Home

maxim MAX481/MAX483/MAX485/MAX487 MAX491/MAX1487 Manual(1)

1. C 8 Plastic DIP B30 AX491MJD 55 C to 125 14 CERDIP MAX483MJA 55 C to 125 C 8 CERDIP we E 2 UE DIE MAX485CPA 0 C 70 8 Plastic DIP QOL 0 AX1487C D 0 C to 70 C Dice AX1487EPA 40 C to 85 C 8 Plastic DIP MAX485C D 0 C to 70 C Dice 7 5 TUNES 350 MAX485EPA 40 C to 85 C 8 Plastic DIP T T MAX485ESA 40 C to 85 C 8 SO MAX485MJA 55 C to 125 C 8 CERDIP Contact factory for dice specifications MAX487CPA 0 C 70 8 Plastic DIP MAX487CSA 0 C to 70 C 880 MAX487CUA 0 C to 70 C 8 MAX MAX487C D 0 C to 70 C ___ Chip Topographies MAX487EPA 40 C to 85 C 8 Plastic DIP MAXAB7ESA 40 C to 5 880 MAX481 MAX483 MAX485 MAX487 MAX1487 MAX487MJA 55 C to 125 C 8 CERDIP Vee MAX488CPA 0 C 70 8 Plastic DIP MAX488CSA 0 C 70 880 RO N C AX488CUA 0 C to 70 C 8 MAX AX488C D 0 C to 70 C RE 0 054 AX488EPA 40 C to 85 C 8 Plastic DIP B 1 372mm AX488ESA 40 C to 85 C 880 DE AX488MJA 55 C to 125 C 8 CERDIP DI A MAX489CPD 0 C to 70 C 14 Plastic DIP AX489CSD 0 C to 70 C 14 SO GND AX489C D 0 C to 70 C Dice 0 080 AX489EPD 40 C to 85 C 14 Plastic DIP 2 032mm AX489ESD 40 C to 85 C 14 SO AX489MJD 55 C to 125 C 14 CERDIP MAXIM 15 Z8tLXVW LG6PXVW Z8bPXVW GSPXVW ESPXVMW LSbPXVIN Low Power Slew Rate Limited RS 485 RS 422 T
2. E 20 90 150 ns CL1 CL2 100pF MAX490M MAX491M 20 90 200 tPLH tPHL Differential Figures 6 and 10 RpIFF 540 Receiver Skew Cu CL2 100pF 9 i Receiver Enable to Output Low 21 Figures 5 and 11 CRL 15pF 51 closed 20 50 ns Receiver Enable to Output High Figures 5 and 11 15pF S2 closed 20 50 ns Receiver Disable Time from Low 117 Figures 5 and 11 15pF 51 closed 20 50 ns Receiver Disable Time from High tHZ Figures 5 and 11 CRL 15pF S2 closed 20 50 ns Maximum Data Rate 2 5 Mbps Time to Shutdown tSHDN AX481 Note 5 50 200 600 ns MAKIM 3 Z8tLXVW LG6PXVW Z8bPXVW GSPXVW ESPXVMW LSbPXVIW MAX481 MAX483 MAX485 MAX48 7 MAX491 MAX1487 Low Power Slew Rate Limited RS 485 RS 422 Transceivers SWITCHING CHARACTERISTICS MAX481 MAX485 MAX490 MAX491 MAX1487 continued Vcc 5V 595 TA to Tmax unless otherwise noted Notes 1 2 PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Driver Enable from Shutdown to 2 Output High MAX481 tZH SHDN gures 7 and 9 100pF S2 closed 40 100 ns Driver Enable from Shutdown to tZL SHDN Figures 7 and 9 100pF S1 closed 40 100 ns Output Low MAX481 Receiver Enable from Shutdown igures 5 and 11 CL 15pF S2 closed to Output High MAX481 ZH SHDN A B oy ROO 310005 is Receiver Enable from Shutdown t igures 5 and 11 15pF 51 closed to Output
3. Low MAX481 ZL SHDN go A sca 300 1000 ns SWITCHING CHARACTERISTICS MAX483 MAX487 MAX488 MAX489 Vcc 5V 5 TA to Tmax unless otherwise noted Notes 1 2 PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS tPLH Figures 6 and 8 540 250 800 2000 Driver Input to Output pur ae 100pF 250 800 2000 ns Driver Output Skew to Output tSkEW Rude do oe c 100 800 ns Driver Rise or Fall Time tr tF PE c 250 2000 ns Driver Enable to Output High Figures 7 and 9 100pF S2 closed 250 2000 ns Driver Enable to Output Low tzL Figures 7 and 9 100pF 51 closed 250 2000 ns Driver Disable Time from Low 17 Figures 7 and 9 15pF 51 closed 300 3000 ns Driver Disable Time from High tHZ Figures 7 and 9 15pF S2 closed 300 3000 ns Receiver Input to Output Figures 6 and 10 ADIER 549 on 280 ns teH 2 100pF 250 2000 Figures and 10 Rpirr 540 vxo eoe ae Receiver Enable to Output Low tzL Figures 5 and 11 CRL 15pF 51 closed 20 50 ns Receiver Enable to Output High ZH Figures 5 and 11 15pF S2 closed 20 50 ns Receiver Disable Time from Low 17 Figures 5 and 11 15pF 51 closed 20 50 ns Receiver Disable Time from High HZ Figures 5 and 11 15pF S2
