DS3695/DS3695T/DS3696/DS3697 Multipoint RS485/RS422 Transceivers/Repeaters General Description Features The DS3695, DS3696, and DS3697 are high speed differential TRI-STATE ® bus/line transceivers/repeaters designed to meet the requirements of EIA standard RS485 with extended common mode range (+12V to −7V), 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 +12V to −7V. 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 provides 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 kΩ 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. n Meets EIA standard RS485 for multipoint bus transmission and is compatible with RS-422 n 15 ns driver propagation delays with 2 ns skew (typical) n Single +5V supply n −7V to +12V bus common mode range permits ± 7V ground difference between devices on the bus n Thermal shutdown protection n 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 n Combined impedance of a driver output and receiver input is less than one RS485 unit load, allowing up to 32 transceivers on the bus n 70 mV typical receiver hysteresis Connection and Logic Diagrams DS010408-1 Top View DS010408-12 Top View DS010408-13 Top View Order Number DS3695N, DS3695TN, DS3696N, or DS3697N See NS Package Number N08E Note 1: TS pin was LF (Line Fault) in previous datasheets and reports the occurrence of a thermal shutdown of the device. TRI-STATE ® is a registered trademark of National Semiconductor Corporation. © 1998 National Semiconductor Corporation DS010408 www.national.com DS3695/DS3695T/DS3696/DS3697 Multipoint RS485/RS422 Transceivers/Repeaters May 1998 Absolute Maximum Ratings (Note 2) Storage Temperature Range If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Lead Temperature (Soldering, 4 sec.) Supply Voltage, VCC Control Input Voltages Driver Input Voltage Driver Output Voltages Receiver Input Voltages (DS3695, DS3696) Receiver Common Mode Voltage (DS3697) Receiver Output Voltage Continuous Power Dissipation @ 25˚C N Package −65˚C to +150˚C 260˚C Recommended Operating Conditions 7V 7V 7V +15V/−10V Supply Voltage, VCC Bus Voltage Operating Free Air Temp. (TA) Commercial Industrial +15V/−10V ± 25V 5.5V Min 4.75 −7 Max 5.25 +12 Units V V 0 −40 +70 +85 ˚C ˚C 1.07W (Note 4) Electrical Characteristics (Notes 3, 4) 0˚C ≤ TA ≤ +70˚C, 4.75V < VCC < 5.25V unless otherwise specified Symbol VOD1 Parameter Conditions Min Typ IO = 0 Differential Driver Output Max Units 5 V Voltage (Unloaded) VOD2 R = 50Ω; (RS-422) (Note 6) R = 27Ω; (RS-485) (Figure 1 ) Differential Driver Output Voltage (with Load) ∆VOD 2 V 1.5 V Change in Magnitude of Driver Differential Output Voltage for 0.2 V 3.0 V 0.2 V 0.8 V Complementary Output States VOC Driver Common Mode Output Voltage ∆|VOC| Change in Magnitude of Driver R = 27Ω (Figure 1 ) Common Mode Output Voltage for Complementary Output States VIH Input High Voltage VIL Input Low Voltage VCL Input Clamp Voltage IIL Input Low Current IIH Input High Current IIN Input Current 2 RE , E, RE /DE DO/RI, DO /RI RI, RI IOZD VTH TRI-STATE Current V DI, DE, DO, DO VCC = 0V or 5.25V IIN = −18 mA VIL = 0.4V −1.5 V −200 µA VIH = 2.4V VIN = 12V 20 µA +1.0 mA −0.8 mA ± 100 µA +0.2 V RE /DE or DE = VIN = −7V 0V VCC = 0V or 5.25V, E = 0V DS3697 & DS3698 −7V < VO < +12V Differential Input Threshold −7V ≤ VCM ≤ +12V −0.2 Voltage for Receiver ∆VTH Receiver Input Hysteresis VOH Receiver Output High Voltage VOL Output Low Voltage RO TS IOZR RIN VCM = 0V IOH = −400 µA IOL = 16 mA (Note 6) IOL = 8 mA OFF-State (High Impedance) VCC = Max Output Current at Receiver 0.4V ≤ VO ≤ 2.4V Receiver Input Resistance −7V ≤ VCM ≤ +12V www.national.com 2 70 mV 2.4 12 V 0.5 V 0.45 V ± 20 µA kΩ Electrical Characteristics (Notes 3, 4) (Continued) 0˚C ≤ TA ≤ +70˚C, 4.75V < VCC < 5.25V unless otherwise specified Symbol Typ Max Units Supply Current No Load Driver Outputs Enabled 42 60 mA 27 40 mA IOSD Driver Short-Circuit Output Current (Note 6) Driver Outputs Disabled VO = −7V (Note 6) VO = +12V (Note 6) −250 mA IOSR Receiver Short-Circuit Output Current VO = 0V ICC Parameter Conditions Min −15 +250 mA −85 mA Note 2: “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 3: 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 4: All typicals are given for VCC = 5V and TA = 25˚C. Note 5: Derate linearly at 11.1 mW/˚C to 570 mW at 70˚C. Note 6: 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 (−40˚C ≤ TA ≤ +85˚C). Switching Characteristics (Notes 4, 7) 0˚C ≤ TA ≤ +70˚C, 4.75V < VCC < 5.25V unless otherwise specified Receiver Switching Characteristics (Figures 2, 3, 4) tPLH Symbol Conditions CL = 15 pF Min Typ Max Units 15 25 37 tPHL ns S1 and S2 15 25 37 |tPLH–tPHL| 0 tPZL Closed CL = 15 pF, S2 Open CL = 15 pF, S1 Open CL = 15 pF, S2 Open tPZH CL = 15 pF, S1 Open tPLZ tPHZ ns ns 5 12 