DS1487 Datasheet, PDF (2/8 Pages) National Semiconductor (TI) – Low Power RS-485 1⁄4 Unit Load Multipoint Transceiver

Absolute Maximum Ratings (Note 2)
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Supply Voltage (V_CC)
Enable Input Voltage
(RE (Note 1), 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
N Package
Storage Temperature Range
Lead Temperature Range
(Soldering, 4 sec.)
ESD (HBM)
0.76W
0.47W
−65˚C to +150˚C
+260˚C
≥2 kV
Recommended Operating
Conditions
Supply Voltage (V_CC)
Operating Free Air
Temperature (T_A)
DS1487
Bus Common Mode Voltage
Min
+4.75
0
−7
Typ Max Units
+5.0 +5.25 V
+25 +70 ˚C
+12 V
Electrical Characteristics
Over Supply Voltage and Operating Temperature Ranges, unless otherwise specified (Notes 3, 4)
Symbol
Parameter
Conditions
Pin
Min Typ Max Units
V_OD1
V_OD2
∆V_OD
Differential Driver Output Voltage
Differential Driver Output Voltage
with Load
Change in Magnitude of Output
Differential Voltage
(No Load)
R_L = 50Ω, (RS422), Figure 1
R_L = 27Ω, (RS485), Figure 1
R_L = 27Ω or 50Ω (Note 5)
A, B
1.5
5V
2 2.8
V
1.5 2.3 5 V
0.2 |V|
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 2
R_L = 27Ω or 50Ω, Figure 1
R_L = 27Ω or 50Ω, Figure 1 (Note 5)
1.5 2.0 5 V
0
3V
0.2 |V|
V_IH
Input High Voltage
V_IL
Input Low Voltage
I_IN1
Input Current
I_IN2
Input Current (Note 6)
DE = 0V, V_CC = 0V or 5.25V
V_TH
Receiver Differential Threshold
Voltage
V_IN = 0V or V_CC
V_IN = +12V
V_IN = −7V
−7V ≤ V_CM ≤ +12V
DI, DE, 2.0
V
RE (Note 1)
0.8 V
±2 µA
A, B
0 190 250 µA
0 −100 −200 µA
−0.2
0.2 V
∆V_TH
V_OH
V_OL
I_OZR
Receiver Input Hysteresis
Receiver Output High Voltage
Receiver Output Low Voltage
TRI-STATE Output Current at
Receiver
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
70
mV
RO
3.5
V
0.5 V
±1 µA
R_IN
Receiver Input Resistance
I_CC
No-Load Supply Current (Note 7)
I_OSD1
Driver Short Circuit Current, V_O =
HIGH
−7V ≤ V_IN ≤ +12V
DE = V_CC, RE (Note 1) = 0V or V_CC
DE = 0V, RE (Note 1) = 0V or V_CC
−7V ≤ V_O ≤ +12V
A, B
V_CC
A, B
48 68
kΩ
200 500 µA
200 500 µA
250 mA
I_OSD2
Driver Short Circuit Current, V_O =
LOW
−7V ≤ V_O ≤ +12V
−250 mA
I_OSR Receiver Short Circuit Current
V_O = GND
RO
7
85 mA
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