4. by 200mV RO will be high 3 3 RO IfA lt B by 200mV RO will be low 4 u u 3 RE Receiver Output Enable RO is enabled when RE is low RO is high impedance when RE is high Driver Output Enable The driver outputs Y and Z are enabled by bringing DE high They are high impedance when DE is low If 3 5 4 DE he driver outputs are enabled the parts function as line drivers While they are high impedance they function as line receivers if RE is low 4 6 3 5 5 DI Driver Input A low on DI forces output Y low and output Z high Similarly a high on DI forces output Y high and output Z low 5 7 4 6 6 7 GND Ground 5 7 9 Y oninverting Driver Output 6 8 10 Z nverting Driver Output 6 8 A oninverting Receiver Input and Noninverting Driver Output 8 2 12 A oninverting Receiver Input 7 1 B nverting Receiver Input and Inverting Driver Output 7 1 11 nverting Receiver Input 8 2 1 3 14 Vcc Positive Supply 4 75V lt Vcc lt 5 25V 1 819 N C o Connect not internally connected TOP VIEW MAXIM MAX481 MAX483 MAX485 MAX487 MAX1487 MAXIM MAX481 MAX483 MAX485 MAX487 MAX1487 NOTE PIN LABELS Y AND Z ON TIMING TEST AND WAVEFORM DIAGRAMS REFER TO PINS A AND B WHEN DE IS HIGH TYPICAL OPERATING CIRCUIT SHOWN WITH DIP SO PACKAGE Figure 1 MAX481 MAX483 MAX485 MAX487 MAX 1487 Pin Configuration and Typical Oper
5. 2S 76 M AX 490 19 0122 Rev 8 10 03 AVLAZXLA Low Power Slew Rate Limited RS 485 RS 422 Transceivers General Description The 81 MAX483 MAX485 87 91 and MAX1487 are low power transceivers for 5 485 and RS 422 communication Each part contains one driver and one receiver The MAX483 MAX487 MAX488 and MAX489 feature reduced slew rate drivers that minimize EMI and reduce reflections caused by improperly terminated cables thus allowing error free data transmission up to 250kbps The driver slew rates of the MAX481 MAX485 MAX490 91 and MAX1487 are not limited allowing them to transmit up to 2 5Mbps These transceivers draw between 120 and 500p4A of supply current when unloaded or fully loaded with disabled drivers Additionally the MAX481 83 MAX487 have a low current shutdown mode in which they consume only 0 1pA All parts operate from a single 5V supply Drivers are short circuit current limited and are protected against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into a high imped ance state The receiver input has a fail safe feature that guarantees a logic high output if the input is open circuit The 87 and MAX1487 feature quarter unit load receiver input impedance allowing up to 128 87 MAX1487 transceivers on the bus Full duplex communi cations are obtained using the MAX488 MAXA91 whil
6. 7 Low Power Slew Rate Limited RS 485 RS 422 Transceivers Typical Operating Characteristics continued Vcc 5V TA 25 C unless otherwise noted OUTPUT CURRENT vs OUTPUT CURRENT vs MAX481 MAX485 MAX490 MAX491 DRIVER OUTPUT LOW VOLTAGE DRIVER OUTPUT HIGH VOLTAGE SUPPLY CURRENT vs TEMPERATURE 140 5 120 z 120 100 a T m 80 60 2 60 e MAX485 DE 0 2 5 a MAX481 DE 40 E amp o 20 20 0 0 0 2 4 6 8 10 12 7 6 5 4 3 2 1 012345 50 25 0 25 50 75 100 125 OUTPUT LOW VOLTAGE V OUTPUT HIGH VOLTAGE V TEMPERATURE C MAX1487 MAX483 MAX487 MAX489 SUPPLY vs TEMPERATURE SUPPLY CURRENT vs TEMPERATURE MAX481 12 MAX481 13 MAX483 DE MAX487 DE Vcc MAX483 MAX487 D MAX488 MAX489 D MAX483 MAX487 DE 0 RE SUPPLY CURRENT uA SUFFLY LUKKENI UA MAX1487 50 95 0 25 50 75 100 125 60 40 20 0 20 40 60 80 100120 140 TEMPERATURE 2 TEMPERATURE C 6 MAKIM Low Power Slew Rate Limited RS 485 RS 422 Transceivers Pin Description PIN MAX481 MAX483 MAX485 MAX487 spe peed eas NAME FUNCTION MAX1487 DIP SO pMAX DIP SO MAX DIP SO Receiver Output If A gt
