MEMORY存储芯片MAX1487EPA+中文规格书-USB迷|专注于互联网分享

2024年2月25日发(作者：汗虹颖)

找MEMORY、二三极管上美光存储General 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 driver slew rates of the MAX481, MAX485, MAX490,MAX491, and MAX1487 are not limited, allowing them totransmit up to 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 s 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 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 ApplicationsMAX3430: ±80V Fault-Protected, Fail-Safe, 1/4Unit Load, +3.3V, RS-485 TransceiverMAX3440E–MAX3444E: ±15kV ESD-Protected,±60V Fault-Protected, 10Mbps, Fail-Safe,

RS-485/J1708 TransceiversoFor Space-Constrained ApplicationsMAX3460–MAX3464: +5V, Fail-Safe, 20Mbps,Profibus RS-485/RS-422 TransceiversMAX3362: +3.3V, High-Speed, RS-485/RS-422Transceiver in a SOT23 PackageMAX3280E–MAX3284E: ±15kV ESD-Protected,52Mbps, +3V to +5.5V, SOT23, RS-485/RS-422,True Fail-Safe ReceiversMAX3293/MAX3294/MAX3295: 20Mbps, +3.3V,SOT23, RS-485/RS-422 TransmittersoFor Multiple Transceiver ApplicationsMAX3030E–MAX3033E: ±15kV ESD-Protected,+3.3V, Quad RS-422 TransmittersoFor Fail-Safe ApplicationsMAX3080–MAX3089: Fail-Safe, High-Speed(10Mbps), Slew-Rate-Limited RS-485/RS-422TransceiversoFor Low-Voltage ApplicationsMAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E: +3.3V Powered, ±15kVESD-Protected, 12Mbps, Slew-Rate-Limited,True RS-485/RS-422 TransceiversOrdering Information appears at end of data sheet.________________________ApplicationsLow-Power RS-485 TransceiversLow-Power RS-422 TransceiversLevel TranslatorsTransceivers for EMI-Sensitive ApplicationsIndustrial-Control Local Area Networks______________________________________________________________Selection TablePART

NUMBER

MAX481

MAX483

MAX485

MAX487

MAX488

MAX489

MAX490

MAX491

MAX1487

HALF/FULL

DUPLEX

HalfHalfHalfHalfFullFullFullFullHalfDATA

RATE

(Mbps)

2.50.252.50.250.250.252.52.52.5SLEW-RATE

LIMITED

NoYesNoYesYesYesNoNoNoLOW-RECEIVER/QUIESCENT NUMBER OF

POWER DRIVER CURRENT RECEIVERS ON

SHUTDOWN ENABLE (μA) BUS

YesYesNoYesNoNoNoNoNoYesYesYesYesNoYesNoYesYes32323232128PIN

COUNT

88888148148For pricing, delivery, and ordering information, please contact Maxim Direct at 1-,

or visit Maxim Integrated’s website at .19-0122; Rev 10; 9/14

MAX481/MAX483/MAX485/MAX487–MAX491/MAX1487Low-Power, Slew-Rate-LimitedRS-485/RS-422 TransceiversTOP VIEWVCC1RO2DI3GND4DR8765ABZY

DI35YVCC1VCCMAX488MAX490RtD6ZRRODIP/SO8ABAVCCRO12348ZYGNDDI4GNDNOTE: TYPICAL OPERATING CIRCUIT SHOWN WITH DIP/SO 2R7BRtDDIMAX488MAX490765μMAXFigure 2. MAX488/MAX490 Pin Configuration and Typical Operating CircuitTOP 1, 8, DIGNDGNDD10RRORDDIDIP/SO6, 7REGNDGNDDEFigure 3. MAX489/MAX491 Pin Configuration and Typical Operating Circuit__________Applications InformationThe MAX481/MAX483/MAX485/MAX487–MAX491 andMAX1487 are low-power transceivers for RS-485 and RS-422 communications. The MAX481, MAX485, MAX490,MAX491, and MAX1487 can transmit and receive at datarates up to 2.5Mbps, while the MAX483, MAX487,MAX488, and MAX489 are specified for data rates up to250kbps. The MAX488–MAX491 are full-duplex trans-ceivers while the MAX481, MAX483, MAX485, MAX487,and MAX1487 are half-duplex. In addition, Driver Enable(DE) and Receiver Enable (RE) pins are included on theMAX481, MAX483, MAX485, MAX487, MAX489,MAX491, and MAX1487. When disabled, the driver andreceiver outputs are high 487/MAX1487:128 Transceivers on the BusThe 48kΩ,

1/4-unit-load receiver input impedance of theMAX487 and MAX1487 allows up to 128 transceiverson a bus, compared to the 1-unit load (12kΩinputimpedance) of standard RS-485 drivers (32 trans-ceivers maximum). Any combination of MAX487/MAX1487 and other RS-485 transceivers with a total of32 unit loads or less can be put on the bus. TheMAX481/MAX483/MAX485 and MAX488–MAX491 havestandard 12kΩReceiver Input impedance.8Maxim Integrated