver outputs. These
outputs are high impedance when DE is low. Drive
RE
high and DE
low to enter low-power shutdown mode.
Driver Input. With DE high, a low on DI forces noninverting
output low and inverting output high. Similarly, a high on DI
forces noninverting output high and inverting output low.
Slew-Rate-Limit Selector Pin. Connect SRL to GND for 10Mbps
communication rate; connect to V
CC
for 500kbps communication
rate. Leave unconnected for 115kbps communication rate.
Ground
Transmitter Phase. Connect TXP to GND, or leave floating for normal
transmitter phase/polarity. Connect to V
CC
to invert the transmitter
phase/polarity.
Noninverting Driver Output
Noninverting Receiver Input and Noninverting Driver Output*
Inverting Driver Output
Inverting Receiver Input and Inverting Driver Output*
Inverting Receiver Input
Receiver Input Resistors*
Inverting Receiver Input and Inverting Driver Output
FUNCTION
HALF-
FULL-
DUPLEX DUPLEX
DEVICES MODE
—
1
—
—
2
2
1
2
2
RO
3
—
2
3
3
RE
4
—
3
4
4
DE
5
3
4
5
5
DI
—
6, 7
—
9
—
10
—
11
—
—
—
4
—
5
—
6
—
7
—
—
—
5
—
—
—
—
—
—
—
7
6
7
8
9
—
10
—
11
—
—
6
7
8
—
9
—
10
—
11
—
SRL
GND
TXP
Y
Y
Z
Z
B
B
B
10
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
