DS3695/DS3695T/DS3696/DS3696T/DS3697/DS3698 Multipoint RS485/RS422 Transceivers/Repeaters General Description Features The DS3695, DS3696, DS3697 and DS3698 are high speed differential TRI-STATEÉ bus/line transceivers/repeaters designed to meet the requirements of EIA standard RS485 with extended common mode range ( a 12V to b7V), for multipoint data transmission. The driver and receiver outputs feature TRI-STATE capability. The driver outputs remain in TRI-STATE over the entire common mode range of a 12V to b7V. Bus faults that cause excessive power dissipation within the device trigger a thermal shutdown circuit, which forces the driver outputs into the high impedance state. The DS3696 and DS3698 provide an output pin TS (thermal shutdown) which reports the occurrence of the thermal shutdown of the device. This is an ‘‘open collector’’ pin with an internal 10 kX pull-up resistor. This allows the line fault outputs of several devices to be wire OR-ed. Both AC and DC specifications are guaranteed over the 0§ C to 70§ C temperature and 4.75V to 5.25V supply voltage range. Y Y Y Y Y Y Y Y Meets EIA standard RS485 for multipoint bus transmission and is compatible with RS-422 15 ns driver propagation delays with 2 ns skew (typical) Single a 5V supply b 7V to a 12V bus common mode range permits g 7V ground difference between devices on the bus Thermal shutdown protection High impedance to bus with driver in TRI-STATE or with power off, over the entire common mode range allows the unused devices on the bus to be powered down Combined impedance of a driver output and receiver input is less than one RS485 unit load, allowing up to 32 transceivers on the bus 70 mV typical receiver hysteresis Connection and Logic Diagrams TL/F/10408 – 1 Top View TL/F/10408 – 12 Top View TL/F/10408 – 13 Top View TL/F/10408 – 14 Top View Order Number DS3695N, DS3696N, DS3697N, DS3698N, DS3695TN, DS3696TN, DS3695TJ or DS3696TJ See NS Package Number J08A or N08E Note: TS pin was LF (Line Fault) in previous datasheets and reports the occurrence of a thermal shutdown of the device. TRI-STATEÉ is a registered trademark of National Semiconductor Corporation. C1996 National Semiconductor Corporation TL/F/10408 RRD-B30M76/Printed in U. S. A. http://www.national.com DS3695/DS3695T/DS3696/DS3696T/DS3697/DS3698 Multipoint RS485/RS422 Transceivers/Repeaters March 1996 Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Continuous Power Dissipation N Package Storage Temperature Range Supply Voltage, VCC 7V 7V 7V a 15V/ b 10V Lead Temperature (Soldering, 4 sec.) a 15V/ b 10V Supply Voltage, VCC Control Input Voltages Driver Input Voltage Driver Output Voltages Receiver Input Voltages (DS3695, DS3696) Receiver Common Mode Voltage (DS3697, DS3698) 25§ C 1.07W (Note 4) b 65§ C to a 150§ C 260§ C Recommended Operating Conditions Bus Voltage Operating Free Air Temp. (TA) Commercial Industrial g 25V Receiver Output Voltage @ 5.5V Min 4.75 b7 Max 5.25 a 12 Units V V 0 a 70 a 85 §C §C b 40 Electrical Characteristics 0§ C s TA s a 70§ C, 4.75V k VCC k 5.25V unless otherwise specified (Notes 2 & 3) Symbol Parameter Conditions VOD1 Differential Driver Output Voltage (Unloaded) IO e 0 VOD2 Differential Driver Output Voltage (with Load) (Figure 1) DVOD R e 50X; (RS-422) (Note 5) R e 27X; (RS-485) Min Typ Driver Common Mode Output Voltage D lVOCl Change in Magnitude of Driver Common Mode Output Voltage for Complementary Output States VIH Input High Voltage VIL Input Low Voltage VCL Input Clamp Voltage (Figure 