Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
Pin Description
PPIINN
MAX3080 MAX3081 MAX3082
MAX3083 MAX3084 MAX3085
MAX3086 MAX3087 MAX3088
MAX3089
NAME
FUNCTION
FULL-DUPLEX
DEVICES
HALF- FULL- HALF-
DUPLEX DUPLEX DUPLEX
DEVICES MODE MODE
—
—
—
1
1
H/F
Half/Full-Duplex Selector Pin. Connect H/F to VCC for half-duplex
mode; connect to GND or leave unconnected for full-duplex mode.
2
2
1
2
2
RO
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
3
—
2
3
3
RE 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
4
—
3
4
4
DE 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
5
3
4
5
5
DI output low and inverting output high. Similarly, a high on DI
forces noninverting output high and inverting output low.
—
—
—
6
6, 7
4
5
7
Slew-Rate-Limit Selector Pin. Connect SRL to GND for 10Mbps
6
SRL communication rate; connect to VCC for 500kbps communication
rate. Leave unconnected for 115kbps communication rate.
7
GND Ground
—
—
—
8
Transmitter Phase. Connect TXP to GND, or leave floating for normal
8
TXP transmitter phase/polarity. Connect to VCC to invert the transmitter
phase/polarity.
9
5
—
9
—
Y Noninverting Driver Output
—
—
—
—
9
Y Noninverting Receiver Input and Noninverting Driver Output*
10
6
—
10
—
Z Inverting Driver Output
—
—
—
—
10
Z Inverting Receiver Input and Inverting Driver Output*
11
7
—
11
—
B Inverting Receiver Input
—
—
—
—
11
B Receiver Input Resistors*
—
—
7
—
—
B Inverting Receiver Input and Inverting Driver Output
10 ______________________________________________________________________________________