April 2006 Rev 4 1/
17
MC1489
MC1489A
Quad line receivers
General features
■Input resistance –3k to 7kΩ
■Input signal range ± 30V
■Input threshold hysteresis built-in
■Response control:
a) Logic threshold shifting
b) Input noise filtering
Description
The MC1489 monolithic quad line receivers are
designed to interface data terminal equipment
with data communications equipment in
confo rmanc e with the sp eci f ica tions of EIA
Standard N° RS232C.
SOP
DIP
www.st.com
Order code
Part Number
DIP14 SO14 (Tape & reel)
MC1489P MC1489D1013TR
MC1489AP MC1488AD1013TR
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Contents MC1489/MC1489A
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Contents
1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6 Typical applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
8 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
8.1 Device characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
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MC1489/MC1489A Diagram
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1 Diagram
Figure 1. Schematic diagram
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Pin descrip tio n MC1489/MC1489A
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2 Pin description
Figure 2. Pin connections
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MC1489/MC1489A Maximum ratings
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3 Maximum rating s
Note: Absolute Maximum Ratings are those values beyond which damage to the device may
occur. Functional operation under these condition is not implied.
Table 1. Absolute maximum ratings
Symbol Parameter Value Unit
VSPower supply voltage 10 V
VIInput voltage range ±30 V
IOL Output load current 20 mA
PTOT Power dissipation 1 W
Tamb Operating ambient temperature 0 to 75 °C
Tstg St orag e temp era ture rang e -65 to 150 °C
Table 2. Thermal data
Symbol Parameter Plastic DIP14 SO14 Unit
RthJA Thermal resistance junction-ambient Max 200 165 °C/W
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Electrical characteristics MC1489/MC1489A
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4 Electrical characteristics
Table 3. Electrical characteristics (Response control pin in open; VS = 5V, Tamb = 0 to 75°C, unless
otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
IIH Positive input current VIH = 25 V 3.6 8.3 mA
VIH = 3 V 0.43
IIL Negative input current VIL = - 25 V -3.6 -8.3 mA
VIL = - 3 V -0.43
VIH Input turn-on threshold
voltage
Tamb = 25°C,
VOL ≤ 0.45 V
IL = 10 mA
for MC1489 1 1.5 V
for MC1489A 1.75 1.95 2.25
VIL Input turn-off threshold
voltage Tamb = 25°C, VOL ≥ 2.5 V IL = -0.5 mA 0.75 1.25 V
VOH Output vol t age high VIH = 0.75 V, IL = -0.5 mA 2.5 4 5 V
IL = 0.5 mA Input Open Circuit 2.5 4 5
VOL Output vol t age low VIL = 3 V, IL = 10 mA 0.2 0.45 V
IOS Output sho rt circuit
current -3 -4 mA
ISPower supply current All gates "ON", IO = 0 mA, VIH = 5 V 16 26 mA
PCPower consumption VIH = 5 V 80 130 mW
Table 4. Switching characteristics (VS = 5V, Tamb = 25°C)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
tPLH Prop ag ati on del ay time RL = 3.9 K Ω25 85 ns
tTHL Rise time RL = 3.9 KΩ120 175 ns
tPHL Propag ati on del ay time RL = 390 Ω25 50 ns
tTHL Fall time RL = 390 Ω10 20 ns
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MC1489/MC1489A Test circuit
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5 Test circuit
Figure 3. Switching response
Figure 4. Response control node
Figure 5. Input current
C: capacitor is for noise filtering
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Test circuit MC1489/MC1489A
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Figure 6. Output short-circuit current
Figure 7. Output voltage and input threshold voltage
Figure 8. Power supply currents
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MC1489/MC1 489A Typical ap plica tions
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6 Typical applications
Figure 9. RS232C Data transmission
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Typical characteristics MC1489/MC1489A
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7 Typical characteristics
(VS = 5V, Tamb = 25°C)
Figure 10. Input current vs input voltage
Figure 11. MC1489 Input threshold voltage
adjustment
Figure 12. MC1489A Input threshold voltage
adjustment Figure 13. Input threshold vs temperature
Figure 14. Input threshold vs power supply
voltage
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MC1489/MC1489A Application information
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8 Application information
The Electronic Industries Association (EIA) has released the RS-232C specification
detailing the requirements for the interface between data processing equipment and data
communications equipment. This standard specifies not only the number and type of
interface leads, but also the voltage levels to be used. The MC1488 quad driver and its
companion circuit, the MC1489 quad receiver , provide a complete interface system between
DTL or TTL logic levels and the RS-232C defined levels. The RS-232C requirements as
applied to rece iv er s are disc us sed her ei n.
