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
Four separate receivers per package
n
Programmable threshold
n
Built-in input threshold hysteresis
n
"Fail safe" operating mode: high output for open inputs
n
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
July 2002
DS1489/DS1489A
Quad
Line
Receiver
2002 National Semiconductor Corporation
DS005777
www.national.com
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
10V
Input Voltage Range
30V
Output Load Current
20 mA
Power Dissipation (Note 3)
1W
Operating Temperature Range
0C to +75C
Storage Temperature Range
-65C to
+150C
Maximum Power Dissipation (Note 1) at 25C
Molded DIP Package
1207 mW
SO Package
1042 mW
Lead Temperature (Soldering,
4 sec.)
260C
Note 1: Derate molded DIP package 9.7 mW/C above 25C; derate SO package 8.33 mW/C above 25C.
Electrical Characteristics
(Notes 3, 4, 5)
DS1489/DS1489A: The following apply for V
CC
= 5.0V
1%, 0C
T
A
+75C unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
V
TH
Input High Threshold Voltage
V
OUT
0.45V,
DS1489
T
A
= 25C
1.0
1.25
1.5
V
I
OUT
= 10 mA
0.9
1.6
V
DS1489A
T
A
= 25C
1.75
2.00
2.25
V
1.55
2.40
V
V
TL
Input Low Threshold Voltage
V
OUT
2.5V,
T
A
= 25C
0.75
1.00
1.25
V
I
OUT
= -0.5 mA
0.65
1.35
V
I
IN
Input Current
V
IN
= +25V
+3.6
+5.6
+8.3
mA
V
IN
= -25V
-3.6
-5.6
-8.3
mA
V
IN
= +3V
+0.43
+0.53
mA
V
IN
= -3V
-0.43
-0.53
mA
V
OH
Output High Voltage
I
OUT
= -0.5 mA
V
IN
= 0.75V
2.6
3.8
5.0
V
Input = Open
2.6
3.8
5.0
V
V
OL
Output Low Voltage
V
IN
= 3.0V, I
OUT
= 10 mA
0.33
0.45
V
I
SC
Output Short Circuit Current
V
IN
= 0.75V
-3.0
mA
I
CC
Supply Current
V
IN
= 5.0V
14
26
mA
P
d
Power Dissipation
V
IN
= 5.0V
70
130
mW
Switching Characteristics
V
CC
= 5V, T
A
= 25C
Symbol
Parameter
Conditions
Min
Typ
Max
Units
t
pd1
Input to Output "High"
R
L
= 3.9k, (Figure 1) (AC Test Circuit)
28
85
ns
Propagation Delay
t
pd0
Input to Output "Low"
R
L
= 390
, (Figure 1) (AC Test Circuit)
20
50
ns
Propagation Delay
t
r
Output Rise Time
R
L
= 3.9k, (Figure 1) (AC Test Circuit)
110
175
ns
t
f
Output Fall Time
R
L
= 390
, (Figure 1) (AC Test Circuit)
9
20
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 0C to +75C 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.
DS1489/DS1489A
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3
Typical Characteristics
V
CC
= 5.0V, T
A
= +25C unless otherwise noted
00577707
FIGURE 2. Input Current
00577708
FIGURE 3. DS1489 Input Threshold Voltage Adjustment
00577709
FIGURE 4. DS1489A Input Threshold Voltage
Adjustment
00577710
FIGURE 5. Input Threshold Voltage vs Temperature
00577711
FIGURE 6. Input Threshold vs Power Supply Voltage
00577712
FIGURE 7. Noise Rejection vs Capacitance for
DS1489A
DS1489/DS1489A
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4
Typical Application Information
00577705
*Optional for noise filtering.
Applications Using the Response Control Pin
Noise Filter
See Figure 7
Threshold Shift
See Figures 3, 4
Noise Filter and Threshold Shift
See Figures 3, 4, 7
00577713
00577714
00577715
Application of DS1488, DS1489A and UART
00577716
DS1489/DS1489A
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5
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