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DS1487 Datasheet(PDF) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. DS1487
Description  Low Power RS-485 1⁄4 Unit Load Multipoint Transceiver
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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DS1487 Datasheet(HTML) 2 Page - National Semiconductor (TI)

   
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Absolute Maximum Ratings (Note 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (V
CC)
+12V
Enable Input Voltage
(RE (Note 1), DE)
−0.5V to (V
CC + 0.5V)
Driver Input Voltage (DI)
−0.5V to (V
CC + 0.5V)
Driver Output Voltage (A, B)
−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
0.47W
Storage Temperature Range
−65˚C to +150˚C
Lead Temperature Range
(Soldering, 4 sec.)
+260˚C
ESD (HBM)
≥2kV
Recommended Operating
Conditions
Min
Typ
Max
Units
Supply Voltage (V
CC)
+4.75
+5.0
+5.25
V
Operating Free Air
Temperature (T
A)
DS1487
0
+25
+70
˚C
Bus Common Mode Voltage
−7
+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
Differential Driver Output Voltage
(No Load)
A, B
1.5
5
V
V
OD2
Differential Driver Output Voltage
R
L = 50Ω, (RS422), Figure 1
2
2.8
V
with Load
R
L = 27Ω, (RS485), Figure 1
1.5
2.3
5
V
∆V
OD
Change in Magnitude of Output
R
L = 27Ω or 50Ω (Note 5)
0.2
|V|
Differential Voltage
V
OD3
Differential Driver Output Voltage —
R1 = 54
Ω,R2 = 375Ω
1.5
2.0
5
V
Full Load with Max V
CM
V
TEST = −7V to +12V, Figure 2
V
OC
Driver Common-Mode Output Voltage
R
L = 27Ω or 50Ω, Figure 1
03
V
∆V
OC
Change in Magnitude of
Common-Mode Output Voltage
R
L = 27Ω or 50Ω, Figure 1 (Note 5)
0.2
|V|
V
IH
Input High Voltage
DI, DE,
2.0
V
V
IL
Input Low Voltage
RE (Note 1)
0.8
V
I
IN1
Input Current
V
IN = 0V or VCC
±2µA
I
IN2
Input Current (Note 6)
V
IN = +12V
A, B
0
190
250
µA
DE = 0V, V
CC = 0V or 5.25V
V
IN = −7V
0
−100 −200
µA
V
TH
Receiver Differential Threshold
Voltage
−7V
≤ V
CM ≤ +12V
−0.2
0.2
V
∆V
TH
Receiver Input Hysteresis
V
CM = 0V
70
mV
V
OH
Receiver Output High Voltage
I
O = −4 mA, VID = 0.2V
RO
3.5
V
V
OL
Receiver Output Low Voltage
I
O = 4 mA, VID = −0.2V
0.5
V
I
OZR
TRI-STATE Output Current at
Receiver
0.4V
≤ V
O ≤ 2.4V
±1µA
R
IN
Receiver Input Resistance
−7V
≤ V
IN ≤ +12V
A, B
48
68
k
I
CC
No-Load Supply Current (Note 7)
DE = V
CC, RE (Note 1) = 0V or VCC
V
CC
200
500
µA
DE = 0V, RE (Note 1) = 0V or V
CC
200
500
µA
I
OSD1
Driver Short Circuit Current, V
O =
HIGH
−7V
≤ V
O ≤ +12V
A, B
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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