Pin description, Function tables, Table 1. transmitting – Rainbow Electronics MAX3430 User Manual
Page 8: Table 2. receiving
MAX3430
±80V Fault-Protected, Fail-Safe,
1/4-Unit Load, +3.3V RS-485 Transceiver
8
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Pin Description
PIN
NAME
FUNCTION
1
RO
Receiver Output
2
RE
Receiver Output Enable. RO is enabled when RE is low; RO is high impedance when RE is high. The
device enters a low-power shutdown mode if RE is high and DE is low.
3
DE
Driver Output Enable. Driving DE high enables the driver outputs. Pulling DE low puts the driver
outputs in a high-impedance state. If RE is high and DE is low, the device enters a low-power
shutdown mode. If the driver outputs are enabled, the device functions as a line driver, and when
they are high impedance it functions as a line receiver if RE is low.
4
DI
Driver Input. A logic low on DI forces output A low and output B high, while a logic high on DI forces
output A high and output B low.
5
GND
Ground
6
A
Noninverting Receiver Input/Driver Output
7
B
Inverting Receiver Input/Driver Output
8
V
CC
Positive Supply, V
CC
= +3.3V ±10%. Bypass V
CC
to GND with a 0.1µF ceramic capacitor.
Function Tables
Table 1. Transmitting
INPUTS
OUTPUTS
RE
DE
DI
B
A
MODE
X
1
1
0
1
Normal
X
1
0
1
0
Normal
0
0
X
High-Z
High-Z
Normal
1
0
X
High-Z
High-Z
Shutdown
Table 2. Receiving
INPUTS
OUTPUTS
RE
DE
(A - B)
RO
MODE
0
0
≥ -50mV
1
Normal
0
0
≤ -200mV
0
Normal
0
0
Inputs
open
1
Normal
1
0
X
High-Z
Shutdown
X = Don’t care.
X = Don’t care.