Rs485 Interface - MTX -4G-JAVA-IoT Hardware User's Manual

1.3 RS485 interface

ABSOLUTE MAXIMUM RATINGS
Symbol Parameter
Voltage input range, transient
V
I
pulse, A & B, through 100 Ω
I Receiver output current
o
Electrostatic discharge
CHARACTERISTICS
Sym Parameter
Driver differential
|V |
OD
output voltage
Driver differential
C(
OD)
output capacitance
Driver short-circuit
I
OS
output current
Receiver positive-going
V
IT+
input threshold voltage
Receiver negative-going
V
IT-
input threshold voltage
Receiver input
V
hys
hysteresis (VIT+ - VIT-)
Receiver differential
C(
ID)
input capacitance
MTX-Java-IoT | 2018/2
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Conditions
Human body model
Charged-device model
Conditions
I
=0
O
R =54kΩ
L
V
OD
=0.4sin(4Eπt)+0.5V
I =-8mA
O
I =8mA
O
V
OD
=0.4sin(4Eπt)+0.5V
Min Max
±50
±11
±16
±1
Min Typ Max
2 3
-5 -5.4
16
250
-0.065 -0.01
-0.2 -0.1
35
15
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Unit
V
mA
kV
kV
Ut
V
V
pF
mA
V
V
mV
pF
45