DS36277 Dominant Mode Multipoint Transceiver General Description Features The DS36277 Dominant Mode Multipoint Transceiver is designed for use on bi-directional differential busses. It is optimal for use on Interfaces that utilize Society of Automotive Engineers (SAE) J1708 Electrical Standard. The device is similar to standard TIA/EIA-485 transceivers, but differs in enabling scheme. The Driver’s Input is normally externally tied LOW, thus providing only two states: Active (LOW), or Disabled (OFF). When the driver is active, the dominant mode is LOW, conversely, when the driver is disabled, the bus is pulled HIGH by external bias resistors. The receiver provides a FAILSAFE feature that guarantees a known output state when the Interface is in the following conditions: Floating Line, Idle Line (no active drivers), and Line Fault Conditions (open or short). The receiver output is HIGH for the following conditions: Open Inputs, Terminated Inputs (50Ω), or Shorted Inputs. FAILSAFE is a highly desirable feature when the transceivers are used with Asynchronous Controllers such as UARTs. n FAILSAFE receiver, RO = HIGH for: — OPEN inputs — Terminated inputs — SHORTED inputs n Optimal for use in SAE J1708 Interfaces n Compatible with popular interface standards: — TIA/EIA-485 and TIA/EIA-422-A — CCITT recommendation V.11 n Bi-directional transceiver — Designed for multipoint transmission n Wide bus common mode range — (−7V to +12V) n Available in plastic DIP and SOIC packages Connection and Logic Diagram Truth Tables Driver Inputs Outputs DE DI DO/RI DO /RI L L L H L H H L H X Z Z DS011384-1 Order Number DS36277TM or DS36277TN See NS Package Number M08A or N08E Receiver Inputs Output RE DO/RI–DO /RI RO L ≥ 0 mV H L ≤ −500 mV L L SHORTED H L OPEN H H X Z TRI-STATE ® is a registered trademark of National Semiconductor Corporation. © 1999 National Semiconductor Corporation DS011384 www.national.com DS36277 Dominant Mode Multipoint Transceiver July 1998 Absolute Maximum Ratings (Note 1) Storage Temperature Range Lead Temperature (Soldering 4 sec.) ESD Rating (HBM, 1.5 kΩ, 100 pF) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. −65˚C to +150˚C 260˚C ≥ 6.0 kV Recommended Operating Conditions Supply Voltage (VCC) 7V 5.5V Input Voltage (DE , RE , and DI) Driver Output Voltage/ Receiver Input Voltage −10V to +15V Receiver Output Voltage (RO) 5.5V Maximum Package Power Dissipation @ +25˚C N Package (derate 9.3 mW/˚C above +25˚C) 1168 mW M Package (derate 5.8 mW/˚C above +25˚C) 726 mW Min 4.75 −7 Max 5.25 +12 Units V V −40 +85 ˚C Min Typ Max Units 1.5 3.6 Supply Voltage, VCC Bus Voltage Operating Temperature (TA) DS36277T Electrical Characteristics (Notes 2, 4) Over recommended Supply Voltage and Operating Temperature ranges, unless otherwise specified. Symbol Parameter Conditions DRIVER CHARACTERISTICS VOD Differential Output Voltage IO = 0 mA (No Load) VoDO Output Voltage IO = 0 mA (Output to GND) VoDO Output Voltage VT1 Differential Output Voltage (Termination Load) RL = 100Ω (422) ∆VT1 Balance of VT1 RL = 54Ω RL = 54Ω (485) |VT1 − VT1 | RL = 100Ω VOS Driver Common Mode Output Voltage RL = 54Ω RL = 100Ω ∆VOS Balance of VOS RL = 54Ω |VOS − VOS | RL = 100Ω VOH Output Voltage High IOH = −22 mA VOL Output Voltage Low IOL = +22 mA IOSD Driver