The required input impedance is defined as between 3000Ω and 7000Ω for input voltages
between 3.0 and 25V in magnitude; and any voltage on the receiver input in an open circuit
condition must be less than 2.0V in magnitude. The MC1489 circuits meet these
requirements with a maximum open circuit voltage of one VBE.
The receiver shall detect a voltage between - 3.0 and - 25V as a Logic "1" and inputs
between + 3.0 and + 2.5V as a Logic "0". On some interchange leads, an open circuit of
powe r "OFF" co nditi on (300 Ω or more to ground) shall be decoded as an "OFF" condition or
Logic "1". For the reason, the input hysteresis thresholds of the MC1489 circuits are all
above ground. Thus an open or grounded input will cause the same output as a negative or
Logic "1" input.
8.1 Device characteristics
The MC1489 interface receivers have internal feedback from the second stage to the input
stage providing input hysteresis for noise rejection. The MC1489 input has typical turn-on
voltage of 1.25V and turn-off of 1.0 V for a typical hysteresis of 250mV. The MC1489A has
typical turn-on of 1.95V and turn-off of 0.8V for typically 1.15V of hysteresis.
Each receiver section has an external response control node in addition to the input and
output pins, thereby allowing the designer to vary the input threshold voltage levels. A
resistor can be connected between this node and an external power supply. Figure 4.,
Figure 6. and Figure 7. illustrate the input threshold voltage shift possible through this
technique.
This response node can also be used for the filtering of the high-frequency, high-energy
noi se pulses. Figure 11. and Figure 12. show typical noise-pulse rejection for external
capacitors of various sizes.
These two operations on the response node can be combined or used individually for may
combinations of interfacing applications. The MC1489 circuits are particularly useful for
interfacing between MOS circuits and MDTL/MTTL logic systems. In this application, the
input threshold voltages are adjusted. (with the appropriate supply and resistor values) to
fall in the center of the MOS voltage logic levels (see Figure 13.).
The response node may also be used as the receiver input as long as the designer realizes
that he may not drive this node with a low impedance source to a voltage greater than one
diode above ground or less than one diode below ground. This feature is demonstrated in
Figure 14. where two receivers are slaved to the same line that must still meet the RS-232C
impedance requirement.
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Application information MC1489/MC1489A
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)
Figure 15. Typical turn-on threshold vs
capacitance from response control
pin to GND
Figure 16. Typical turn-on threshold vs
capacitance from response control
pin to GND
Figure 17. Typical paralleling of two MC1489/A Receivers to meet RS-232C
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MC1489/MC1489A Application information
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DIM. mm. inch
MIN. TYP MAX. MIN. TYP. MAX.
a1 0.51 0.020
B 1.39 1.65 0.055 0.065
b 0.5 0.020
b1 0.25 0.010
D 20 0.787
E 8.5 0.335
e 2.54 0.100
e3 15.24 0.600
F 7.1 0.280
I 5.1 0.201
L 3.3 0.130
Z 1.27 2.54 0.050 0.100
Plastic DIP-14 MECHANICAL DATA
P001A
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Application information MC1489/MC1489A
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DIM. mm. inch
MIN. TYP MAX. MIN. TYP. MAX.
A 1.35 1.75 0.053 0.069
A1 0.1 0.25 0.004 0.010
A2 1.10 1.65 0.043 0.065
B 0.33 0.51 0.013 0.020
C 0.19 0.25 0.007 0.010
D 8.55 8.75 0.337 0.344
E 3.8 4.0 0.150 0.157
e 1.27 0.050
H 5.8 6.2 0.228 0.244
h 0.25 0.50 0.010 0.020
L 0.4 1.27 0.016 0.050
k0° 8°0° 8°
ddd 0.100 0.004
SO-14 MECHANICAL DATA
0016019D
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MC1489/MC1489A Application information
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DIM. mm. inch
MIN. TYP MAX. MIN. TYP. MAX.
A 330 12.992
C 12.8 13.2 0.504 0.519
D 20.2 0.795
N 60 2.362
T 22.4 0.882
Ao 6.4 6.6 0.252 0.260
Bo 9 9.2 0.354 0.362
Ko 2.1 2.3 0.082 0.090
Po 3.9 4.1 0.153 0.161
P 7.9 8.1 0.311 0.319
Tape & Reel SO-14 MECHANICAL DATA
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Revision history MC1489/MC1489A
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9 Revision history
Table 5. Revision history
Date Revision Changes
13-Apr-2006 4 Order codes has been updated and new template.
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MC1489/MC1489A
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