MTX MTX-3G-JAVA-IoT - 3.1.3 RS485 Interface; 3.1.4 Counter Input

MTX-xG-JAVA-IoT Family
www.mtxm2m.com 2017/07 v1.2 Page 40/105
MTX M2M® by MATRIX ELECTRONICA S.L.U
3.1.3 RS485 interface
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Conditions
Min.
Max.
Unit
V
I
Voltage input range,
transient pulse, A and B,
through 100 Ω
±50
V
I
O
Receiver output current
±11
mA
Electrostatic discharge
Human body model
±16
kV
Chraged-device model
±1
kV
CHARACTERISTICS
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Unit
|V
OD
|
Driver differential output voltage
I
O
=0
2
3
V
R
L
=54kΩ
-5
-5.4
V
C
(OD)
Driver differential output
capacitance
V
OD
=0.4sin(4Eπt)+0.5V
16
pF
I
OS
Driver short-circuit output current
-250
+250
mA
V
IT+
Receiver positive-going input
threshold voltage
I
O
=-8mA
-0.065
-0.01
V
V
IT-
Receiver negative-going input
threshold voltage
I
O
=8mA
-0.2
-0.1
V
V
hys
Receiver input hysteresis (V
IT+
- V
IT-
)
35
mV
C
(ID)
Receiver differential input
capacitance
V
OD
=0.4sin(4Eπt)+0.5V
15
pF
3.1.4 Counter input
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Conditions
Min.
Max.
Unit
V
I
Input voltage range
-12
40
V
CHARACTERISTICS
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Unit
V
IH
High-level input voltage
2.0
V
V
IL
Low-level input voltage
0.9
V