±15kV ESD-Protected, Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
MAX3080E–MAX3089E
Pin Description
PIN
MAX3080E MAX3081E MAX3082E
MAX3083E MAX3084E MAX3085E
MAX3086E MAX3087E MAX3088E
FULL-DUPLEX
DEVICES
HALF-
DUPLEX
DEVICES
—
MAX3089E
NAME
FULL-
DUPLEX
MODE
1
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 out-
puts. 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 non-inverting 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
—
—
2
2
1
2
2
RO
3
—
2
3
3
RE
4
—
3
4
4
DE
5
3
4
5
5
DI
—
—
—
6
6
SRL
6, 7
—
9
—
10
—
11
—
—
4
—
5
—
6
—
7
—
—
5
—
—
—
—
—
—
—
7
7
8
9
—
10
—
11
—
—
7
8
—
9
—
10
—
11
—
GND
TXP
Y
Y
Z
Z
B
B
B
10
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
