DS485 Datasheet, PDF (2/10 Pages) National Semiconductor (TI) – Low Power RS-485/RS-422 Multipoint Transceiver

Absolute Maximum Ratings (Note 1)
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Supply Voltage (V_CC)
Enable Input Voltage (RE*, DE)
Driver Input Voltage (DI)
Driver Output Voltage (A, B)
+12V
−0.5V to (V_CC + 0.5V)
−0.5V to (V_CC + 0.5V)
−14V to +14V
Receiver Input Voltage (A, B)
−14V to +14V
Receiver Output Voltage (RO)
−0.5V to (V_CC + 0.5V)
Maximum Package Power Dissipation @ +25˚C
M Package
1.19W
N Package
0.74W
Derate M Package 9.5 mW/˚C above +25˚C
Derate N Package 6.0 mW/˚C above +25˚C
Maximum Package Power Dissipation @ +70˚C
M Package
0.76W
N Package
Storage Temperature Range
Lead Temperature Range
(Soldering, 4 sec.)
ESD (HBM)
0.47W
−65˚C to +150˚C
+260˚C
≥2 kV
Recommended Operating
Conditions
Supply Voltage (V_CC)
Operating Free Air
Temperature (T_A)
DS485
DS485T
Bus Common Mode Voltage
Min
+4.75
0
−40
−7
Typ
+5.0
+25
+25
Max Units
+5.25 V
+70 ˚C
+85 ˚C
+12 V
Electrical Characteristics
Over Supply Voltage and Operating Temperature Ranges, unless otherwise specified (Notes 2, 3)
Symbol
Parameter
Conditions
Pin
V_OD1
Differential Driver Output Voltage
(No Load)
A, B
V_OD2
Differential Driver Output Voltage
R_L = 50Ω, (RS422), Figure 1
with Load
R_L = 27Ω, (RS485), Figure 1
∆V_OD Change in Magnitude of Output
R_L = 27Ω or 50Ω (Note 4)
Differential Voltage
V_OD3
V_OC
∆V_OC
Differential Driver Output Voltage —
Full Load with Max V_CM
Driver Common-Mode Output Voltage
Change in Magnitude of Common-Mode
Output Voltage
R1 = 54Ω, R2 = 375Ω
V_TEST = −7V to +12V, Figure 5
R_L = 27Ω or 50Ω, Figure 1
R_L = 27Ω or 50Ω, Figure 1 (Note 4)
V_IH
V_IL
I_IN1
I_IN2
V_TH
∆V_TH
V_OH
V_OL
I_OZR
R_IN
I_CC
I_OSD1
I_OSD2
I_OSR
Input High Voltage
Input Low Voltage
Input Current
Input Current (Note 5)
DE = 0V, V_CC = 0V or 5.25V
Receiver Differential Threshold Voltage
Receiver Input Hysteresis
Receiver Output High Voltage
Receiver Output Low Voltage
TRI-STATE Output Current at Receiver
Receiver Input Resistance
No-Load Supply Current (Note 6)
Driver Short Circuit Current, V_O = HIGH
Driver Short Circuit Current, V_O = LOW
Receiver Short Circuit Current
V_IN = 0V or V_CC
V_IN = +12V
V_IN = −7V
−7V ≤ V_CM ≤ +12V
V_CM = 0V
I_O = −4 mA, V_ID = 0.2V
I_O = 4 mA, V_ID = −0.2V
0.4V ≤ V_O ≤ 2.4V
−7V ≤ V_IN ≤ +12V
DE = V_CC, RE* = 0V or V_CC
DE = 0V, RE* = 0V or V_CC
−7V ≤ V_O ≤ +12V
−7V ≤ V_O ≤ +12V
0V ≤ V_O ≤ V_CC
DI,
DE,
RE*
A, B
RO
A, B
V_CC
A, B
RO
Min Typ
2 2.8
1.5 2.3
1.5 2.0
2.0
−0.2
70
3.5
12
200
200
35
35
7
Max
5
5
0.2
5
3
0.2
0.8
±2
1.0
−0.8
0.2
0.4
±1
900
500
250
250
85
Units
V
V
V
|V|
V
V
|V|
V
V
µA
mA
mA
V
mV
V
V
µA
kΩ
µA
µA
mA
mA
mA
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