7. F FULL DUPLEX DATA RATE Mbps SLEW RATE LIMITED LOW POWER SHUTDOWN RECEIVER DRIVER ENABLE QUIESCENT CURRENT uA NUMBER OF TRANSMITTERS ON BUS MAX481 2 5 300 32 MAX483 0 25 120 32 MAX485 2 5 300 32 MAX487 120 128 88 120 32 89 120 32 MAX490 300 32 MAX491 300 32 MAX1487 AWLAXLA 230 128 Maxim Integrated Products 1 For pricing delivery and ordering information please contact Maxim Dallas Direct at 1 888 629 4642 or visit Maxim s website at www maxim ic com Z8btLXVMW L6PXVW Z8bPXVW SSPXVW ESPXVMW L8SbPXVIN MAX481 MAX483 MAX485 MAX48 7 MAX491 MAX1487 Low Power Slew Rate Limited RS 485 RS 422 Transceivers ABSOLUTE MAXIMUM RATINGS Supply Voltage VCcC Control Input Voltage RE DE Driver Input Voltage DI Receiver Input Voltage A B Receiver Output Voltage RO 0 5V to Vcc 0 5V Continuous Power Dissipation TA 70 C 8 Pin Plastic DIP derate 9 09mW C above 70 C 727mW 14 Pin Plastic DIP derate 10 00mW C above 70 C 800mW 8 Pin SO derate 5 88mW C above 70 C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device These are stress ratings only and functional operation of the device at these or any other conditions beyond those ind
8. GH Vo VDIFF gy i 90 90 23V Vp te t2H SHDN tskew tpHL Figure 8 Driver Propagation Delays Figure 9 Driver Enable and Disable Times except MAX488 and MAX490 21 tz tL output 15 1 5V QUTPUT NORMALLY LOW VoL 0 5V LA 5V OUTPUT NORMALLY HIGH tZH SHDN Figure 10 Receiver Propagation Delays Figure 11 Receiver Enable and Disable Times except MAX488 and MAX490 Function Tables MAX481 MAX483 MAX485 MAX487 MAX1487 Table 1 Transmitting Table 2 Receiving INPUTS OUTPUTS INPUTS OUTPUT RE DE DI 7 Y RE DE A B RO X 1 1 0 1 0 0 gt 0 2V 1 X 1 0 1 0 0 0 lt 0 2V 0 0 0 x High Z High Z 0 0 Inputs open 1 1 0 X High Z High Z 1 0 X High Z X Don t care X Don t care High Z High impedance High Z High impedance Shutdown mode for MAX481 MAX483 MAX487 Shutdown mode for MAX481 MAX483 MAX487 10 MAKIM Low Power Slew Rate Limited RS 485 RS 422 Transceivers 10dB div 500kHz div Figure 12 Driver Output Waveform and FFT Plot of MAX481 MAX485 MAX490 MAX49 1 MAX1487 Transmitting 150kHz Signal Low Power Shutdown Mode MAX481 MAX483 MAX487 A low power shutdown mode is initiated by bringing both RE high and DE low The devices will not shut down unless both the driver and receiver are disabled In shutdown t
9. ating Circuit MAXIM 7 Z8bPLXVW LG6PXVW Z8bPXVW SSPXVW ESPXVMW LSbPXVIN MAX481 MAX483 MAX485 MAX48 7 MAX491 MAX1487 Low Power Slew Rate Limited RS 485 RS 422 Transceivers TOP VIEW Vcc MAXIM MAX488 MAX490 DIP SO MAXIM MAX488 MAX490 NOTE TYPICAL OPERATING CIRCUIT SHOWN WITH DIP SO PACKAGE MAXIM MAX489 MAX491 Figure 3 MAX489 MAX491 Pin Configuration and Typical Operating Circuit Applications Information The MAX481 MAX483 MAX485 MAX487 MAX491 and MAX1487 are low power transceivers for RS 485 and RS 422 communications The MAX481 MAX485 MAX490 MAX491 and MAX1487 can transmit and receive at data rates up to 2 5Mbps while the MAX483 MAX487 MAX488 and MAX489 are specified for data rates up to 250kbps The MAX488 MAX491 are full duplex trans