DS3486 Quad RS-422, RS-423 Line Receiver General Description Features National's quad RS-422, RS-423 receiver features four independent receivers which comply with EIA Standards for the electrical characteristics of balanced/unbalanced voltage digital interface circuits. Receiver outputs are 74LS compatible, TRI-STATE® structures which are forced to a high impedance state when the appropriate output control pin reaches a logic zero condition. A PNP device buffers each output control pin to assure minimum loading for either logic one or logic zero inputs. In addition, each receiver has internal hysteresis circuitry to improve noise margin and discourage output instability for slowly changing input waveforms. ■ ■ ■ ■ ■ ■ ■ Four independent receivers TRI-STATE outputs Internal hysteresis −140 mV (typ) Fast propagation times −19 ns (typ) TTL compatible outputs 5V supply Pin compatible and interchangeable with MC3486 Block and Connection Diagrams Dual-In-Line Package 577902 577901 Top View Order Number DS3486M or DS3486N See NS Package Number M16A or N16E TRI-STATE® is a registered trademark of National Semiconductor Corporation. © 2007 National Semiconductor Corporation 5779 www.national.com DS3486 Quad RS-422, RS-423 Line Receiver April 2007 DS3486 SO Package SO Package Thermal Resistance 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, VCC 8V Input Common-Mode Voltage, VICM ±25V Input Differential Voltage, VID ±25V TRI-STATE Control Input Voltage, VI 8V Output Sink Current, IO 50 mA Storage Temperature, TSTG −65°C to +150°C Maximum Power Dissipation (Note 1) at 25°C Molded Dip Package 1362 mW 1002 mW θJA +124.5°C/W θJC +41.2°C/W Operating Conditions Max Min Units 4.75 5.25 V 0 70 °C −7.0 7.0 V Power Supply Voltage, VCC Operating Temperature, TA Input Common-Mode Voltage Range, VICR Note 1: Derate Dip molded package 10.2 mW/°C above 25°C. Derate SO package 8.01 mW/°C above 25°C. Electrical Characteristics (Note 3) (Unless otherwise noted, minimum and maximum limits apply over recommended temperature and power supply voltage ranges. Typical values are for TA = 25°C, VCC = 5V and VIC = 0V.) Symbol VIH Parameter Conditions Input Voltage—High Logic State Min Typ Max 2.0 Units V (TRI-STATE Control) VIL Input Voltage—Low Logic State 0.8 V 0.070 0.2 V 0.070 −0.2 V VI = −10V −3.25 mA VI = −3V −1.50 mA VI = 3V 1.50 mA VI = 10V 3.25 mA (TRI-STATE Control) VTH(D) −7V ≤ VIC ≤ 7V, VIH TRI-STATE = 2V Differential Input Threshold Voltage IO = −0.4 mA, VOH ≥ 2.7V IO = 8 mA, VOL ≥ 0.5V IIB (D) Input Bias Current VCC = 0V or 5.25V, Other Inputs at 0V −7V ≤ VIC ≤ 7V, VIH(3C) = 2V, Input Balance (Note 5) IOZ IOS VOH IO = −0.4 mA, VID = 0.4V VOL IO = 8 mA, VID = −0.4V 0.5 V VI(D) = 3V, VIL = 0.8V, VOL = 0.5V −40 μA VI(D) = −3V, VIL = 0.8V, VOH = 2.7V 40 μA −100 mA VIL = 0.5V −100 μA Input Current—High Logic State VIH = 2.7V 20 μA (TRI-STATE Control) VIH = 5.25V 100 μA Input Clamp Diode Voltage IIN = −10 mA −1.5 V 85 mA Output TRI-STATE Leakage Current Output Short-Circuit Current VI(D) = 3V, VIH TRI-STATE = 2V, 2.7 −15 V VO = 0V, (Note 4) IIL Input Current—Low Logic State (TRI-STATE Control) IIH VIC (TRI-STATE Control) ICC Power Supply Current All Inputs VIL = 0V Note 2: “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. 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: All currents into device pins are shown as positive, out of device pins are negative. All voltages referenced to ground unless otherwise noted. Note 4: Only one output at a time should be shorted. Note 5: Refer to EIA RS-422/3 for exact conditions. www.national.com 2 DS3486 Switching Characteristics (Unless otherwise noted, VCC = 5V and TA = 25°C.) Symbol tPHL(D) tPLH(D) tPLZ Parameter Min Typ Max Units Output High to Low 19 35 ns Output Low to High 19 30 ns Propagation Delay Time—Differential Inputs to Output TRI-STATE Control to Output Output Low to TRI-STATE 23 35 ns tPHZ Output High to TRI-STATE 25 35 ns tPZH Output TRI-STATE to High 18 30 ns tPZL Output TRI-STATE to Low 20 30 ns AC Test Circuit and Switching Time Waveforms 577903 577904 Input pulse characteristics: tTLH = tTHL = 6 ns (10% to 90%) PRR = 1 MHz, 50% duty cycle FIGURE 1. Propagation Delay Differential Input to Output 3 www.national.com DS3486 577905 1.5V for tPHZ and tPLZ 1.5V for tPLZ and tPZL Input pulse characteristics: tTLH = tTHL = 6 ns (10% to 90%) PRR = 1 MHz, 50% duty cycle tPLZ 577906 tPHZ 577907 www.national.com 4 DS3486 tPZH 577908 tPZL 577909 FIGURE 2. Propagation Delay TRI-STATE Control Input to Output 5 www.national.com DS3486 Physical Dimensions inches (millimeters) unless otherwise noted SO Package (M) Order Number DS3486M NS Package Number M16A Molded Dual-In-Line Package (N) Order Number DS3486N NS Package Number N16E www.national.com 6 DS3486 Notes 7 www.national.com DS3486 Quad RS-422, RS-423 Line Receiver Notes THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. NATIONAL MAKES NO REPRESENTATIONS OR WARRANTIES WITH RESPECT TO THE ACCURACY OR COMPLETENESS OF THE CONTENTS OF THIS PUBLICATION AND RESERVES THE RIGHT TO MAKE CHANGES TO SPECIFICATIONS AND PRODUCT DESCRIPTIONS AT ANY TIME WITHOUT NOTICE. NO LICENSE, WHETHER EXPRESS, IMPLIED, ARISING BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS DOCUMENT. TESTING AND OTHER QUALITY CONTROLS ARE USED TO THE EXTENT NATIONAL DEEMS NECESSARY TO SUPPORT NATIONAL’S PRODUCT WARRANTY. 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