1) Units 5 V 2 V 1.5 V Change in Magnitude of Driver Differential Output Voltage for Complementary Output States VOC Max 0.2 V 3.0 V 0.2 V 0.8 V IIN e b18 mA b 1.5 V b 200 mA 20 mA a 1.0 mA b 0.8 mA g 100 mA a 0.2 V R e 27X 2 DI, DE, RE, E, RE/DE IIL Input Low Current VIL e 0.4V IIH Input High Current VIH e 2.4V IIN Input Current DO/RI, DO/RI RI, RI VCC e 0V or 5.25V VIN e 12V RE/DE or DE e 0V V e b7V IN DO, DO VCC e 0V or 5.25V, E e 0V b 7V k VO k a 12V IOZD TRI-STATE Current DS3697 & DS3698 VTH Differential Input Threshold Voltage for Receiver b 7V s VCM s a 12V V b 0.2 DVTH Receiver Input Hysteresis VCM e 0V VOH Receiver Output High Voltage IOH e b400 mA 70 VOL Output Low Voltage RO IOL e 16 mA (Note 5) 0.5 V TS IOL e 8 mA 0.45 V g 20 mA IOZR OFF-State (High Impedance) Output Current at Receiver VCC e Max 0.4V s VO s 2.4V RIN Receiver Input Resistance b 7V s VCM s a 12V ICC Supply Current No Load (Note 5) http://www.national.com 2 mV 2.4 V 12 kX Driver Outputs Enabled 42 60 mA Driver Outputs Disabled 27 40 mA Electrical Characteristics (Continued) 0§ C s TA s a 70§ C, 4.75V k VCC k 5.25V unless otherwise specified (Notes 2 & 3) Symbol Parameter IOSD Conditions Driver Short-Circuit Output Current IOSR Receiver Short-Circuit Output Current Max Units VO e b7V (Note 5) Min b 250 mA VO e a 12V (Note 5) a 250 mA b 85 mA VO e 0V b 15 Typ Note 1: ‘‘Absolute Maximum Ratings’’ are those beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the device should be operated at these limits. The tables of ‘‘Electrical Characteristics’’ provide conditions for actual device operation. Note 2: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to device ground unless otherwise specified. Note 3: All typicals are given for VCC e 5V and TA e 25§ C. Note 4: Derate linearly at 11.1 mW/§ C to 570 mW at 70§ C. Note 5: All limits for which Note 5 is applied must be derated by 10% for DS3695T and DS3696T. Other parameters remain the same for this extended temperature range device ( b 40§ C s TA s a 85§ C). Switching Characteristics 0§ C s TA s a 70§ C, 4.75V k VCC k 5.25V unless otherwise specified (Notes 3, 6) Receiver Switching Characteristics (Figures 2, 3 and 4) Symbol tPLH tPHL ltPLH –tPHLl Conditions CL e 15 pF S1 and S2 Closed Min Typ Max Units 15 25 37 ns 15 25 37 ns 0 ns tPLZ CL e 15 pF, S2 Open 5 12 16 ns tPHZ CL e 15 pF, S1 Open 5 12 16 ns tPZL CL e 15 pF, S2 Open 7 15 20 ns tPZH CL e 15 pF, S1 Open 7 15 20 ns Driver Switching Characteristics Symbol Conditions Min Typ Max Units 9 15 22 ns 9 15 22 ns 2 8 ns SINGLE ENDED CHARACTERISTICS (Figures 5, 6 and 7) tPLH tPHL RLDIFF e 60X CL1 e CL2 e 100 pF tSKEWltPLH – tPHLl tPLZ CL e 15 pF, S2 Open 7 15 30 ns tPHZ CL e 15 pF, S1 Open 7 15 30 ns tPZL CL e 100 pF, S2 Open 30 35 50 ns tPZH CL e 100 pF, S1 Open 30 35 50 ns 6 10 18 ns DIFFERENTIAL CHARACTERISTICS (Figures 5 and 8 ) tr, tf RLDIFF e 60X CL1 e CL2 e 100 pF Note 6: Switching Characteristics apply for DS3695, DS3695T, DS3696, DS3696T, DS3697 only. 3 http://www.national.com AC Test Circuits and Switching Waveforms TL/F/10408–15 FIGURE 1. Driver VOD and VOC TL/F/10408 – 3 FIGURE 2. Receiver Propagation Delay Test Circuit TL/F/10408 – 4 Note: Differential input voltage may be realized by grounding RI and pulsing RI between a 2.5V and b 2.5V. FIGURE 3. Receiver Input-to-Output Propagation Delay Timing TL/F/10408 – 5 FIGURE 4. Receiver Enable/Disable Propagation Delay Timing http://www.national.com 4 AC Test Circuits and Switching Waveforms (Continued) TL/F/10408 – 7 TL/F/10408 – 6 Note: Unless otherwise specified the switches are closed. FIGURE 5. Driver Propagation Delay and Transition Time Test Circuits TL/F/10408 – 8 Note: tPLH and tPHL are measured to the respective 50% points. tSKEW is the difference between propagation delays of the complementary outputs. FIGURE 6. Driver Input-to-Output Propagation Delay Timing (Single-Ended) TL/F/10408 – 9 FIGURE 7. Driver Enable/Disable Propagation Delay Timing TL/F/10408 – 10 FIGURE 8. Driver Differential Transition Timing 5 http://www.national.com Function Tables DS3695/DS3696 Transmitting Inputs RE DE DI Thermal Shutdown X X X X 1 1 0 1 1 0 X X OFF OFF OFF ON Outputs DO DO TS* (DS3696 Only) 0 1 Z Z 1 0 Z Z H H H L DS3695/DS3696 Receiving Inputs Outputs RE DE RI–RI RO TS* (DS3696 Only) 0 0 1 0 0 0 t a 0.2V s b 0.2V 1 0 Z H H H X DS3697/DS3698 Inputs E RI-RI 1 1 0 1 1 t a 0.2V s b 0.2V X t a 0.2V s b 0.2V Thermal Shutdown OFF OFF OFF ON ON Outputs DO DO RO (DS3697 Only) TS* (DS3698 Only) 0 1 Z Z Z 1 0 Z Z Z 1 0 Z 1 0 H H H L L XÐDon’t care condition ZÐHigh impedance state *TS is an ‘‘open collector’’ output with an on-chip 10 kX pull-up resistor that reports the occurrence of a thermal shutdown of the device. Typical Application TL/F/10408 – 11 Note: Repeater control logic not shown, see AN-702. http://www.national.com 6 Typical Performance Characteristics Driver VOH vs IOH vs Temperature Driver VOH vs IOH vs VCC Driver VOL vs IOL vs Temperature Driver VOL vs IOL vs VCC Driver Differential Propagation Delay vs Temperature Driver Differential Propagation Delay vs VCC Driver Single-Ended Propagation Delay vs Temperature Driver Single-Ended Propagation Delay vs VCC Driver Transition Time vs Temperature Driver Transition Time vs VCC Cable Length vs Data Rate TL/H/10408 – 16 7 http://www.national.com Typical Performance Characteristics (Continued) Supply Current vs Temperature Supply Current vs Power Supply Voltage Driver ICC vs Switching Frequency Driver Short Circuit Current vs Temperature Receiver VOH vs IOH vs Temperature Receiver VOH vs IOH vs VCC Receiver VOL vs IOL vs Temperature Receiver VOL vs IOL vs VCC Receiver Differential Propagation Delay vs Temperature Receiver Differential Propagation Delay vs VCC Receiver Short Circuit Current vs Temperature Receiver Short Circuit Current vs Power Supply TL/H/10408 – 17 http://www.national.com 8 Typical Performance Characteristics (Continued) Receiver Non-Inverting Input Current vs Temperature Receiver Non-Inverting Input Current vs Power Supply Voltage Receiver Inverting Input Current vs Temperature Receiver Inverting Input Current vs Power Supply Voltage Hysteresis and Differential Transition Voltage vs Temperature Hysteresis and Differential Transition Voltage vs VCC TL/H/10408 – 18 Physical Dimensions inches (millimeters) unless otherwise noted 8-Lead Ceramic Dual-In-Line Package (J) Order Number DS3695TJ or DS3696TJ NS Package Number J08A 9 http://www.national.com DS3695/DS3695T/DS3696/DS3696T/DS3697/DS3698 Multipoint RS485/RS422 Transceivers/Repeaters Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 8-Lead Molded Dual-In-Line Package (N) Order Number DS3695N, DS3696N, DS3697N, DS3698N, DS3695TN or DS3696TN NS Package Number N08E LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. National Semiconductor Corporation 1111 West Bardin Road Arlington, TX 76017 Tel: 1(800) 272-9959 Fax: 1(800) 737-7018 http://www.national.com 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. 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