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MC1489 MC1489A
Quad line receivers
General features
s s s s
Input resistance -3k to 7k Input signal range 30V Input threshold hysteresis built-in Response control: a) Logic threshold shifting b) Input noise filtering
DIP
Description
The MC1489 monolithic quad line receivers are designed to interface data terminal equipment with data communications equipment in conformance with the specifications of EIA Standard N RS232C.
SOP
Order code
Part Number DIP14 MC1489P MC1489AP SO14 (Tape & reel) MC1489D1013TR MC1488AD1013TR
April 2006
Rev 4
1/
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Contents
MC1489/MC1489A
Contents
1 2 3 4 5 6 7 8 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Typical applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
8.1 Device characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
9
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
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MC1489/MC1489A
Diagram
1
Figure 1.
Diagram
Schematic diagram
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Pin description
MC1489/MC1489A
2
Figure 2.
Pin description
Pin connections
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MC1489/MC1489A
Maximum ratings
3
Table 1.
Symbol VS VI IOL PTOT Tamb Tstg
Maximum ratings
Absolute maximum ratings
Parameter Power supply voltage Input voltage range Output load current Power dissipation Operating ambient temperature Storage temperature range Value 10 30 20 1 0 to 75 -65 to 150 Unit V V mA W C C
Note:
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. Thermal data
Parameter Thermal resistance junction-ambient Max Plastic DIP14 200 SO14 165 Unit C/W
Table 2.
Symbol RthJA
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Electrical characteristics
MC1489/MC1489A
4
Table 3.
Symbol IIH
Electrical characteristics
Electrical characteristics (Response control pin in open; VS = 5V, Tamb = 0 to 75C, unless otherwise specified)
Parameter Positive input current VIH = 25 V VIH = 3 V Negative input current VIL = - 25 V VIL = - 3 V Input turn-on threshold voltage Input turn-off threshold voltage Output voltage high Output voltage low Output short circuit current Power supply current Power consumption All gates "ON", IO = 0 mA, VIH = 5 V VIH = 5 V Tamb = 25C, VOL 0.45 V IL = 10 mA for MC1489 for MC1489A Test Conditions Min. 3.6 0.43 -3.6 -0.43 1 1.75 0.75 2.5 2.5 4 4 0.2 -3 16 80 1.95 1.5 V 2.25 1.25 5 V 5 0.45 -4 26 130 V mA mA mW V -8.3 mA Typ. Max. 8.3 mA Unit
IIL
VIH
VIL VOH VOL IOS IS PC
Tamb = 25C, VOL 2.5 V IL = -0.5 mA VIH = 0.75 V, IL = -0.5 mA IL = 0.5 mA Input Open Circuit VIL = 3 V, IL = 10 mA
Table 4.
Symbol tPLH tTHL tPHL tTHL
Switching characteristics (VS = 5V, Tamb = 25C)
Parameter Propagation delay time Rise time Propagation delay time Fall time Test Conditions RL = 3.9 K RL = 3.9 K RL = 390 RL = 390 Min. Typ. 25 120 25 10 Max. 85 175 50 20 Unit ns ns ns ns
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MC1489/MC1489A
Test circuit
5
Test circuit
Figure 3. Switching response
Figure 4.
Response control node
C: capacitor is for noise filtering
Figure 5.
Input current
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Test circuit Figure 6. Output short-circuit current
MC1489/MC1489A
Figure 7.
Output voltage and input threshold voltage
Figure 8.
Power supply currents
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MC1489/MC1489A
Typical applications
6
Typical applications
Figure 9. RS232C Data transmission
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Typical characteristics
MC1489/MC1489A
7
Typical characteristics
(VS = 5V, Tamb = 25C)
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
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 receivers are discussed herein. The required input impedance is defined as between 3000 and 7000 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 power "OFF" condition (300 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 noise 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
Figure 15. Typical turn-on threshold vs Figure 16. Typical turn-on threshold vs capacitance from response control capacitance from response control pin to GND pin to GND
Figure 17. Typical paralleling of two MC1489/A Receivers to meet RS-232C
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MC1489/MC1489A
Application information

Plastic DIP-14 MECHANICAL DATA
mm. DIM. MIN. a1 B b b1 D E e e3 F I L Z 1.27

inch MAX. MIN. 0.020 1.65 0.055 0.020 0.010 20 0.787 0.335 0.100 0.600 7.1 5.1 0.280 0.201 0.130 2.54 0.050 0.100 0.065 TYP. MAX.
TYP
0.51 1.39 0.5 0.25
8.5 2.54 15.24
3.3
P001A
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Application information
MC1489/MC1489A
SO-14 MECHANICAL DATA
DIM. A A1 A2 B C D E e H h L k ddd 5.8 0.25 0.4 0 mm. MIN. 1.35 0.1 1.10 0.33 0.19 8.55 3.8 1.27 6.2 0.50 1.27 8 0.100 0.228 0.010 0.016 0 TYP MAX. 1.75 0.25 1.65 0.51 0.25 8.75 4.0 MIN. 0.053 0.004 0.043 0.013 0.007 0.337 0.150 0.050 0.244 0.020 0.050 8 0.004 inch TYP. MAX. 0.069 0.010 0.065 0.020 0.010 0.344 0.157
0016019D
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MC1489/MC1489A
Application information

Tape & Reel SO-14 MECHANICAL DATA
mm. DIM. MIN. A C D N T Ao Bo Ko Po P 6.4 9 2.1 3.9 7.9 12.8 20.2 60 22.4 6.6 9.2 2.3 4.1 8.1 0.252 0.354 0.082 0.153 0.311 TYP MAX. 330 13.2 0.504 0.795 2.362 0.882 0.260 0.362 0.090 0.161 0.319 MIN. TYP. MAX. 12.992 0.519 inch
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Revision history
MC1489/MC1489A
9
Table 5.
Date
Revision history
Revision history
Revision 4 Changes Order codes has been updated and new template.
13-Apr-2006
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MC1489/MC1489A
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