ceivers while the MAX481 MAX483 MAX485 87 and MAX1487 are half duplex In addition Driver Enable DE and Receiver Enable RE pins are included on the MAX481 MAX483 MAX485 MAX487 MAX489 MAX491 and MAX1487 When disabled the driver and receiver outputs are high impedance MAX487 MAX1487 128 Transceivers on the Bus The 48kQ 1 unit load receiver input impedance of the MAX487 and MAX1487 allows up to 128 transceivers a bus compared to the 1 unit load 12 input impedance of standard RS 485 drivers 32 trans ceivers maximum Any combination of MAX487 MAX1487 and other RS 485 transceivers with a total of 32
10. closed 20 50 ns Maximum Data Rate PLH tPHL 50 of data period 250 kbps Time to Shutdown SHD 8 87 Note 5 50 200 600 ns Driver Enab e from Shutdown to IZH SHDN 483 AX487 Figures 7 and 9 2000 m Output High 100pF S2 closed Driver Enable from Shutdown to tZL SHDN 83 87 Figures 7 and 9 2000 Output Low 100pF 51 closed Receiver Enable from Shutdown 1ZH SHDN MAX483 MAX487 Figures 5 and 11 2500 to Output High 15pF S2 closed Receiver Enable from Shutdown tZL SHDN MAXA83 MAXABT Figures 5 and 11 2500 n to Output Low 15pF S1 closed 4 MAKIM Low Power Slew Rate Limited RS 485 RS 422 Transceivers NOTES FOR ELECTRICAL SWITCHING CHARACTERISTICS Note 1 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 2 All typical specifications are given for Vcc 5V and TA 25 Note 3 Supply current specification is valid for loaded transmitters when DE OV Note 4 Applies to peak current See Typical Operating Characteristics Note 5 The MAX481 MAX483 MAX487 are put into shutdown by bringing RE high and DE low If the inputs are in this state for less than 50ns the parts are guaranteed not to enter shutdown If the inputs are in this state for at least 600ns the parts are guaranteed to have entered shutdown See Low Power S
11. e the MAX481 MAX483 MAX485 MAX487 and MAX1487 are designed for half duplex applications Applications Low Power RS 485 Transceivers Low Power RS 422 Transceivers Level Translators Transceivers for EMI Sensitive Applications Industrial Control Local Area Networks Next Generation Device Features For Fault Tolerant Applications MAX3430 80V Fault Protected Fail Safe 1 4 Unit Load 3 3V RS 485 Transceiver MAX3440E MAX3444E x15kV ESD Protected 60V Fault Protected 10Mbps Fail Safe RS 485 J1708 Transceivers For Space Constrained Applications MAX3460 MAX3464 5V Fail Safe 20Mbps Profibus RS 485 RS 422 Transceivers MAX3362 3 3V High Speed RS 485 RS 422 Transceiver in a SOT23 Package 280 284 x15kV ESD Protected 52Mbps 3V 5 5V SOT23 RS 485 RS 422 True Fail Safe Receivers MAX3293 MAX3294 MAX3295 20Mbps 3 3V SOT23 RS 855 RS 422 Transmitters For Multiple Transceiver Applications 15 ESD Protected 3 3V Quad RS 422 Transmitters For Fail Safe Applications MAX3080 MAX3089 Fail Safe High Speed 10Mbps Slew Rate Limited RS 485 RS 422 Transceivers For Low Voltage Applications MAX3483E MAX3485E MAX3486E MAX3488E MAX3490E MAX3491E 3 3V Powered 15kV ESD Protected 12Mbps Slew Rate Limited True RS 485 RS 422 Transceivers Ordering Information appears at end of data sheet Selection Table PART NUMBER HAL