Short-Circuit Output Current VO = +12V 6 V 0 6 V 0 6 V 5.0 V (Figure 1 ) 1.3 2.2 1.7 2.6 (Note 3) −0.2 −0.2 (Figure 1 ) (Note 3) 0 2.5 0 2.5 −0.2 −0.2 (Figure 2 ) 2.7 (Figure 3 ) VO = −7V 5.0 V 0.2 V 0.2 V 3.0 V 3.0 V 0.2 V 0.2 3.7 V V 1.3 2 V 92 290 mA −187 −290 mA −0.150 0 V RECEIVER CHARACTERISTICS VTH Differential Input High Threshold Voltage (Note 5) −7V ≤ VCM ≤ +12V Differential Input Low Threshold Voltage (Note 5) −7V ≤ VCM ≤ +12V VHST Hysteresis (Note 6) VCM = 0V IIN Line Input Current (VCC = 4.75V, 5.25V, 0V) Other Input = 0V VI = +12V 0.5 1.5 DE = VIH (Note 7) VI = −7V −0.5 −1.5 mA IOSR Short Circuit Current VO = 0V −32 −85 mA IOZ TRI-STATE ® Leakage Current VO = 0.4 to 2.4V −20 1.4 +20 µA VOH Output High Voltage (Figure 12 ) VID = 0V, IOH = −0.4 mA 2.3 3.7 V VID = OPEN, IOH = −0.4 mA 2.3 3.7 V Output Low Voltage (Figure 12 ) VID = −0.5V, IOL = +8 mA 0.3 0.7 VID = −0.5V, IOL = +16 mA 0.3 0.8 VTL VOL RIN VO = VOH, IO = −0.4 mA VO = VOL, IO = 8.0 mA −0.230 V 80 RO Input Resistance www.national.com −0.5 −15 10 2 20 mV mA V V kΩ Electrical Characteristics (Notes 2, 4) (Continued) Over recommended Supply Voltage and Operating Temperature ranges, unless otherwise specified. Symbol Parameter Conditions Min Typ Max Units 2.0 VCC V GND 0.8 V 20 µA −100 µA DEVICE CHARACTERISTICS VIH High Level Input Voltage VIL Low Level Input Voltage IIH High Level Input Current IIL Low Level Input Current VIL = 0.4V VCL Input Clamp Voltage ICL = −18 mA ICC Output Low Voltage ICCR ICCD DE , RE , or DI VIH = 2.4V −0.7 −1.5 V DE = 0V, RE = 0V, DI = 0V 39 60 mA Supply Current DE = 3V, RE = 0V, DI = 0V 24 50 mA (No Load) DE = 0V, RE = 3V, DI = 0V 40 75 mA DE = 3V, RE = 3V, DI = 0V 27 45 mA ICCX Switching Characteristics (Note 4) Over recommended Supply Voltage and Operating Temperature ranges, unless otherwise specified. Symbol Parameter Conditions Min Typ Max Units DRIVER CHARACTERISTICS tPLHD Diff. Prop. Delay Low to High RL = 54Ω 8 17 60 ns tPHLD Diff. Prop. Delay High to Low CL = 50 pF 8 19 60 ns tSKD Diff. Skew (|tPLHD–tPHLD|) CD = 50 pF 2 10 ns tr Diff. Rise Time (Figures 4, 5 ) 11 60 ns tf Diff. Fall Time 11 60 ns tPLH Prop. Delay Low to High RL = 27Ω, CL = 15 pF 22 85 ns tPHL Prop. Delay High to Low (Figures 6, 7 ) 25 85 ns tPZH Enable Time Z to High RL = 110Ω 25 60 ns tPZL Enable Time Z to Low CL = 50 pF 30 60 ns tPHZ Disable Time High to Z (Figure 8 – Figure 11 ) 16 60 ns tPLZ Disable Time Low to Z 11 60 ns RECEIVER CHARACTERISTICS tPLH Prop. Delay Low to High VID = −1.5V to +1.5V 15 37 90 ns tPHL Prop. Delay High to Low CL = 15 pF 15 43 90 ns tSK Skew (|tPLH–tPHL|) (Figures 13, 14 ) 6 15 ns tPZH Enable Time Z to High CL = 15 pF 12 60 ns tPZL Enable Time Z to Low (Figures 15, 16 ) 28 60 ns tPHZ Disable Time High to Z 20 60 ns tPLZ Disable Time Low to Z 10 60 ns Note 1: “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 tables of “Electrical Characteristics” specify conditions for device operation. Note 2: Current into device pins is defined as positive. Current out of device pins is defined as negative. All voltages are referenced to ground unless otherwise specified. Note 3: ∆ |VT1| and ∆ |VOS| are changes in magnitude of VT1 and VOS, respectively, that occur when the input changes state. Note 4: All typicals are given for VCC = 5.0V and TA = +25˚C. Note 5: Threshold parameter limits specified as an algebraic value rather than by magnitude. Note 6: Hysteresis defined as VHST = VTH − VTL. Note 7: IIN includes the receiver input current and driver TRI-STATE leakage current. 