+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
Pin Description (continued)
MAX3070E
MAX3073E
MAX3076E
MAX3071E
MAX3074E
MAX3077E
PIN
MAX3072E
MAX3075E
MAX3078E
MAX3079E
NAME
FUNCTION
FULL-DUPLEX
DEVICES
HALF-
DUPLEX
DEVICES
FULL- HALF-
DUPLEX DUPLEX
MODE MODE
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
—
—
—
13
13
RXP unconnected for normal transmitter phase/polarity.
Connect to VCC to invert receiver phase/polarity.
14
1
8
14
14
VCC
Positive Supply VCC = 3.3V ±10%. Bypass VCC to GND
with a 0.1µF capacitor.
1, 8, 13
—
—
—
—
N.C. No Connect. Not internally connected. Can be connected
to GND.
*MAX3079E only. In half-duplex mode, the driver outputs serve as receiver inputs. The full-duplex receiver inputs (A and B) still have a
1/8-unit load, but are not connected to the receiver.
MAX3070E/MAX3073E/MAX3076E
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
RE
DE
A, B
0
X
≥ -50mV
0
X
≤ -200mV
0
X
Open/
shorted
1
1
X
1
0
X
OUTPUT
RO
1
0
1
High-Z
Shutdown
Function Tables
MAX3071E/MAX3074E/MAX30767E
INPUT
DI
1
0
TRANSMITTING
OUTPUTS
Z
Y
0
1
1
0
INPUTS
A, B
≥ -50mV
≤ -200mV
Open/shorted
RECEIVING
OUTPUT
RO
1
0
1
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