12. ecifications For the latest package outline information go to www maxim ic com packages PDIPN EPS u 34 54135 05 D amp E DO NOT INCLUDE MOLD FLASH MOLD FLASH OR PROTRUSIONS NOT 0 100 BSC 2 54 BSC TO EXCEED 15mm 00062 CONTROLLING DIMENSION MILLIMETER eA 0 300 BSC 762 BSC MEETS JEDEC 5001 AS SHOWN eB 0 400 BSC 1016 BSC IN ABOVE TABLE L 0115 0150 2 921 3 81 22227212 PACKAGE FAMILY OUTLINE PDIP 300 17 21 0043 D LE I SUWIYVALE 9406 DOCUMENT CONTROL NUMBER REV LJ PROPRIETARY INFORMATION Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product No circuit patent licenses are implied Maxim reserves the right to change the circuitry and specifications without notice at any time Maxim Integrated Products 120 San Gabriel Drive Sunnyvale CA 94086 408 737 7600 19 2003 Maxim Integrated Products Printed USA MAAXIAA is a registered trademark of Maxim Integrated Products L6PXVW Z8PXVW S8SPXVW ESPXVW L8PXVIN
13. ementary Output States Input High Voltage DE DI RE 2 0 V Input Low Voltage VIL DE DI RE 0 8 V Input Current DE DI RE 2 uA DE OV Vcc OV or 5 25 19 x Input Current all devices except E MAX487 MAX1487 MINSAN i MAX487 MAX1487 VIN 12V 0 25 DE OV Vcc OV or 5 25V ViN 7V 0 2 Receiver Differential Threshold Voltage VTH 7V 12V 0 2 0 2 V Receiver Input Hysteresis AVTH Vom OV 70 mV Receiver Output High Voltage lo AmA 200mV 3 5 V Receiver Output Low Voltage VOL lo 4mA 200mV 0 4 V Three State high impedance Output Current at Receiver lozR aliai EAN pA 7V 12V all devices except 12 ko MAX487 MAX1487 Receiver Input Resistance RIN 7V 12V MAX487 MAX1487 48 kQ 2 MAXIM Low Power Slew Rate Limited RS 485 RS 422 Transceivers DC ELECTRICAL CHARACTERISTICS continued Vcc 5V 5 TA to Tmax unless otherwise noted Notes 1 2 PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS MAX488 MAX489 DE DI RE OV or Vcc 0 e30 MAX490 MAX491 DE DI RE OV or Vcc RUD 209 MAX481 MAX485 DE Vcc 500 900 No Load Supply Current BE Note 3 lcc RE OV or Vcc DE OV 300 500 JA MAX1487 DE Vcc 300 500 RE OV or Vcc DE OV 230 400 MAX483 MAX487 Se eee se 690 i MAX487 250 400 OV Vcc DE OV 120 250 Su
14. gths greater than 4000 feet see Figure 23 Figures 19 and 20 show the system differential voltage for the parts driving 4000 feet of 26AWG twisted pair wire at 110kHz into 120 loads Typical Applications The MAX481 MAX483 MAX485 MAX487 MAX491 and MAX1487 transceivers are designed for bidirectional data communications on multipoint bus transmission lines 2us div Figure 19 MAX481 MAX485 MAX490 MAX491 MAX1487 System Differential Voltage at 110kHz Driving 4000ft of Cable Figures 21 and 22 show typical network applications Circuits These parts can also be used as line repeaters with cable lengths longer than 4000 feet as shown in Figure 23 To minimize reflections the line should be terminated at both ends in its characteristic impedance and stub lengths off the main line should be kept as short as possi ble The slew rate limited MAX483 and 87 89 are more tolerant of imperfect termination 2us div Figure 20 MAX483 MAX487 MAX489 System Differential Voltage at 110kHz Driving 4000ft of Cable MAXUM MAX481 MAX483 MAX485 MAX487 MAX1487 Figure 21 MAX481 MAX483 MAX485 MAX487 MAX 1487 Typical Half Duplex RS 485 Network MAKIM 13 Z8btLXVW LG6PXVW Z8bPXVW SSPXVW ESPXVMW LSbPXVIN MAX481 MAX483 MAX485 MAX48 7 MAX491 MAX1487 Low Power Slew Rate Limited RS 485 RS 422 Transceivers MAXUM 89 MAX491 NOTE RE AND DE ON MAX489 MAX491 ONLY Figu
