DS36C279 DS36C279 Power EIA-RS-485 Transceiver with Sleep Mode
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DS36C279 Power EIA-RS-485 Transceiver with Sleep Mode
DS36C279
DS36C279 Power EIA-RS-485 Transceiver with Sleep Mode
General Description
DS36C279 power differential bus/line transceiver designed meet requirements RS-485 Standard multipoint data transmission. addition compatible with TIA/EIA-422-B. sleep mode feature automatically puts device power saving mode when both driver receiver disabled. device ideal power conscious applications where device disabled extended periods time. driver receiver outputs feature TRI-STATE capability. driver outputs operate over entire common mode range +12V. contention fault situations that cause excessive power dissipation within device handled thermal shutdown circuit, which forces driver outputs into high impedance state. receiver incorporates fail safe circuit which guarantees high output state when inputs left open. DS36C279T fully specified over industrial temperature range (-40°C +85°C).
Features
100% RS-485 compliant Guaranteed RS-485 device interoperation power CMOS design: Automatic sensing sleep mode Reduces maximum Built-in power up/down glitch-free circuitry Permits live transceiver intersection/displacement SOIC packages available Industrial temperature range: -40°C +85°C On-board thermal shutdown circuitry Prevents damage device event excessive power dissipation Wide common mode range: +12V Receive open input fail-safe (Note unit load (DS36C279): nodes unit load (DS36C279T): nodes (Human Body Model): Drop-in replacement for: LTC485 MAX485 DS75176 DS3695
Connection Logic Diagram
Truth Table
DRIVER SECTION RI-RI* +0.2V -0.2V OPEN (Note DO/RI DO*/RI* (Note
RECEIVER SECTION
DS012053-1
Order Number DS36C279M, DS36C279N, DS36C279or DS36C279TN Package Number M08A N08E
Note Non-terminated, open input only Note Device enters sleep mode enable conditions held
TRI-STATE registered trademark National Semiconductor Corporation.
1997 National Semiconductor Corporation
DS012053
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PrintDate=1997/03/11 PrintTime=14:31:17 5746 ds012053 Rev.
Proof
Absolute Maximum Ratings
(Note
Military/Aerospace specified devices required, please contact National Semiconductor Sales Office/ Distributors availability specifications. Supply Voltage (VCC) +12V Input Voltage (DE, RE*, -0.5V (VCC +0.5V) Common Mode (VCM) Driver Output/Receiver Input Input Voltage (DO/RI, DO*/RI*) Receiver Output Voltage -0.5V (VCC +0.5V) Maximum Package Power Dissipation +25°C Package 1190 derate mW/°C above +25°C Package derate mW/°C above +25°C
Storage Temperature Range Lead Temperature (Soldering sec)
-65°C +150°C +260°C
Recommended Operating Conditions
Supply Voltage (VCC) Voltage DS36C279T DS36C279 +4.75 +5.0 +5.25 Units
Operating Free Temperature (TA)
Electrical Characteristics
Symbol VOD1 VOD0 VOD0* VOD2 VOD2 VOD3 IOSD Parameter Differential Output Voltage Output Voltage Output Voltage Differential Output Voltage (Termination Load) Balance VOD2 |VOD2 VOD2*| Differential Output Voltage (Full Load) Driver Common Mode Output Voltage Balance |VOC VOC*| Driver Output Short-Circuit Current RECEIVER CHARACTERISTICS VHST Differential Input High Threshold Voltage Differential Input Threshold Voltage Hysteresis Input Resistance Line Input Current (Note
(Notes Conditions Reference (422) (485) (422) (485) (Note (422, 485) -0.2 -0.2 -190 +0.035 (Note (422, 485) (Note DS36C279T DS36C279 DS36C279 DS36C279T DS36C279 DS36C279T +12V +12V +12V +12V (422) (Note -0.2 -0.035 0.19 -0.1 0.19 -0.1 0.19 -0.1 0.19 -0.1 0.25 -0.2 -0.4 0.25 -0.2 -0.4 +0.2 +0.2 +250 -250 +0.2 Units
Over Supply Voltage Operating Temperature ranges, unless otherwise specified DIFFERENTIAL DRIVER CHARACTERISTICS Load) (Output GND) VTEST +12V +12V VOH, -0.4 +12V VOL, +12V +12V Other Input VIL, VIL, 4.75 5.25 IING Line Input Current Glitch (Note Other Input VIL, VIL, +3.0V 25°C Input Balance Test (485) (422) (Note (422, 485) (485) Figure (485)
Figure
Figure Figure
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PrintDate=1997/03/11 PrintTime=14:31:20 5746 ds012053 Rev.