16 ns 5 12 16 ns 7 15 20 ns 7 15 20 ns Driver Switching Characteristics Symbol Conditions Min SINGLE ENDED CHARACTERISTICS (Figures 5, 6, 7) tPLH RLDIFF = 60Ω Typ Max Units 9 15 22 ns CL1 = CL2 = 100 pF 9 15 22 ns 2 8 ns 7 15 30 ns 7 15 30 ns tPZL CL = 15 pF, S2 Open CL = 15 pF, S1 Open CL = 100 pF, S2 Open 30 35 50 ns tPZH CL = 100 pF, S1 Open 30 35 50 ns 6 10 18 ns tPHL tSKEW|tPLH–tPHL| tPLZ tPHZ DIFFERENTIAL CHARACTERISTICS (Figures 5, 8) tr, tf RLDIFF = 60Ω CL1 = CL2 = 100 pF Note 7: Switching Characteristics apply for DS3695, DS3695T, DS3696, DS3697 only. 3 www.national.com AC Test Circuits and Switching Waveforms DS010408-15 FIGURE 1. Driver VOD and VOC DS010408-3 FIGURE 2. Receiver Propagation Delay Test Circuit DS010408-4 Note: Differential input voltage may be realized by grounding RI and pulsing RI between +2.5V and −2.5V. FIGURE 3. Receiver Input-to-Output Propagation Delay Timing DS010408-5 FIGURE 4. Receiver Enable/Disable Propagation Delay Timing www.national.com 4 AC Test Circuits and Switching Waveforms (Continued) DS010408-7 DS010408-6 Note: Unless otherwise specified the switches are closed. FIGURE 5. Driver Propagation Delay and Transition Time Test Circuits DS010408-8 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) DS010408-9 FIGURE 7. Driver Enable/Disable Propagation Delay Timing DS010408-10 FIGURE 8. Driver Differential Transition Timing 5 www.national.com Function Tables DS3695/DS3696 Transmitting Inputs RE Thermal DE DI Outputs Shutdown DO TS * DO (DS3696 Only) X 1 1 OFF 0 1 X 1 0 OFF 1 0 H H X 0 X OFF Z Z H X 1 X ON Z Z L DS3695/DS3696 Receiving Inputs RE Outputs DE RI–RI TS * RO (DS3696 Only) 0 0 ≥ +0.2V 1 0 0 ≤ −0.2V 0 H 1 0 X Z H H DS3697 Inputs E RI-RI Thermal Shutdown Outputs DO DO RO (DS3697 Only) 1 ≥ +0.2V OFF 0 1 1 ≤ −0.2V OFF 1 0 0 0 X OFF Z Z Z 1 ≥ +0.2V ON Z Z 1 1 ≤ −0.2V ON Z Z 0 1 X — Don’t care condition Z — High impedance state *TS is an “open collector” output with an on-chip 10 kΩ pull-up resistor that reports the occurrence of a thermal shutdown of the device. Typical Application DS010408-11 Note: Repeater control logic not shown, see AN-702. www.national.com 6 Typical Performance Characteristics Driver VOH vs IOH vs Temperature Driver VOH vs IOH vs VCCDriver VOH vs IOH vs VCC DS010408-19 DS010408-20 Driver Differential Propagation Delay vs Temperature Driver VOH vs IOH vs VCC Driver VOL vs IOL vs Temperature DS010408-21 Driver Differential Propagation Delay vs VCC DS010408-22 DS010408-23 Driver Single-Ended Propagation Delay vs Temperature Driver Single-Ended Propagation Delay vs VCC DS010408-25 DS010408-24 Driver Transition Time vs Temperature DS010408-26 DS010408-27 7 www.national.com Typical Performance Characteristics (Continued) Driver Transition Time vs VCC Cable Length vs Data Rate DS010408-29 DS010408-28 Supply Current vs Temperature Supply Current vs Power Supply Voltage DS010408-30 Driver Short Circuit Current vs Temperature Driver ICC vs Switching Frequency Receiver VOH vs IOH vs Temperature Receiver VOH vs IOH vs VCC DS010408-34 DS010408-33 www.national.com DS010408-32 DS010408-31 8 DS010408-35 Typical Performance Characteristics Receiver VOL vs IOL vs Temperature (Continued) Receiver Differential Propagation Delay vs Temperature Receiver VOL vs IOL vs VCC DS010408-36 DS010408-37 DS010408-38 Receiver Differential Propagation Delay vs VCC Receiver Short Circuit Current vs Temperature Receiver Short Circuit Current vs Power Supply DS010408-40 DS010408-41 DS010408-39 Receiver Non-Inverting Input Current vs Temperature Receiver Non-Inverting Input Current vs Power Supply Voltage DS010408-42 Receiver Inverting Input Current vs Temperature DS010408-43 9 DS010408-44 www.national.com Typical Performance Characteristics Receiver Inverting Input Current vs Power Supply Voltage (Continued) Hysteresis and Differential Transition Voltage vs Temperature DS010408-45 www.national.com DS010408-46 10 Hysteresis and Differential Transition Voltage vs VCC DS010408-47 11 DS3695/DS3695T/DS3696/DS3697 Multipoint RS485/RS422 Transceivers/Repeaters Physical Dimensions inches (millimeters) unless otherwise noted 8-Lead Molded Dual-In-Line Package (N) Order Number DS3695N, DS3696N, DS3697N, or DS3695TN 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: 2. A critical component in any component of a life support 1. Life support devices or systems are devices or sysdevice or system whose failure to perform can be reatems which, (a) are intended for surgical implant into sonably expected to cause the failure of the life support the body, or (b) support or sustain life, and whose faildevice or system, or to affect its safety or effectiveness. ure 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. 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