15. he devices typically draw only 1 of supply current RE and DE may be driven simultaneously the parts are guaranteed not to enter shutdown if RE is high and DE is low for less than 50ns If the inputs are in this state for at least 600ns the parts are guaranteed to enter shutdown For the MAX481 83 and 87 the tzH and tzL enable times assume the part was not in the low power shutdown state the MAX485 MAX488 MAX491 and MAX1487 can not be shut down The tZH SHDN and tZL SHDN enable times assume the parts were shut down see Electrical Characteristics It takes the drivers and receivers longer to become enabled from the low power shutdown state tZH SHDN tZL SHDN than from the operating mode tzH 121 The parts are in operating mode if the DE inputs equal a logical 0 1 or 1 1 or O 0 MAKIM 10dB div 500kHz div Figure 13 Driver Output Waveform and FFT Plot of MAX483 MAX487 MAX489 Transmitting 150kHz Signal Driver Output Protection Excessive output current and power dissipation caused by faults or by bus contention are prevented by two mechanisms A foldback current limit on the output stage provides immediate protection against short cir cuits over the whole common mode voltage range see Typical Operating Characteristics In addition a ther mal shutdown circuit forces the driver outputs into a high impedance state if the die temperature rises excessively Propagation Dela
16. hutdown Mode section _ ee Typical Operating Characteristics Vcc 5V TA 25 C unless otherwise noted OUTPUT CURRENT vs OUTPUT CURRENT vs RECEIVER OUTPUT HIGH VOLTAGE vs RECEIVER OUTPUT LOW VOLTAGE RECEIVER OUTPUT HIGH VOLTAGE TEMPERATURE 45 gt 20 4 8 40 18 2 46 8mA 35 44 14 30 42 g c 25 Ru gt 40 20 o 38 Lr Eg a E E 15 E a 36 5 10 4 34 5 2 3 2 0 0 3 0 0 05 10 15 20 25 15 20 25 30 35 40 45 50 50 25 0 25 50 75 100 125 OUTPUT LOW VOLTAGE V OUTPUT HIGH VOLTAGE V TEMPERATURE C RECEIVER OUTPUT LOW VOLTAGE vs DRIVER OUTPUT CURRENT vs DRIVER DIFFERENTIAL OUTPUT VOLTAGE TEMPERATURE DIFFERENTIAL OUTPUT VOLTAGE vs TEMPERATURE 0 9 90 F 24 0 8 IRo 80 2 S23 R 540 2 07 70 m 22 21 amp 06 60 21 S 05 50 g 20 8 19 40 5 2 0 3 amp 30 18 5 3 8 02 20 17 LL 0 1 10 amp 16 0 0 15 50 25 0 25 50 75 100 125 0 05 10 15 20 25 30 35 40 45 50 25 0 25 50 75 100 125 TEMPERATURE C DIFFERENTIAL OUTPUT VOLTAGE V TEMPERATURE C MAKIM 5 Z8tLXVW L6PXVW Z8bPXVW GSPXVW ESPXVMW LSbPXVIN MAX481 MAX483 MAX485 MAX48 7 MAX491 MAX148
17. icated in the operational sections of the specifications is not implied Exposure to absolute maximum rating conditions for extended periods may affect device reliability DC ELECTRICAL CHARACTERISTICS Vcc 5V 5 TA to Tmax unless otherwise noted Notes 1 2 0 5V to Vcc 0 5V 0 5V to Vcc 0 5V Driver Output Voltage 8V to 12 5V 8 Pin C 14 Pin SO derate 8 33mW C above 70 8 Pin UMAX derate 4 1mW C above 70 C ERDIP derate 8 00mW C above 70 C 14 Pin CERDIP derate 9 09mW C above 70 C Operating Temperature Ranges 87 A E MAX1487E MAX1487MJA Storage Temperature Range Lead Temperature soldering 10sec 0 C to 70 C 40 C to 85 C 55 C to 125 C 65 C to 160 C PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Differential Driver Output no load VOD1 5 V Differential Driver Output 500 RS 422 2 2 with load 270 RS 485 Figure 4 1 5 5 Change in Magnitude of Driver Differential Output Voltage for AVOD 270 or 500 Figure 4 0 2 V Complementary Output States Driver Common Mode Output _ Voltage Voc R 27Q or 50Q Figure 4 3 V Change in Magnitude of Driver Common Mode Output Voltage AVOD R 270 or 500 Figure 4 0 2 V for Compl