Proof
Electrical Characteristics
Symbol IOSR IOZR Parameter High Level Output Voltage Level Output Voltage Short Circuit Current TRI-STATE Leakage Current High Level Input Voltage Level Input Voltage High Level Input Current Level Input Current Power Supply Current Load)
(Notes (Continued)
Over Supply Voltage Operating Temperature ranges, unless otherwise specified Conditions +0.2V -0.2V 0.4V 2.4V Reference Figure Units RECEIVER CHARACTERISTICS
DEVICE CHARACTERISTICS ICCR ICCD ICCX RE*,
+3.0V Driver Receiver Driver OFF, Receiver Driver Receiver Sleep Mode
Switching Characteristics
Symbol tPHLD tPLHD tSKD tPHZ tPLZ tPZH tPZL tPSH tPSL Parameter Differential Propagation Delay High Differential Propagation Delay High Differential Skew |tPHLD tPLHD| Rise Time Fall Time Disable Time High Disable Time Enable Time High Enable Time Driver Enable from Sleep Mode Output High Driver Enble from Sleep Mode Output RECEIVER CHARACTERISTICS tPHL tPLH tPLZ tPHZ tPZL tPZH Output Enable Time Propagation Delay High Propagation Delay High Skew, |tPHL tPLH| Output Disable Time DRIVER CHARACTERISTICS
(Notes Conditions Reference Units
Over Supply Voltage Operating Temperature ranges, unless otherwise specified
Figures
(Note (Note
Figures Figures Figures Figures Figures Figures
Figures
Figures
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PrintDate=1997/03/11 PrintTime=14:31:21 5746 ds012053 Rev.
Proof
Switching Characteristics
Symbol tPSH tPSL Parameter Receiver Enable from Sleep Mode Output High Receiver Enable from Sleep Mode Output
(Notes (Continued)
Over Supply Voltage Operating Temperature ranges, unless otherwise specified Conditions (Note (Note Reference Units RECEIVER CHARACTERISTICS
Figures Figures
Note "Absolute Maximum Ratings" those values beyond which safety device cannot guaranteed. They meant imply that devices should operated these limits. table "Electrical Characteristics" specifies conditions device operation. Note Current into device pins defined positive. Current device pins defined negative. voltages referenced ground except VOD1 VOD2. Note typicals given for: +5.0V, 25°C. Note Delta |VOD2| Delta |VOC| changes magnitude VOD2 VOC, respectively, that occur when input changes state. Note Threshold parameter limits specified algebraic value rather than magnitude. Note Hysteresis defined VHST VTL. Note includes receiver input current driver TRI-STATE leakage current. Note includes probe capacitance. Note enable from sleep mode delays greater than prior test (device sleep mode). Note complete details test, RS-485.
Parameter Measurement Information
DS012053-3 DS012053-2
FIGURE Driver
FIGURE Driver VOD2
DS012053-4
Vtest +12V
DS012053-17
FIGURE Driver IOSD
FIGURE Driver VOD3
DS012053-5
FIGURE Driver Differential Propagation Delay Test Circuit
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PrintDate=1997/03/11 PrintTime=14:31:23 5746 ds012053 Rev.
Proof
Parameter Measurement Information
(Continued)
DS012053-6
FIGURE Driver Differential Propagation Delays Differential Rise Fall Times
DS012053-10
FIGURE TRI-STATE Sleep Mode Waveforms (tPZL, (tPSL), tPLZ)
DS012053-7
FIGURE TRI-STATE Sleep Mode Test Circuit (tPZH, (tPSH), tPHZ)
DS012053-11 DS012053-8
FIGURE Receiver
FIGURE TRI-STATE Sleep Mode Waveforms (tPZH, (tPSH), tPHZ)
DS012053-12
FIGURE Receiver Differential Propagation Delay Test Circuit
DS012053-9
FIGURE TRI-STATE Sleep Mode Test Circuit (tPZL, (tPSL), tPLZ)
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PrintDate=1997/03/11 PrintTime=14:31:24 5746 ds012053 Rev.
Proof
Parameter Measurement Information
(Continued)
DS012053-13
FIGURE Receiver Differential Propagation Delay Waveforms
DS012053-14
FIGURE Receiver TRI-STATE Sleep Mode Test Circuit
DS012053-15
FIGURE Receiver Enable Disable Waveforms (tPLZ, tPZL, (tPSL))
DS012053-16
FIGURE Receiver Enable Disable Waveforms (tPHZ, tPZH, (tPSH))
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PrintDate=1997/03/11 PrintTime=14:31:25 5746 ds012053 Rev.
