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DS1489/DS1489A Quad Line Receiver
July 2002
DS1489/DS1489A Quad Line Receiver
General Description
The DS1489/DS1489A are quad line receivers designed to interface data terminal equipment with data communications equipment. They are constructed on a single monolithic silicon chip. These devices satisfy the specifications of EIA Standard RS-232D. The DS1489/DS1489A meet and exceed the specifications of MC1489/MC1489A and are pin-for-pin replacements.
Features
n n n n n Four separate receivers per package Programmable threshold Built-in input threshold hysteresis “Fail safe” operating mode: high output for open inputs Inputs withstand ± 30V
Schematic and Connection Diagrams
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(1⁄4 of unit shown) DS1489: RF = 10k DS1489A: RF = 2k
Dual-In-Line or Small-Out Line Package
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Top View Order Number DS1489M, DS1489MX, DS1489N, DS1489AM, DS1489AMX or DS1489AN See NS Package Number M14A or N14A
© 2002 National Semiconductor Corporation
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DS1489/DS1489A
AC Test Circuit and Voltage Waveforms
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FIGURE 1.
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DS1489/DS1489A
Absolute Maximum Ratings
(Note 2)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Power Supply Voltage Input Voltage Range Output Load Current Power Dissipation (Note 3) Operating Temperature Range Storage Temperature Range 10V Maximum Power Dissipation (Note 1) at 25˚C Molded DIP Package SO Package Lead Temperature (Soldering, 4 sec.) 1207 mW 1042 mW 260˚C
± 30V
20 mA 1W 0˚C to +75˚C −65˚C to +150˚C
Note 1: Derate molded DIP package 9.7 mW/˚C above 25˚C; derate SO package 8.33 mW/˚C above 25˚C.
Electrical Characteristics (Notes 3, 4, 5)
DS1489/DS1489A: The following apply for VCC = 5.0V ± 1%, 0˚C ≤ TA ≤ +75˚C unless otherwise specified. Symbol VTH Parameter Input High Threshold Voltage VOUT ≤ 0.45V, IOUT = 10 mA Conditions DS1489 DS1489A VOUT ≥ 2.5V, IOUT = −0.5 mA IIN Input Current VIN = +25V VIN = −25V VIN = +3V VIN = −3V VOH VOL ISC ICC Pd Output High Voltage Output Low Voltage Output Short Circuit Current Supply Current Power Dissipation IOUT = −0.5 mA VIN = 0.75V Input = Open VIN = 3.0V, IOUT = 10 mA VIN = 0.75V VIN = 5.0V VIN = 5.0V TA = 25˚C TA = 25˚C TA = 25˚C Min 1.0 0.9 1.75 1.55 0.75 0.65 +3.6 −3.6 +0.43 −0.43 2.6 2.6 +5.6 −5.6 +0.53 −0.53 3.8 3.8 0.33 −3.0 14 70 26 130 5.0 5.0 0.45 1.00 2.00 Typ 1.25 Max 1.5 1.6 2.25 2.40 1.25 1.35 +8.3 −8.3 Units V V V V V V mA mA mA mA V V V mA mA mW
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VTL Input Low Threshold Voltage
Switching Characteristics
VCC = 5V, TA = 25˚C Symbol tpd1 tpd0 tr tf Parameter Input to Output “High” Propagation Delay Input to Output “Low” Propagation Delay Output Rise Time Output Fall Time RL = 3.9k, (Figure 1) (AC Test Circuit) RL = 390Ω, (Figure 1) (AC Test Circuit) 110 9 175 20 ns ns RL = 390Ω, (Figure 1) (AC Test Circuit) 20 50 ns Conditions RL = 3.9k, (Figure 1) (AC Test Circuit) Min Typ 28 Max 85 Units ns
Note 2: “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. Except for “Operating Temperature Range” they are not meant to imply that the devices should be operated at these limits. The table of “Electrical Characteristics” provides conditions for actual device operation. Note 3: Unless otherwise specified min/max limits apply across the 0˚C to +75˚C temperature range for the DS1489 and DS1489A. Note 4: All currents into device pins shown as positive, out of device pins as negative, all voltages referenced to ground unless otherwise noted. All values shown as max or min on absolute value basis. Note 5: These specifications apply for response control pin = open.
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DS1489/DS1489A
Typical Characteristics
VCC = 5.0V, TA = +25˚C unless otherwise noted
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FIGURE 2. Input Current
FIGURE 5. Input Threshold Voltage vs Temperature
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FIGURE 3. DS1489 Input Threshold Voltage Adjustment
FIGURE 6. Input Threshold vs Power Supply Voltage
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FIGURE 4. DS1489A Input Threshold Voltage Adjustment
FIGURE 7. Noise Rejection vs Capacitance for DS1489A
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DS1489/DS1489A
Typical Application Information
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*Optional for noise filtering.
Applications Using the Response Control Pin Noise Filter See Figure 7 Threshold Shift See Figures 3, 4 Noise Filter and Threshold Shift See Figures 3, 4, 7
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Application of DS1488, DS1489A and UART
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DS1489/DS1489A
Physical Dimensions
unless otherwise noted
inches (millimeters)
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SO Package (M) Order Number DS1489M, DS1489MX or DS1489AM, DS1489AMX NS Package Number M14A
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DS1489/DS1489A Quad Line Receiver
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
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