18. nformation continued The package drawing s in this data sheet may not reflect the most current specifications For the latest package outline information go to www maxim ic com packages 2 8 8 INCHES MILLIMETERS LE I I DIM MIN MAX MIN MAX A 0 043 110 A1 0 002 0 006 0 05 0 15 A2 0 030 0 037 0 75 0 95 b 0 010 0 014 0 25 0 36 m 0 50 0 1 0 005 0 007 0 13 0 18 0 116 0 120 2 95 3 05 0 6 0 1 0 0256 BSC 0 65 BSC e E 0 116 0 120 2 95 3 05 H 0 188 0 198 4 78 5 03 L 0 016 0 026 0 41 0 66 0 6 0 1 1 02 Ovo 6 0 6 S 0 0207 BSC 0 5250 BSC BOTTOM VIEW HEREDI igen FRONT VIEW SIDE VIEW NOTES DDALLAS MVLAXL VI 1 D amp E DO NOT INCLUDE MOLD FLASH CESGERIe UN 2 MOLD FLASH OR PROTRUSIONS NOT TO EXCEED 0 15MM 006 3 CONTROLLING DIMENSION MILLIMETERS PACKAGE OUTLINE 8L uMAX uSOP 4 MEETS JEDEC MO 187C AA APPROVAL DOCUMENT CONTROL NO REV 4 21 0036 J 71 18 MAKIM MAX481 MAX483 MAX485 MAX48 7 MAX491 MAX1487 Low Power Slew Rate Limited RS 485 RS 422 Transceivers Package Information continued The package drawing s in this data sheet may not reflect the most current sp
19. pply Current in Shutdown ISHDN MAX481 483 487 DE OV RE Vcc 0 1 10 UA Driver Short Circuit Current Vo High losp1 7V 12V Note 4 35 250 mA Driver Short Circuit Current Vo Low losp2 7V lt 12 Note 4 35 250 mA Receiver Short Circuit Current lOSR OV 7 95 SWITCHING CHARACTERISTICS MAX481 MAX485 MAX490 MAX491 MAX1487 Vcc 5V 5 TA to Tmax unless otherwise noted Notes 1 2 PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS tPLH Figures 6 and 8 RDIFF 540 10 30 60 Driver Input to Output iet Cio 100pF 10 30 60 ns Driver Output Skew to Output tSKEW Figures 6 and 8 RpiFr 540 Cj 1 100pF 5 10 ns Figures 6 8 MAX481 MAX485 MAX1487 15 40 Driver Rise or Fall Time tR tF 540 MAX490C E MAX491C E 5 15 25 ns CL1 CL2 100pF MAX490M MAX491M 3 15 40 Driver Enable to Output High Figures 7 and 9 100pF S2 closed 40 70 ns Driver Enable to Output Low tzL Figures 7 and 9 100pF S1 closed 40 70 ns Driver Disable Time from Low 17 Figures 7 and 9 15pF 51 closed 40 70 ns Driver Disable Time from High tHZ Figures 7 and 9 CL 15pF S2 closed 40 70 ns Figures 6 and 10 MAX481 MAX485 MAX1487 20 90 200 Receiver Input to Output tPLH tPHL RDIFF 540 MAX490C E MAX491C
20. ransceivers Chip Topographies continued MAX488 MAX490 MAX489 MAX491 RO RO A 7 B N C i 0 054 005 Z 1 372mm X 1 372mm DE GND GND 0 080 0 080 2 032mm 2 032mm TRANSISTOR COUNT 248 SUBSTRATE CONNECTED TO GND MAX481 MAX483 MAX485 MAX48 7 MAX491 MAX1487 16 MAKIM Low Power Slew Rate Limited RS 485 RS 422 Transceivers Package Information The package drawing s in this data sheet may not reflect the most current specifications For the latest package outline information go to www maxim ic com packages INCHES MILLIMETERS SOICN EPS VARIATIONS MILLIMETERS TOP VIEW po oes over aso soo t A p osor ass M AB e E FRONT VIEW SIDE VIEW NOTES D amp E DO NOT INCLUDE MOLD FLASH MOLD FLASH OR PROTRUSIONS NOT TO EXCEED 0 15mm 006 BDALLAS AVLAXL VI LEADS TO BE COPLANAR WITHIN 0 10mm 004 PROPRIETARY INFORMATION CONTROLLING DIMENSION MILLIMETERS MEETS JEDEC 5012 PACKAGE OUTLINE 150 SOIC NUMBER OF PINS APPROVAL DOCUMENT CONTROL NO 21 0041 REV B MAKIM 17 Z8tLXVW L6PXVW Z8bPXVW GSSPXVW ESPXVMW L8SbPXVIN MAX481 MAX483 MAX485 MAX48 7 MAX491 MAX1487 Low Power Slew Rate Limited RS 485 RS 422 Transceivers Package I
