Quad Line Driver
Description
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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2
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 Conditi...
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