If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage
V
+
V
−
Input Voltage (V
IN
)
Output Voltage
+15V
−15V
−15V
≤
V
IN
≤
7.0V
±
15V
Operating Temperature Range
0˚C to +75˚C
Storage Temperature Range
−65˚C to +150˚C
Maximum Power Dissipation (Note 1) at 25˚C
Molded DIP Package
1280 mW
SO Package
974 mW
Lead Temperature (Soldering, 4
sec.)
260˚C
Note 1:
Derate molded DIP package 10.2 mW/˚C above 25˚C; derate SO
package 7.8 mW/˚C above 25˚C.
Electrical Characteristics
(Notes 3, 4)
V
CC
+ = 9V, V
CC
− = −9V unless otherwise specified
Symbol
I
IL
I
IH
V
OH
V
OL
I
OS
+
I
OS
−
R
OUT
I
CC
+
Parameter
Logical “0” Input Current
Logical “1” Input Current
High Level Output Voltage
Low Level Output Voltage
High Level Output
Short-Circuit Current
Low Level Output
Short-Circuit Current
Output Resistance
Positive Supply Current
(Output Open)
V
+
= V
−
= 0V, V
OUT
=
±
2V
V
IN
= 1.9V
V
+
= 9.0V, V
−
= −9.0V
V
+
= 12V, V
−
= −12V
V
IN
= 0.8V
V = 15V, V = −15V
V
+
= 9.0V, V
−
= −9.0V
V
+
= 12V, V
−
= −12V
V
+
= 15V, V
−
= −15V
V
+
= 9.0V, V
−
= −9.0V
V
+
= 12V, V
−
= −12V
V = 15V, V
−
= −15V
V
+
= 9.0V, V
−
= −9.0V
V = 12V, V = −12V
V
+
= 15V, V
−
= −15V
P
d
Power Dissipation
V = 9.0V, V = −9.0V
V
+
= 12V, V
−
= −12V
+
−
+
−
+
+
−
Conditions
V
IN
= 0V
V
IN
= +5.0V
R
L
= 3.0 kΩ,
V
IN
= 0.8V
R
L
= 3.0 kΩ,
Min
Typ
−0.8
0.005
Max
−1.3
10.0
Units
mA
µA
V
V
V
V
V = 9.0V, V = −9.0V
V
+
= 13.2V, V
−
= −13.2V
V
+
= 9.0V, V
−
= −9.0V
+
−
+
−
6.0
9.0
−6.0
−9.0
−6.0
6.0
300
7.1
10.7
7.0
−10.6
−10.0
10.0
−12.0
12.0
V
IN
= 1.9V
V = 13.2V, V = −13.2V
V
OUT
= 0V, V
IN
= 0.8V
V
OUT
= 0V, V
IN
= 1.9V
mA
mA
Ω
11.6
15.7
19.4
3.4
4.1
9.1
−10.8
−14.6
−18.3
−0.001
−0.001
−0.01
252
444
20.0
25.0
34.0
6.0
7.0
12.0
−17.0
−23.0
−34.0
−0.100
−0.100
−2.5
333
576
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mW
mW
I
CC
−
Negative Supply Current
(Output Open)
V
IN
= 1.9V
V
IN
= 0.8V
Switching Characteristics
(V
CC
= 9V, V
EE
= −9V, T
A
= 25˚C)
Symbol
t
pd1
t
pd0
t
r
t
f
Parameter
Propagation Delay to a Logical “1”
Propagation Delay to a Logical “0”
Rise Time
Fall Time
Conditions
R
L
= 3.0 kΩ, C
L
= 15 pF,
R
L
= 3.0 kΩ, C
L
= 15 pF,
R
L
= 3.0 kΩ, C
L
= 15 pF,
R
L
= 3.0 kΩ, C
L
= 15 pF,
Min
T
A
= 25˚C
T
A
= 25˚C
T
A
= 25˚C
T
A
= 25˚C
Typ
187
45
63
33
Max
350
175
100
75
Units
ns
ns
ns
ns
Note 2:
“Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. Except for “Operating Temperature Range” they
are not meant to imply that the devices should be operated at these limits. The table of “Electrical Characteristics” provides conditions for actual device operation.
Note 3:
Unless otherwise specified min/max limits apply across the 0˚C to +75˚C temperature range for the DS1488.
Note 4:
All currents into device pins shown as positive, out of device pins as negative, all voltages referenced to ground unless otherwise noted. All values shown
as max or min on absolute value basis.
www.national.com
2
Applications
By connecting a capacitor to each driver output the slew
rate can be controlled utilizing the output current limiting
characteristics of the DS1488. For a set slew rate the ap-
propriate capacitor value may be calculated using the fol-
lowing relationship
C = I
SC
(∆T/∆V)
where C is the required capacitor, I
SC
is the short circuit
current value, and
∆V/∆T
is the slew rate.
RS-232C specifies that the output slew rate must not ex-
ceed 30V per microsecond. Using the worst case output
short circuit current of 12 mA in the above equation, calcu-
lations result in a required capacitor of 400 pF connected
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Embedded System
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