21. re 22 MAX488 MAX491 Full Duplex RS 485 Network Isolated RS 485 VLAXI VI For isolated RS 485 applications see the MAX253 and MAX488 MAX491 MAX1480 data sheets 28 DATA IN V 09 DATA OUT NOTE RE AND DE ON MAX489 MAX491 ONLY Figure 23 Line Repeater for MAX488 MAX491 14 MAKIM Low Power Slew Rate Limited RS 485 RS 422 Transceivers Ordering Information Ordering Information continued PART TEMP RANGE PIN PACKAGE PART TEMP RANGE PIN PACKAGE MAX481CPA 0 C to 70 C 8 Plastic DIP MAX490CPA 0 C to 70 C 8 Plastic DIP AX481CSA 0 C to 70 C 880 AX490CSA 0 C to 70 8SO AX481CUA 0 C to 70 C 8 uMAX AX490CUA 0 C to 70 C 8 uMAX AX481C D 0 C to 70 C Dice AX490C D 0 C to 70 C Dice AX481EPA 40 C to 85 C 8 Plastic DIP AX490EPA 40 C to 85 C 8 Plastic DIP AXAB TESA A0Cio485C 880 AX490ESA 40 C to 85 C 850 MAX481MJA 55 C to 4125 C 8 CERDIP AX490MJA 55 C to 125 C 8 CERDIP MAX483CPA OC to 470 C 8 Plastic DIP MAX491CPD 0 C to 70 C 14 Plastic DIP AXABSCSA OCC e30 AX491CSD 0 C to 70 14 SO AXABSCUA 0 C to 470 C 8 UMAX AX491C D 0 C to 70 C Dice AX483C D 0 C to 470 C Dice AX491 EPD 40 C to 85 14 Plastic DIP MAX483EPA 40 C to 85
22. unit loads or less can be put on the bus The MAX481 MAX483 MAX485 488 491 have standard 12kQ Receiver Input impedance MAKI M Low Power Slew Rate Limited RS 485 RS 422 Transceivers Figure 4 Driver DC Test Load Figure 6 Driver Receiver Timing Test Circuit MAX483 MAX487 MAX488 MAX489 Reduced EMI and Reflections The MAX483 and 87 89 are slew rate limit ed minimizing EMI and reducing reflections caused by improperly terminated cables Figure 12 shows the dri ver output waveform and its Fourier analysis of a 150kHz signal transmitted by a MAX481 MAX485 MAX490 MAX491 MAX1487 High frequency har Test Circuits RECEIVER TEST POINT OUTPUT Figure 5 Heceiver Timing Test Load OUTPUT UNDER TEST Figure 7 Driver Timing Test Load monics with large amplitudes are evident Figure 13 shows the same information displayed for a MAXA83 MAX487 MAX488 or MAX489 transmitting under the same conditions Figure 13 s high frequency harmonics have much lower amplitudes and the potential for EMI is significantly reduced Z8tLXVW LG6PXVW Z8bPXVW GSSPXVW ESPXVMW LSbPXVIN MAX481 MAX483 MAX485 MAX48 7 MAX491 MAX1487 Low Power Slew Rate Limited RS 485 RS 422 Transceivers Switching Waveforms 1 5V lt lt 1 2 Vo 71 SHDN tz t 23V OUTPUT NORMALLY LOW Vor 40 5V 1 2 Vo Vpre V Y V 2 OUTPUT NORMALLY HI
23. y Many digital encoding schemes depend on the differ ence between the driver and receiver propagation delay times Typical propagation delays are shown in Figures 15 18 using Figure 14 s test circuit The difference in receiver delay times tPLH is typically under 13ns for the MAX481 MAXA85 90 MAX491 MAX1487 and is typically less than 100ns for the MAX483 and MAX487 MAXA89 The driver skew times are typically 5ns 10ns max for the MAX481 MAX485 MAX490 MAX491 and MAX1487 and are typically 100ns 800ns max for the MAX483 and 487 89 11 Z8tLXVW L6PXVW Z8bPXVW SSPXVW ESPXVMW LSbPXVIN MAX481 MAX483 MAX485 MAX48 7 MAX491 MAX1487 Low Power Slew Rate Limited RS 485 RS 422 Transceivers RECEIVER tg tr lt 6ns Figure 14 Receiver Propagation Delay Test Circuit E fa BE Vec 5V 500mV div Ta 425 C 500mV div 4 Emm RO 2V div 2V div RO 20ns div 20ns div Figure 15 MAX481 MAX485 MAX490 MAX49 1 MAX 1487 Figure 16 MAX481 MAX485 MAX490 MAX49 1 MAX 1487 Receiver tPHL Receiver tPLH B 500mV div tj 500mV div A RO 2V div 2V div RO iJ 400ns div 400ns div Figure 17 MAX483 MAX487 MAX489 Receiver tPHL Figure 18 MAX483 MAX487 MAX489 Receiver tPLH 12 MAKIM Low Power Slew Rate Limited RS 485 RS 422 Transceivers Line Length vs Data Rate The RS 485 RS 422 standard covers line lengths up to 4000 feet For line len

maxim MAX481/MAX483/MAX485/MAX487 MAX491/MAX1487 Manual(1)

Contents

Download Pdf Manuals

Related Search

Related Contents