MC1489 MC1489A QUAD LINE RECEIVERS ■ ■ ■ ■ 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 conformance with the specifications of EIA Standard N° RS232C. DIP SOP SCHEMATIC DIAGRAM September 2003 1/13 MC1489/MC1489A PIN CONFIGURATION (top view) ORDERING CODES DIP14 SO14 SO14 (TAPE & REEL) MC1489P MC1489AP MC1489D1 MC1489D1013TR MC1489AD1013TR ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit V VS Power Supply Voltage 10 VI Input Voltage Range ±30 V IOL Output Load Current 20 mA PTOT Power Dissipation Tamb Operating Ambient Temperature Tstg Storage Temperature Range 1 W 0 to 75 °C -65 to 150 °C Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. 2/13 MC1489/MC1489A ELECTRICAL CHARACTERISTICS Response Control Pin in Open; VS = 5V, Tamb = 0 to 75°C, unless otherwise specified. Symbol IIH IIL Parameter Positive Input Current Negative Input Current Test Conditions VIH = 25 V 3.6 VIH = 3 V 0.43 VIL = - 25 V -3.6 VIL = - 3 V -0.43 Input Turn-On Threshold Voltage Tamb = 25°C, VOL ≤ 0.45 V IL = 10 mA Tamb = 25°C, VOL ≥ 2.5 V IL = -0.5 mA VOH Input Turn-Off Threshold Voltage Output Voltage High VOL Output Voltage Low IOS IS Output Short Circuit Current Power Supply Current PC Power Consumption VIH VIL Min. for MC1489 for MC1489A 1 1.75 Typ. 1.95 0.75 VIH = 0.75 V, IL = -0.5 mA 2.5 IL = 0.5 mA Input Open Circuit 2.5 4 Max. Unit 8.3 mA -8.3 mA 1.5 2.25 V 1.25 V 5 V 4 5 0.2 0.45 V -3 -4 mA All gates "ON", IO = 0 mA, VIH = 5 V 16 26 mA VIH = 5 V 80 130 mW Typ. Max. Unit VIL = 3 V, IL = 10 mA SWITCHING CHARACTERISTICS VS = 5V, Tamb = 25°C, (see Figure 1) Symbol Parameter Test Conditions Min. tPLH Propagation Delay Time RL = 3.9 KΩ 25 85 ns tTHL Rise Time RL = 3.9 KΩ 120 175 ns tPHL Propagation Delay Time RL = 390 Ω 25 50 ns tTHL Fall Time RL = 390 Ω 10 20 ns TEST CIRCUITS Figure 1 : Switching Response 3/13 MC1489/MC1489A Figure 2 : Response Control Node C: capacitor is for noise filtering Figure 3 : Input Current Figure 4 : Output Short-Circuit Current 4/13 MC1489/MC1489A Figure 5 : Output Voltage and Input Threshold Voltage Figure 6 : Power Supply Currents 5/13 MC1489/MC1489A TYPICAL APPLICATIONS: Figure 7 : RS232C Data Transmission TYPICAL CHARACTERISTICS VS = 5V, Tamb = 25°C, unless otherwise specified Figure 8 : Input Current vs Input Voltage 6/13 Figure 9 : MC1489 Input Threshold Voltage Adjustment MC1489/MC1489A Figure 10 : MC1489A Input Threshold Voltage Adjustment Figure 12 : Input Threshold vs Power Supply Voltage Figure 11 : Input Threshold vs Temperature 7/13 MC1489/MC1489A 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 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 power "OFF" condition (300Ω 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 8/13 Figure 14 : Typical Turn-on Threshold vs Capacitance from Response Control Pin to GND MC1489/MC1489A Figure 15 : Typical Paralleling of Two MC1489/A Receivers to Meet RS-232C 9/13 MC1489/MC1489A Plastic DIP-14 MECHANICAL DATA mm. inch DIM. MIN. a1 0.51 B 1.39 TYP MAX. MIN. TYP. MAX. 0.020 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 Z 3.3 1.27 0.130 2.54 0.050 0.100 P001A 10/13 MC1489/MC1489A SO-14 MECHANICAL DATA DIM. mm. MIN. TYP A a1 inch MAX. MIN. TYP. 1.75 0.1 0.068 0.2 a2 MAX. 0.003 0.007 1.65 0.064 b 0.35 0.46 0.013 0.018 b1 0.19 0.25 0.007 0.010 C 0.5 0.019 c1 45˚ (typ.) D 8.55 8.75 0.336 0.344 E 5.8 6.2 0.228 0.244 e 1.27 0.050 e3 7.62 0.300 F 3.8 4.0 0.149 0.157 G 4.6 5.3 0.181 0.208 L 0.5 1.27 0.019 0.050 M S 0.68 0.026 8 ˚ (max.) PO13G 11/13 MC1489/MC1489A Tape & Reel SO-14 MECHANICAL DATA mm. inch DIM. MIN. A MAX. MIN. 330 13.2 TYP. MAX. 12.992 C 12.8 D 20.2 0.795 N 60 2.362 T 12/13 TYP 0.504 22.4 0.519 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 MC1489/MC1489A 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 © 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 13/13