National DS36C278 manual

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Table of contents for the manual

  • Page 1

    TL/F/12040 DS36C278 Low Power Multipoint EIA-RS-485 Transceiver December 1995 DS36C278 Low Power Multipoint EIA-RS-485 Transceiver General Description The DS36C278 is a low power differential bus/line trans- ceiver designed to meet the requirements of RS-485 stan- dard for multipoint data transmission. In addition it is com- patible with TIA/EIA-42[...]

  • Page 2

    Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Supply Voltage (V CC ) a 12V Input Voltage (DE, RE * , & DI) b 0.5V to (V CC a 0.5V) Common Mode (V CM ) Driver Output/Receiver Input g 15V Input Voltage[...]

  • Page 3

    Electrical Characteristics (Continued) Over Supply Voltage and Operating Temperature ranges, unless otherwise specified (Notes 2 and 3) Symbol Parameter Conditions Reference Min Typ Max Units I IN Line Input Current Other Input e 0V, DS36C278 V IN ea 12V 0 0.19 0.25 mA DE e V IL ,R E * e V IL , (Note 7) V IN eb 7V 0 b 0.1 b 0.2 mA V CC e 4.75 to 5.[...]

  • Page 4

    Switching Characteristics (Continued) Over Supply Voltage and Operating Temperature ranges, unless otherwise specified (Notes 3 and 8) Symbol Parameter Conditions Reference Min Typ Max Units RECEIVER CHARACTERISTICS t PHL Propagation Delay C L e 15 pF Figures 12, 13 30 210 400 ns High to Low t PLH Propagation Delay 30 190 400 ns Low to High t SK Sk[...]

  • Page 5

    Parameter Measurement Information (Continued) TL/F/12040 – 6 FIGURE 6. Driver Differential Propagation Delays and Differential Rise and Fall Times TL/F/12040 – 7 FIGURE 7. TRI-STATE Test Circuit (t PZH ,t PHZ ) TL/F/12040 – 8 FIGURE 8. TRI-STATE Waveforms (t PZH ,t PHZ ) TL/F/12040 – 9 FIGURE 9. TRI-STATE Test Circuit (t PZL ,t PLZ ) TL/F/1[...]

  • Page 6

    Parameter Measurement Information (Continued) TL/F/12040 – 13 FIGURE 13. Receiver Differential Propagation Delay Waveforms TL/F/12040 – 14 FIGURE 14. Receiver TRI-STATE Test Circuit TL/F/12040 – 15 FIGURE 15. Receiver Enable and Disable Waveforms (t PLZ ,t PZL ) TL/F/12040 – 16 FIGURE 16. Receiver Enable and Disable Waveforms (t PHZ ,t PZH [...]

  • Page 7

    Typical Application Information TL/F/12040 – 17 FIGURE 17. Typical RS-485 Bus Interface TABLE I. Device Pin Descriptions Pin No. Name Description 1 RO Receiver Output: When RE (Receiver Enable) is LOW, the receiver is enabled (ON), if DO/RI t DO * /RI * by 200 mV, RO will be HIGH. If DO/RI s DO * /RI * by 200 mV, RO will be LOW. Additionally RO w[...]

  • Page 8

    http:/ /www .national.com 8[...]

  • Page 9

    Physical Dimensions inches (millimeters) 8-Lead (0.150 × Wide) Molded Small Outline Package, JEDEC Order Number DS36C278TM, DS36C278M NS Package Number M08A http:/ /www .national.com 9[...]

  • Page 10

    DS36C278 Low Power Multipoint EIA-RS-485 Transceiver Physical Dimensions inches (millimeters) (Continued) 8-Lead (0.300 × Wide) Molded Dual-In-Line Package Order Number DS36C278TN, DS36C278N 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 [...]