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DS1488
Quad Line Driver
General Description
The DS1488 is a quad line driver which converts standard
TTL input logic levels through one stage of inversion to output levels which meet EIA Standard RS-232D and CCITT
Recommendation V.24.
Features
n Current limited output:±10 mA typ
n Power-off source impedance: 300Ω min
n Simple slew rate control with external capacitor
n Flexible operating supply range
n Inputs are TTL/LS compatible
Schematic and Connection Diagrams
1/4 Circuit
DS005776-1
Dual-In-Line Package
DS005776-2
Top View
Order Number DS1488M or DS1488N
See NS Package Number M14A or N14A
July 1999
DS1488 Quad Line Driver
© 1999 National Semiconductor Corporation DS005776 www.national.com
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Absolute Maximum Ratings (Note 2)
If Military/Aerospace specified devices are required,
please contact theNational Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage
V
+
+15V
V
−
−15V
Input Voltage (V
IN
) −15V ≤ VIN≤
7.0V
Output Voltage
±
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)
VCC+=9V, VCC−=−9V unless otherwise specified
Symbol Parameter Conditions Min Typ Max Units
I
IL
Logical “0” Input Current V
IN
=
0V −0.8 −1.3 mA
I
IH
Logical “1” Input Current V
IN
=
+5.0V 0.005 10.0 µA
V
OH
High Level Output Voltage R
L
=
3.0 kΩ,V
+
=
9.0V, V
−
=
−9.0V 6.0 7.1 V
V
IN
=
0.8V V
+
=
13.2V, V
−
=
−13.2V 9.0 10.7 V
V
OL
Low Level Output Voltage R
L
=
3.0 kΩ,V
+
=
9.0V, V
−
=
−9.0V −6.0 7.0 V
V
IN
=
1.9V V
+
=
13.2V, V
−
=
−13.2V −9.0 −10.6 V
I
OS
+ High Level Output V
OUT
=
0V, V
IN
=
0.8V −6.0 −10.0 −12.0 mA
Short-Circuit Current
I
OS
− Low Level Output V
OUT
=
0V, V
IN
=
1.9V 6.0 10.0 12.0 mA
Short-Circuit Current
R
OUT
Output Resistance V
+
=
V
−
=
0V, V
OUT
=
±
2V 300 Ω
I
CC
+ Positive Supply Current V
IN
=
1.9V V
+
=
9.0V, V
−
=
−9.0V 11.6 20.0 mA
(Output Open) V
+
=
12V, V
−
=
−12V 15.7 25.0 mA
V
+
=
15V, V
−
=
−15V 19.4 34.0 mA
V
IN
=
0.8V V
+
=
9.0V, V
−
=
−9.0V 3.4 6.0 mA
V
+
=
12V, V
−
=
−12V 4.1 7.0 mA
V
+
=
15V, V
−
=
−15V 9.1 12.0 mA
I
CC
− Negative Supply Current V
IN
=
1.9V V
+
=
9.0V, V
−
=
−9.0V −10.8 −17.0 mA
(Output Open) V
+
=
12V, V
−
=
−12V −14.6 −23.0 mA
V
+
=
15V, V
−
=
−15V −18.3 −34.0 mA
V
IN
=
0.8V V
+
=
9.0V, V
−
=
−9.0V −0.001 −0.100 mA
V
+
=
12V, V
−
=
−12V −0.001 −0.100 mA
V
+
=
15V, V
−
=
−15V −0.01 −2.5 mA
P
d
Power Dissipation V
+
=
9.0V, V
−
=
−9.0V 252 333 mW
V
+
=
12V, V
−
=
−12V 444 576 mW
Switching Characteristics
(V
CC
=
9V, V
EE
=
−9V, T
A
=
25˚C)
Symbol Parameter Conditions Min Typ Max Units
t
pd1
Propagation Delay to a Logical “1” R
L
=
3.0 kΩ,C
L
=
15 pF, T
A
=
25˚C 187 350 ns
t
pd0
Propagation Delay to a Logical “0” R
L
=
3.0 kΩ,C
L
=
15 pF, T
A
=
25˚C 45 175 ns
t
r
Rise Time R
L
=
3.0 kΩ,C
L
=
15 pF, T
A
=
25˚C 63 100 ns
t
f
Fall Time R
L
=
3.0 kΩ,C
L
=
15 pF, T
A
=
25˚C 33 75 ns
Note 2: “AbsoluteMaximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. Except for “Operating TemperatureRange” 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.
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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 appropriate capacitor value may be calculated using the following 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 exceed 30V per microsecond. Using the worst case output
short circuit current of 12 mA in the above equation, calculations result in a required capacitor of 400 pF connected
to each output.
See Typical Performance Characteristics.
Typical Applications
RS-232C Data Transmission
DS005776-3
Note 5: Optional for noise filtering
DTL/TTL-to-MOS Translator
DS005776-4
DTL/TTL-to-HTL Translator
DS005776-5
DTL/TTL-to-RTL Translator
DS005776-6
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AC Load Circuit and Switching Time Waveforms
Typical Performance Characteristics
T
A
=
+25˚C unless otherwise noted
DS005776-7
*
CLincludes probe and jig capacitance.
DS005776-8
trand tfare measured between 10
%
and 90%of the output waveform.
DS005776-9
FIGURE 1. Transfer Characteristics
vs Power Supply Voltage
DS005776-10
FIGURE 2. Short-Circuit Output
Current vs Temperature
DS005776-11
FIGURE 3. Output Slew Rate vs
Load Capacitance
DS005776-12
FIGURE 4. Output Voltage and
Current-Limiting Characteristics
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Physical Dimensions inches (millimeters) unless otherwise noted
SO Package (M)
Order Number DS1488M
NS Package Number M14A
Molded Dual-In-Line Package (N)
Order Number DS1488N
NS Package Number N14A
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Notes
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
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Corporation
Americas
Tel: 1-800-272-9959
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Tel: 81-3-5639-7560
Fax: 81-3-5639-7507
www.national.com
DS1488 Quad Line Driver
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
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