Proof
Parameter Measurement Information
(Continued)
DS012053-19
FIGURE Entering Sleep Mode Conditions
Typical Application Information
DS012053-18
FIGURE Typical RS-485 Interface TABLE Device Descriptions Name Description Receiver Output: When (Receiver Enable) LOW, receiver enabled (ON), DO/RI DO*/RI* will HIGH. DO/RI DO*/RI* will LOW. Additionally will HIGH OPEN (Non-terminated) Inputs. Receiver Output Enable: When receiver output enabled. When HIGH, receiver output TRI-STATE (OFF). When HIGH LOW, device will enter low-current sleep mode after Driver Output Enable: When HIGH, driver outputs enabled. When LOW, driver outputs TRI-STATE (OFF). When HIGH LOW, device will enter low-current sleep mode after Driver Input: When (Driver Enable) HIGH, driver enabled, LOW, then DO/RI will DO*/RI* will HIGH. HIGH, then DO/RI HIGH DO*/RI* LOW. Ground Connection. Driver Output/Receiver Input, Pin. Driver Output/Receiver Input, Pin. Positive Power Supply Connection: Recommended operating range +4.75V +5.25V.
DO/RI DO*/RI*
Unit Load
unit load RS-485 receiver defined input current versus input voltage curve. gray shaded region defined operating range from +12V. border extending from +12V defined unit load. Likewise, bottom border extending from -0.8 also defined unit load (see Figure 19). RS-485 driver capable driving unit loads. This allows nodes single bus. Although sufficient many applications, sometimes desirable have even more nodes.
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PrintDate=1997/03/11 PrintTime=14:31:26 5746 ds012053 Rev.
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Unit Load
(Continued)
ample, aircraft that rows with seats would benefit from having nodes bus. This would allow signals transferred from each individual seat main station. Usually there less seats last aircraft near restrooms food storage area. This frees node main station. DS36C278, DS36C279, DS36C280 have unit load unit load (UL) options available. These devices will allow nodes nodes guaranteed over temperature depending upon which option selected. option available industrial temperature available commercial temperature. First, device bottom borders shown Figure scaled. Both reference points stay same. other reference points +12V +0.5 border -0.4 bottom border (see Figure 19). Second, device bottom borders shown Figure scaled also. Again, both reference points stay same. other reference points +12V +0.25 border -0.2 bottom border (see Figure 19). advantage devices increased number nodes bus. single master multi-slave type application where number slaves exceeds DS36C278/279/280 save cost extra devices like repeaters, extra media like cable, and/or extra components like resistors.
DS012053-20
FIGURE Input Current Input Voltage Operating Range DS36C279 DS36C280 have additional feature which offers more advantages. DS36C279 automatic sleep mode function power conscious applications. DS36C280 slew rate control conscious applications. Refer sleep mode slew rate control portion application information section corresponding datasheet more information these features.
Sleep Mode
DS36C279 features automatic shutdown mode that allows device save power when transmitting data. Since shutdown mode automatic, external components required. used little much application requires. more feature utilized, more power saves. sleep mode automatically entered when both driver receiver disabled. This occurs when both asserted logic asserted logic high. Once both pins asserted device will enter sleep mode typically DS36C279 guaranteed into sleep mode within after both pins asserted. device wakes (comes sleep mode) when either asserted logic high and/or asserted logic low. After device enters sleep mode will take longer device wake than does device enable from TRI-STATE. Refer datasheet specifications tPSL tPSH compare with tPZL tPZH timing differences. benefit DS36C279 definitely power savings. When active device maximum When sleep mode device maximum only which times less power than when active. when device active already very when sleep mode ultra low.
Book Extract
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PrintDate=1997/03/11 PrintTime=14:31:27 5746 ds012053 Rev.
Proof
Physical Dimensions
inches (millimeters)
8-Lead (0.150" Wide) Molded Small Outline Package, JEDEC Order Number DS36C279M DS36C279NS Package Number M08A
8-Lead (0.300" Wide) Molded Dual-In-Line Package Order Number DS36C279N DS36C279TN Package Number N08E
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PrintDate=1997/03/11 PrintTime=14:31:28 5746 ds012053 Rev.
Proof
DS36C279 Power EIA-RS-485 Transceiver with Sleep Mode
LIFE SUPPORT POLICY NATIONAL'S PRODUCTS AUTHORIZED CRITICAL COMPONENTS LIFE SUPPORT DEVICES SYSTEMS WITHOUT EXPRESS WRITTEN APPROVAL PRESIDENT NATIONAL SEMICONDUCTOR CORPORATION. used herein: critical component component life support Life support devices systems devices sysdevice system whose failure perform reatems which, intended surgical implant into sonably expected cause failure life support body, support sustain life, whose faildevice system, affect safety effectiveness. perform when properly used accordance with instructions provided labeling, reasonably expected result significant injury user.
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National does assume responsibility circuitry described, circuit patent licenses implied National reserves right time without notice change said circuitry specifications.
PrintDate=1997/03/11 PrintTime=14:31:28 5746 ds012053 Rev.
Proof
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