Specifications

Appendix A - EIA Specification Summary RS-422 And RS-485 Applications Ebook
Page 86 of 137 Manual Documentation Number: <DocNumber>
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EIA-485 Specifications
EIA RS-485 Specification Summary
Parameter
Conditions
Min
Max
Units
Driver Output Voltage Open Circuit
1.5
-1.5
6
-6
V
V
Driver Output Voltage Loaded
RLOAD = 54 ohms
1.5
-1.5
5
-5
V
V
Driver Output Short-Circuit Current
Per output to +12V
or –7V
±250
mA
Driver Output Rise Time
RLOAD = 54 ohms
CLOAD = 50 pF
30
% of Bit Width
Driver Common Mode Voltage
RLOAD = 54 ohms
-1
3
V
Receiver Sensitivity
Vcm = -7 to +12v
±200
mV
Receiver Common-Mode Voltage Range
-7
+12
V
Receiver Input Resistance
12K
ohms
EIA-232 Specifications
EIA RS-232 Specification Summary
Parameter
Conditions
Min
Max
Units
Driver Output Voltage Open Circuit
25
V
Driver Output Voltage Loaded
RL = 3 kohm to 7
kohm
5
15
V
Driver Output Resistance, Power Off
Vo = -2V to 2V
300
ohm
Driver Output Short-Circuit Current
500
mA
Driver Output Slew Rate
30
V/us
Maximum Load Capacitance
2500
pF
Receiver Input Resistance
Vin = 3V to 25V
3000
7000
ohm
Receiver Input Threshold
Output = Mark
Output = Space
-3
3
V
V