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MC1489 MC1489A
QUAD LINE RECEIVERS
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
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.
DIP
SOP
SCHEMATIC DIAGRAM
September 2003
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MC1489/MC1489A
PIN CONFIGURATION (top view)
ORDERING CODES
DIP14 MC1489P MC1489AP SO14 MC1489D1 SO14 (TAPE & REEL) MC1489D1013TR MC1489AD1013TR
ABSOLUTE MAXIMUM RATINGS
Symbol VS VI IOL PTOT Tamb Tstg Power Supply Voltage Input Voltage Range Output Load Current Power Dissipation Operating Ambient Temperature Storage Temperature Range Parameter Value 10 30 20 1 0 to 75 -65 to 150 Unit V V mA W C C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
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ELECTRICAL CHARACTERISTICS Response Control Pin in Open; VS = 5V, Tamb = 0 to 75C, unless otherwise specified.
Symbol IIH IIL VIH VIL VOH VOL IOS IS PC Parameter Positive Input Current Negative Input Current 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 VIH = 25 V VIH = 3 V VIL = - 25 V VIL = - 3 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 All gates "ON", IO = 0 mA, VIH = 5 V VIH = 5 V 16 80 1.95 1.5 2.25 1.25 5 5 0.45 -4 26 130 V mA mA mW V V V -8.3 mA Typ. Max. 8.3 Unit mA
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
SWITCHING CHARACTERISTICS VS = 5V, Tamb = 25C, (see Figure 1)
Symbol tPLH tTHL tPHL tTHL Rise Time Propagation Delay Time Fall Time Parameter Propagation Delay 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
TEST CIRCUITS Figure 1 : Switching Response
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Figure 2 : Response Control Node
C: capacitor is for noise filtering
Figure 3 : Input Current
Figure 4 : Output Short-Circuit Current
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Figure 5 : Output Voltage and Input Threshold Voltage
Figure 6 : Power Supply Currents
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TYPICAL APPLICATIONS: Figure 7 : RS232C Data Transmission
TYPICAL CHARACTERISTICS VS = 5V, Tamb = 25C, unless otherwise specified Figure 8 : Input Current vs Input Voltage Figure 9 : MC1489 Input Threshold Voltage Adjustment
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Figure 10 : MC1489A Input Threshold Voltage Adjustment Figure 12 : Input Threshold vs Power Supply Voltage
Figure 11 : Input Threshold vs Temperature
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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. 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. Figures 2, 4 and 5 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. Figures 9 and 10 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 11). 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 12 where two receivers are slaved to the same line that must still meet the RS-232C impedance requirement. Figure 13 : Typical Turn-on Threshold vs Capacitance from Response Control Pin to GND Figure 14 : Typical Turn-on Threshold vs Capacitance from Response Control Pin to GND
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Figure 15 : Typical Paralleling of Two MC1489/A Receivers to Meet RS-232C
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Plastic DIP-14 MECHANICAL DATA
mm. DIM. MIN. a1 B b b1 D E e e3 F I L Z 1.27 3.3 2.54 0.050 8.5 2.54 15.24 7.1 5.1 0.130 0.100 0.51 1.39 0.5 0.25 20 0.335 0.100 0.600 0.280 0.201 1.65 TYP MAX. MIN. 0.020 0.055 0.020 0.010 0.787 0.065 TYP. MAX. inch
P001A
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MC1489/MC1489A
SO-14 MECHANICAL DATA
DIM. A a1 a2 b b1 C c1 D E e e3 F G L M S 3.8 4.6 0.5 8.55 5.8 1.27 7.62 4.0 5.3 1.27 0.68 8 (max.) 0.149 0.181 0.019 8.75 6.2 0.35 0.19 0.5 45 (typ.) 0.336 0.228 0.050 0.300 0.157 0.208 0.050 0.026 0.344 0.244 0.1 mm. MIN. TYP MAX. 1.75 0.2 1.65 0.46 0.25 0.013 0.007 0.019 0.003 MIN. inch TYP. MAX. 0.068 0.007 0.064 0.018 0.010
PO13G
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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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Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics All other names are the property of their respective owners (c) 2003 STMicroelectronics - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States. http://www.st.com
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