Pin description – Rainbow Electronics MAX3079E User Manual
Page 12
MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
12
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Pin Description
PIN
MAX3070E
MAX3073E
MAX3076E
MAX3071E
MAX3074E
MAX3077E
MAX3072E
MAX3075E
MAX3078E
MAX3079E
FULL-DUPLEX
DEVICES
HALF-
DUPLEX
DEVICES
FULL-
DUPLEX
MODE
HALF-
DUPLEX
MODE
NAME
FUNCTION
—
—
—
1
1
H/F
Half-/Full-Duplex Select Pin. Connect H/F to V
CC
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 is high; if (A - B)
≤ -200mV, RO is low.
3
—
2
3
3
RE
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. RE is a hot-swap
input (see the Hot-Swap Capability section for details).
4
—
3
4
4
DE
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. DE is a hot-swap input (see the Hot-
Swap Capability section for details).
5
3
4
5
5
DI
D r i ver Inp ut. W i th D E hi g h, a l ow on D I for ces noni nver ti ng
outp ut l ow and i nver ti ng outp ut hi g h. S i m i l ar l y, a hi g h on D I
for ces noni nver ti ng outp ut hi g h and i nver ti ng outp ut l ow .
—
—
—
6
6
SRL
Slew-Rate Limit Selector Pin. Connect SRL to ground for
16Mbps communication rate; connect to V
CC
for 500kbps
communication rate. Leave unconnected for 250kbps
communication rate.
6, 7
4
5
7
7
GND
Ground
—
—
—
8
8
TXP
Transmitter Phase. Connect TXP to ground or leave
floating for normal transmitter phase/polarity. Connect to
V
CC
to invert the transmitter phase/polarity.
9
5
—
9
—
Y
Noninverting Driver Output
—
—
—
—
9
Y
Noninverting Driver Output and Noninverting Receiver
Input*
10
6
—
10
—
Z
Inverting Driver Output
—
—
—
—
10
Z
Inverting Driver Output and Inverting Receiver Input*
11
7
—
11
—
B
Inverting Receiver Input
—
—
—
—
11
B
Receiver Input Resistors*
—
—
7
—
—
B
Inverting Receiver Input and Inverting Driver Output