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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 P
DIP14 ( Plastic)
DESCRIPTION The MC1489 monolithic quad line receivers are designed to interface data therminal equipment with data communications equipment in conformance with the specifications of EIA Standard No. RS-232C.
D
SO14 (Plactic Micropackage)
ORDER CODES: MC1489P, MC1489AP(DIP-14 Plastic) MC1489D, MC1489AD (SO-14)
PIN CONNECTION (top view)
March 2000
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SCHEMATIC DIAGRAM (1/4 of circuit shown)
ABSOLUTE MAXIMUM RATINGS
Symbo l VS VI IOL Ptot Tamb Tstg 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 o C o C
ELECTRICAL CHARACTERISTICS Response Control Pin is Open ; VS = 5 V, T amb = 0 to 75oC, unless otherwise specified
Symbo l Parameter Positive Input Current IIH IIL VIH Negative Input Current Input Turn-on Threshold Voltage Test Co nd tio ns VIH = 25V VIH = 3V _ VIL = 25V VIL = _3V T amb = 25oC, VOL 0.45 for MC1489 IL = 10mA for MC1489A T amb = 25 C, VOL 2.5V IL = -0.5mA VIH = 0.75V, IL = -0.5mA IL = 0.5mA Input Open Circuit VIL = 3V, I L = 10mA All gates "on", I o = 0mA VIH = 5V VIH = 5V
o
Min. 3.6 0.43 -3.6 -0.43 1 1.75 0.75 2.5 2.5
T yp.
Max. 8.3 -8.3
Unit mA mA V
1.95
1.5 2.25 V 1.25
VIL VOH VOL IOS IS PC
Input Turn-off Threshold Voltage Ouptut Voltage High Output Voltage Low Output Short Circuit Current Power Supply Current Power Consumption
4 4 0.2 _ 3 16 80
5 5 0.45 _ 4 26 130
V V mA mA mW
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SWITCHING CHARACTERISTICS VS = 5V, Tamb = 25oC, see Figure 1
Symbo l Parameter Propagation delay Time tPLH tTLH tPHL tTHL Rise Time Propagation Delay Time Fall Time Test Co ndtio ns R L = 3.9k R L = 3.9k R L = 390 R L = 390 Min . Typ . Max. 25 85 120 25 10 175 50 20 Unit ns ns ns ns
TEST CIRCUITS Figure 1 :Switching Response 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 Current
TYPICAL APPLICATION : RS232C Data Transmission
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TYPICAL CHARACTERISTICS VS = 5V, T amb = 25oC, unless otherwise specified Figure 7 :Input Current
Figure 8 :MC1489 Input Threshold Voltage Adjustment
Figure 9 :MC1489A Input Threshold Voltage Adjustment
Figure 10 :Input Threshold versus Temperature
Figure 11 :Input Threshold versus Power Supply Voltag
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APPLICATION INFORMATION GENERAL 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 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 8 and 9 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 appropiate supply and resistor values) to fall in the center of the MOS voltage logic levels (see Figure 10). 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 11 where two receivers are slaved to the same line that must still meet the RS-232C impedance requirement.
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Figure 12 :Typical Turn-on Therhold versus Capacitance from Response Control Pin to GND Figure 13 :Typical Turn-on Therhold versus Capacitance from Response Control Pin to GND
Figure 14 : Typical Paralleling of Two MC1489/A Receivers to Meet RS-232C
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Plastic DIP-14 MECHANICAL DATA
mm 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 inch TYP. MAX.
DIM.
P001A
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SO-14 MECHANICAL DATA
DIM. MIN. 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 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
P013G
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Information furnished is believed to be accurate and reliable. However, STMicroelectronic s 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. Specification 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 withoutexpress written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics (c) 2000 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A. http://www.st.com .
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