3 www.national.com Parameter Measurement Information DS011384-2 FIGURE 1. Driver VT1 and VOS Test Circuit DS011384-3 FIGURE 2. Driver VOH and VOL Test Circuit DS011384-4 FIGURE 3. Driver Short Circuit Test Circuit DS011384-5 FIGURE 4. Driver Differential Propagation Delay and Transition Time Test Circuit www.national.com 4 Parameter Measurement Information (Continued) DS011384-6 FIGURE 5. Driver Differential Propagation Delays and Transition Times DS011384-7 FIGURE 6. Driver Propagation Delay Test Circuit DS011384-8 FIGURE 7. Driver Propagation Delays DS011384-9 S1 to DO for DI = 3V S1 to DO for DI = 0V FIGURE 8. Driver TRl-STATE Test Circuit (tPZH, tPHZ) 5 www.national.com Parameter Measurement Information (Continued) DS011384-10 FIGURE 9. Driver TRI-STATE Delays (tPZH, tPHZ) DS011384-11 S1 to DO for DI = 0V S1 to DO for DI = 3V FIGURE 10. Driver TRI-STATE Test Circuit (tPZL, tPLZ) DS011384-12 FIGURE 11. Driver TRl-STATE Delays (tPZL, tPLZ) DS011384-13 FIGURE 12. Receiver VOH and VOL DS011384-14 FIGURE 13. Receiver Propagation Delay Test Circuit www.national.com 6 Parameter Measurement Information (Continued) DS011384-15 FIGURE 14. Receiver Propagation Delays DS011384-16 FIGURE 15. Receiver TRI-STATE Delay Test Circuit DS011384-19 DS011384-17 S1 1.5V S2 CLOSED S3 CLOSED S1 1.5V S2 OPEN S3 CLOSED DS011384-20 DS011384-18 S1 −1.5V S2 CLOSED S3 OPEN S1 −1.5V S2 CLOSED S3 CLOSED FIGURE 16. Receiver Enable and Disable Timing Note 8: The input pulse is supplied by a generator having the following characteristics: f = 1.0 MHz, 50% duty cycle, tr and tf < 6.0 ns, ZO = 50Ω. Note 9: CL includes probe and stray capacitance. Note 10: Diodes are 1N916 or equivalent. 7 www.national.com Typical Performance Characteristics Differential Output Voltage vs Output Current Differential Output Voltage vs Output Current DS011384-22 Driver VOH vs IOH vs VCC DS011384-23 Driver VOH vs IOH vs Temperature DS011384-24 Driver VOL vs IOL vs VCC DS011384-25 Driver VOL vs IOL vs Temperature DS011384-26 www.national.com DS011384-27 8 Typical Performance Characteristics (Continued) Receiver VOH vs IOH vs VCC Receiver VOH vs IOH vs Temperature DS011384-28 Receiver VOL vs IOL vs VCC DS011384-29 Receiver VOL vs IOL vs Temperature DS011384-30 Supply Current vs Supply Voltage DS011384-31 Supply Current vs Temperature DS011384-32 DS011384-33 9 www.national.com Typical Performance Characteristics (Continued) Voltage Output vs Voltage Input (Hysteresis) DS011384-34 Typical Applications Information SAE J1708 Node with External Bias Resistors and Filters DS011384-21 www.national.com 10 Physical Dimensions inches (millimeters) unless otherwise noted 8-Lead Molded Package (SO) Order Number DS36277TM NS Package Number M08A 8-Lead Molded Dual-In-Line Package (N) Order Number DS36277TN NS Package Number N08E 11 www.national.com DS36277 Dominant Mode Multipoint Transceiver 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 is 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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