Datasheet

Absolute Maximum Ratings (Note 2)
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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
=27Ωor 50Ω (Note 5) 0.2 |V|
Differential Voltage
V
OD3
Differential Driver Output Voltage — R1 = 54Ω, 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
=27Ωor 50Ω, Figure 1 03V
∆V
OC
Change in Magnitude of
Common-Mode Output Voltage
R
L
=27Ωor 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
=0VorV
CC
±
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, V
ID
= 0.2V RO 3.5 V
V
OL
Receiver Output Low Voltage I
O
= 4 mA, V
ID
= −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 kΩ
I
CC
No-Load Supply Current (Note 7) DE = V
CC
, RE (Note 1) = 0V or V
CC
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
DS1487
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