MAX481/MAX483/MAX485/MAX487–MAX491/MAX1487Low-Power, Slew-Rate-LimitedRS-485/RS-422 TransceiversABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC).............................................................12VControl Input Voltage (RE, DE)...................-0.5V to (VCC+ 0.5V)Driver Input Voltage (DI).............................-0.5V to (VCC+ 0.5V)Driver Output Voltage (A, B)...................................-8V to +12.5VReceiver Input Voltage (A, B).................................-8V to +12.5VReceiver 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)....727mW14-Pin Plastic DIP (derate 10.00mW/°C above +70°C)..800mW8-Pin SO (derate 5.88mW/°C above +70°C).................471mW
14-Pin SO (derate 8.33mW/°C above +70°C)...............667mW8-Pin μMAX (derate 4.1mW/°C above +70°C)..............830mW8-Pin CERDIP (derate 8.00mW/°C above +70°C).........640mW14-Pin CERDIP (derate 9.09mW/°C above +70°C).......727mWOperating Temperature Ranges
MAX4_ _C_ _/MAX1487C_ A...............................0°C to +70°CMAX4__E_ _/MAX1487E_ A.............................-40°C to +85°CMAX4__M_/MAX1487MJA.............................-55°C to +125°CStorage Temperature Range.............................-65°C to +160°CLead Temperature (soldering, 10sec).............................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functionaloperation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure toabsolute maximum rating conditions for extended periods may affect device reliability.DC ELECTRICAL CHARACTERISTICS
(VCC= 5V ±5%, TA= TMINto TMAX, unless otherwise noted.) (Notes 1, 2)
PARAMETER
Differential Driver Output (no load)Differential Driver Output(with load)
Change in Magnitude of DriverDifferential Output Voltage forComplementary Output StatesDriver Common-Mode OutputVoltage
Change in Magnitude of DriverCommon-Mode Output Voltagefor Complementary Output StatesInput High VoltageInput Low VoltageInput Current
SYMBOLVOD1VOD2ΔVODVOCΔVODVIHVILIIN1
R = 50Ω(RS-422)
R = 27Ω(RS-485), Figure 4R = 27Ωor 50Ω, Figure 4R = 27Ωor 50Ω, Figure 4R = 27Ωor 50Ω, Figure 4DE, DI, REDE, DI, REDE, DI, REDE = 0V;
VCC= 0V or 5.25V,all devices exceptMAX487/MAX1487
MAX487/MAX1487,
DE = 0V, VCC= 0V or 5.25V
Receiver Differential ThresholdVoltage
Receiver Input HysteresisReceiver Output High VoltageReceiver Output Low VoltageThree-State (high impedance)Output Current at Receiver
VTHΔVTHVOHVOLIOZR
-7V ≤VCM≤12VVCM= 0V
IO= -4mA, VID= 200mVIO = 4mA, VID= -200mV0.4V ≤VO≤2.4V
-7V ≤VCM≤12V, all devices exceptMAX487/MAX1487
-7V ≤VCM ≤12V, MAX487/MAX1487
12483.5
0.4±1
VIN= 12VVIN= -7VVIN= 12VVIN= -7V
-0.2
70
2.0
0.8±21.0
mA
-0.80.25-0.20.2
mAVmVVVμAkΩkΩ
21.5
50.230.2
CONDITIONS
MIN
TYP
MAX5
UNITSVVVVVVVμA
Input Current(A, B)
IIN2
Receiver Input ResistanceRIN
2
MAX481/MAX483/MAX485/MAX487–MAX491/MAX1487Low-Power, Slew-Rate-LimitedRS-485/RS-422 TransceiversGeneral DescriptionThe MAX481, MAX483, MAX485, MAX487–MAX491, andMAX1487 are low-power transceivers for RS-485 and RS-422 communication. Each part contains one driver and onereceiver. The MAX483, MAX487, MAX488, and MAX489feature reduced slew-rate drivers that minimize EMI andreduce reflections caused by improperly terminated cables,thus allowing error-free data transmission up to 250kbps.The driver slew rates of the MAX481, MAX485, MAX490,MAX491, and MAX1487 are not limited, allowing them totransmit up to 2.5Mbps.
These transceivers draw between 120μA and 500μA ofsupply current when unloaded or fully loaded with disableddrivers. Additionally, the MAX481, MAX483, and MAX487have a low-current shutdown mode in which they consumeonly 0.1μA. All parts operate from a single 5V supply.
Drivers are short-circuit current limited and are protectedagainst excessive power dissipation by thermal shutdowncircuitry that places the driver outputs into a high-imped-ance state. The receiver input has a fail-safe feature thatguarantees a logic-high output if the input is open circuit.The MAX487 and MAX1487 feature quarter-unit-loadreceiver input impedance, allowing up to 128 MAX487/MAX1487 transceivers on the bus. Full-duplex communi-cations are obtained using the MAX488–MAX491, whilethe MAX481, MAX483, MAX485, MAX487, and MAX1487are designed for half-duplex applications.
__Next Generation Device FeaturesoFor Fault-Tolerant Applications
MAX3430: ±80V Fault-Protected, Fail-Safe, 1/4Unit Load, +3.3V, RS-485 Transceiver
MAX3440E–MAX3444E: ±15kV ESD-Protected,±60V Fault-Protected, 10Mbps, Fail-Safe, RS-485/J1708 Transceivers
oFor Space-Constrained Applications
MAX3460–MAX3464: +5V, Fail-Safe, 20Mbps,Profibus RS-485/RS-422 Transceivers
MAX3362: +3.3V, High-Speed, RS-485/RS-422Transceiver in a SOT23 Package
MAX3280E–MAX3284E: ±15kV ESD-Protected,52Mbps, +3V to +5.5V, SOT23, RS-485/RS-422,True Fail-Safe Receivers
MAX3293/MAX3294/MAX3295: 20Mbps, +3.3V,SOT23, RS-485/RS-422 TransmittersoFor Multiple Transceiver Applications
MAX3030E–MAX3033E: ±15kV ESD-Protected,+3.3V, Quad RS-422 TransmittersoFor Fail-Safe Applications
MAX3080–MAX3089: Fail-Safe, High-Speed(10Mbps), Slew-Rate-Limited RS-485/RS-422Transceivers
oFor Low-Voltage Applications
MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E: +3.3V Powered, ±15kVESD-Protected, 12Mbps, Slew-Rate-Limited,True RS-485/RS-422 Transceivers
Ordering Information appears at end of data sheet.________________________ApplicationsLow-Power RS-485 TransceiversLow-Power RS-422 TransceiversLevel Translators
Transceivers for EMI-Sensitive ApplicationsIndustrial-Control Local Area Networks
______________________________________________________________Selection TablePART NUMBER MAX481 MAX483 MAX485 MAX487 MAX488 MAX489 MAX490 MAX491 MAX1487
HALF/FULL DUPLEX
HalfHalfHalfHalfFullFullFullFullHalf
DATA RATE (Mbps) 2.50.252.50.250.250.252.52.52.5
SLEW-RATE LIMITED
NoYesNoYesYesYesNoNoNo
LOW-RECEIVER/QUIESCENT NUMBER OF
POWER DRIVER CURRENT RECEIVERS ON SHUTDOWN ENABLE (μA) BUS
YesYesNoYesNoNoNoNoNo
YesYesYesYesNoYesNoYesYes
300120300120120120300300230
32323212832323232128
PIN
COUNT 88888148148
19-0122; Rev 10; 9/14
MEMORY存储芯片MAX485EPA中文规格书 - 图文
