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DS1489/DS1489A Quad Line Receiver
July 2002
DS1489/DS1489A
Quad Line Receiver
General Description
The DS1489/DS1489A are quad line receivers designed to
interface data terminal equipment with data communications
equipment. They are constructed on a single monolithic
silicon chip. These devices satisfy the specifications of EIA
Standard RS-232D. The DS1489/DS1489A meet and ex-
ceed the specifications of MC1489/MC1489A and are
pin-for-pin replacements.
Features
n
n
n
n
n
Four separate receivers per package
Programmable threshold
Built-in input threshold hysteresis
“Fail safe” operating mode: high output for open inputs
Inputs withstand
±
30V
Schematic and Connection Diagrams
00577701
(
1
⁄
4
of unit shown)
DS1489: R
F
= 10k
DS1489A: R
F
= 2k
Dual-In-Line or Small-Out Line Package
00577702
Top View
Order Number DS1489M, DS1489MX, DS1489N, DS1489AM, DS1489AMX or DS1489AN
See NS Package Number M14A or N14A
© 2002 National Semiconductor Corporation
DS005777
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DS1489/DS1489A
AC Test Circuit and Voltage Waveforms
00577703
00577704
FIGURE 1.
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2
DS1489/DS1489A
Absolute Maximum Ratings
(Note 2)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Power Supply Voltage
Input Voltage Range
Output Load Current
Power Dissipation (Note 3)
Operating Temperature Range
Storage Temperature Range
10V
Maximum Power Dissipation (Note 1) at 25˚C
Molded DIP Package
SO Package
Lead Temperature (Soldering,
4 sec.)
1207 mW
1042 mW
260˚C
±
30V
20 mA
1W
0˚C to +75˚C
−65˚C to
+150˚C
Note 1:
Derate molded DIP package 9.7 mW/˚C above 25˚C; derate SO package 8.33 mW/˚C above 25˚C.
Electrical Characteristics
(Notes 3, 4, 5)
DS1489/DS1489A: The following apply for V
CC
= 5.0V
±
1%, 0˚C
≤
T
A
≤
+75˚C unless otherwise specified.
Symbol
V
TH
Parameter
Input High Threshold Voltage
V
OUT
≤
0.45V,
I
OUT
= 10 mA
DS1489A
V
TL
I
IN
Input Low Threshold Voltage
Input Current
V
OUT
≥
2.5V,
I
OUT
= −0.5 mA
V
IN
= +25V
V
IN
= −25V
V
IN
= +3V
V
IN
= −3V
V
OH
V
OL
I
SC
I
CC
P
d
Output High Voltage
Output Low Voltage
Output Short Circuit Current
Supply Current
Power Dissipation
I
OUT
= −0.5 mA
V
IN
= 0.75V
Input = Open
V
IN
= 3.0V, I
OUT
= 10 mA
V
IN
= 0.75V
V
IN
= 5.0V
V
IN
= 5.0V
T
A
= 25˚C
T
A
= 25˚C
Conditions
DS1489
T
A
= 25˚C
Min
1.0
0.9
1.75
1.55
0.75
0.65
+3.6
−3.6
+0.43
−0.43
2.6
2.6
+5.6
−5.6
+0.53
−0.53
3.8
3.8
0.33
−3.0
14
70
26
130
5.0
5.0
0.45
1.00
2.00
Typ
1.25
Max
1.5
1.6
2.25
2.40
1.25
1.35
+8.3
−8.3
Units
V
V
V
V
V
V
mA
mA
mA
mA
V
V
V
mA
mA
mW
Switching Characteristics
V
CC
= 5V, T
A
= 25˚C
Symbol
t
pd1
t
pd0
t
r
t
f
Parameter
Input to Output “High”
Propagation Delay
Input to Output “Low”
Propagation Delay
Output Rise Time
Output Fall Time
R
L
= 3.9k, (Figure
1)
(AC Test Circuit)
R
L
= 390Ω, (Figure
1)
(AC Test Circuit)
110
9
175
20
ns
ns
R
L
= 390Ω, (Figure
1)
(AC Test Circuit)
20
50
ns
Conditions
R
L
= 3.9k, (Figure
1)
(AC Test Circuit)
Min
Typ
28
Max
85
Units
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 DS1489 and DS1489A.
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.
Note 5:
These specifications apply for response control pin = open.
3
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DS1489/DS1489A
Typical Characteristics
V
CC
= 5.0V, T
A
= +25˚C unless otherwise noted
00577707
00577710
FIGURE 2. Input Current
FIGURE 5. Input Threshold Voltage vs Temperature
00577708
00577711
FIGURE 3. DS1489 Input Threshold Voltage Adjustment
FIGURE 6. Input Threshold vs Power Supply Voltage
00577709
00577712
FIGURE 4. DS1489A Input Threshold Voltage
Adjustment
FIGURE 7. Noise Rejection vs Capacitance for
DS1489A
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