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. 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 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. 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 01138401 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. © 2004 National Semiconductor Corporation DS011384 www.national.com DS36277 Dominant Mode Multipoint Transceiver February 2002 DS36277 Absolute Maximum Ratings (Note 1) 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.) 260˚C ESD Rating (HBM, 1.5 kΩ, 100 pF) 5.0 kV Supply Voltage (VCC) 7V Input Voltage (DE , RE , and DI) Recommended Operating Conditions 5.5V Driver Output Voltage/ Receiver Input Voltage −10V to +15V Receiver Output Voltage (RO) −65˚C to +150˚C Supply Voltage, VCC 5.5V Bus Voltage Maximum Package Power Dissipation @ +25˚C Min Max Units 4.75 5.25 V −7 +12 V −40 +85 ˚C Operating Temperature (TA) N Package (derate 9.3 mW/˚C above +25˚C) 1168 mW M Package (derate 5.8 mW/˚C above +25˚C) 726 mW DS36277T Electrical Characteristics (Notes 2, 4) Over recommended Supply Voltage and Operating Temperature ranges, unless otherwise specified. Symbol Parameter Conditions Min Typ 1.5 3.6 Max Units 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) Balance of VT1 RL = 54Ω |VT1 − VT1 | RL = 100Ω Driver Common Mode Output Voltage RL = 54Ω RL = 100Ω Balance of VOS RL = 54Ω ∆VT1 VOS ∆VOS RL = 54Ω (485) |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 = −7V (Figure 1 ) (Note 3) 6 V 0 6 V 0 6 V 1.3 2.2 5.0 V 1.7 2.6 5.0 V 0.2 V 0.2 V −0.2 −0.2 (Figure 1 ) (Note 3) 0 2.5 3.0 V 0 2.5 3.0 V 0.2 V 0.2 V 2 V −0.2 −0.2 (Figure 2 ) 2.7 3.7 1.3 VO = +12V (Figure 3 ) 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 mA DE = VIH (Note 7) VI = −7V −0.5 −1.5 mA VTL VO = VOH, IO = −0.4 mA VO = VOL, IO = 8.0 mA −0.5 −0.230 V 80 mV IOSR Short Circuit Current VO = 0V −15 −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 VOL RIN RO Input Resistance www.national.com 10 2 20 V V kΩ (Continued) Over recommended Supply Voltage and Operating Temperature ranges, unless otherwise specified. Symbol Parameter Conditions Min Typ Max Units DEVICE CHARACTERISTICS VIH High Level Input Voltage VIL Low Level Input Voltage IIH High Level Input Current VIH = 2.4V IIL Low Level Input Current VIL = 0.4V VCL Input Clamp Voltage ICL = −18 mA DE , RE , or DI 2.0 VCC V GND 0.8 V 20 µA −100 µA −0.7 −1.5 V ICC Output Low Voltage DE = 0V, RE = 0V, DI = 0V 39 60 mA ICCR Supply Current DE = 3V, RE = 0V, DI = 0V 24 50 mA ICCD (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 ns tPLH Prop. Delay Low to High RL = 27Ω, CL = 15 pF 22 85 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 ) tPLZ Disable Time Low to Z 16 60 ns 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 ns tPZH Enable Time Z to High CL = 15 pF 12 60 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 DS36277 Electrical Characteristics (Notes 2, 4) DS36277 Parameter Measurement Information 01138402 FIGURE 1. Driver VT1 and VOS Test Circuit 01138403 FIGURE 2. Driver VOH and VOL Test Circuit 01138404 FIGURE 3. Driver Short Circuit Test Circuit 01138405 FIGURE 4. Driver Differential Propagation Delay and Transition Time Test Circuit www.national.com 4 DS36277 Parameter Measurement Information (Continued) 01138406 FIGURE 5. Driver Differential Propagation Delays and Transition Times 01138407 FIGURE 6. Driver Propagation Delay Test Circuit 01138408 FIGURE 7. Driver Propagation Delays 5 www.national.com DS36277 Parameter Measurement Information (Continued) 01138409 S1 to DO for DI = 3V S1 to DO for DI = 0V FIGURE 8. Driver TRl-STATE Test Circuit (tPZH, tPHZ) 01138410 FIGURE 9. Driver TRI-STATE Delays (tPZH, tPHZ) 01138411 S1 to DO for DI = 0V S1 to DO for DI = 3V FIGURE 10. Driver TRI-STATE Test Circuit (tPZL, tPLZ) 01138412 FIGURE 11. Driver TRl-STATE Delays (tPZL, tPLZ) www.national.com 6 DS36277 Parameter Measurement Information (Continued) 01138413 FIGURE 12. Receiver VOH and VOL 01138414 FIGURE 13. Receiver Propagation Delay Test Circuit 01138415 FIGURE 14. Receiver Propagation Delays 01138416 FIGURE 15. Receiver TRI-STATE Delay Test Circuit 7 www.national.com DS36277 Parameter Measurement Information (Continued) 01138417 S1 1.5V S2 OPEN S3 CLOSED 01138419 S1 1.5V S2 CLOSED S3 CLOSED 01138418 S1 −1.5V S2 CLOSED S3 OPEN 01138420 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. www.national.com 8 DS36277 Typical Performance Characteristics Differential Output Voltage vs Output Current Differential Output Voltage vs Output Current 01138422 01138423 Driver VOH vs IOH vs VCC Driver VOH vs IOH vs Temperature 01138424 01138425 Driver VOL vs IOL vs VCC Driver VOL vs IOL vs Temperature 01138426 01138427 9 www.national.com DS36277 Typical Performance Characteristics (Continued) Receiver VOH vs IOH vs VCC Receiver VOH vs IOH vs Temperature 01138428 01138429 Receiver VOL vs IOL vs VCC Receiver VOL vs IOL vs Temperature 01138430 01138431 Supply Current vs Supply Voltage Supply Current vs Temperature 01138432 www.national.com 01138433 10 DS36277 Typical Performance Characteristics (Continued) Voltage Output vs Voltage Input (Hysteresis) 01138434 Typical Applications Information SAE J1708 Node with External Bias Resistors and Filters 01138421 11 www.national.com DS36277 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 www.national.com 12 DS36277 Dominant Mode Multipoint Transceiver Notes National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. 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