MAX1487:Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers

The MAX481, MAX483, MAX485, MAX487-MAX491, and MAX1487 are low-power transceivers for RS-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, MAX491, and MAX1487 are not limited, allowing them to transmit up to 2.5Mbps. These transceivers draw between 120µA and 500µA of supply current when unloaded or fully loaded with disabled drivers. Additionally, the MAX481, MAX483, and MAX487 have a low-current shutdown mode in which they consume only 0.1µA. 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-impedance state. The receiver input has a fail-safe feature that guarantees a logic-high output if the input is open circuit. The MAX487 and MAX1487 feature quarter-unit-load receiver input impedance, allowing up to 128 MAX487/MAX1487 transceivers on the bus. Full-duplex communications are obtained using the MAX488–MAX491, while the MAX481, MAX483, MAX485, MAX487, and MAX1487 are designed for half-duplex applications.

Key Features
  • For Fault-Tolerant Applications
    • MAX3430: ±80V Fault-Protected, Fail-Safe, 1/4 Unit Load, +3.3V, RS-485 Transceiver
    • MAX3440E–MAX3444E: ±15kV 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
    • 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 Transmitters
  • For Multiple Transceiver Applications
    • MAX3030E–MAX3033E: ±15kV 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
MAX1487, MAX481, MAX483, MAX485, MAX487, MAX488, MAX489, MAX490, MAX491: Pin Configuration and Typical Operating Circuit
MAX1487, MAX481, MAX483, MAX485, MAX487, MAX488, MAX489, MAX490, MAX491: Pin Configuration and Typical Operating Circuit
Applications/Uses
  • Industrial-Control Local Area Networks
  • Level Translators
  • Low-Power RS-422 Transceivers
  • Low-Power RS-485 Transceivers
  • Transceivers for EMI-Sensitive Applications
DataSheet
titleDownload file
MAX1487-MAX491 Data SheetMAX1487-MAX491.pdf
Parametrics
Part NumberTx/RxDuplexVSUPPLY
(V)
ICC
(mA)
Data Rate
(kbps)
Tx ENRx ENICC (Shutdn.)
(µA)
Rx/Tx on BusRx Failsafe w/ InputsSlew Rate LimitingOper. Temp.
(°C)
Package/PinsBudgetary
Price
typmintypSee Notes
MAX14871Tx + 1RxHalf50.32500YesYes-128OpenNo-55 to +125
-40 to +85
0 to +70
µMAX/8
PDIP(N)/8
SOIC(N)/8
$1.54 @1k
MAX481Half0.52500YesYes0.132µMAX/8
CDIP(N)/8
PDIP(N)/8
SOIC(N)/8
MAX483Half0.35250YesYes0.132µMAX/8
CDIP(N)/8
PDIP(N)/8
SOIC(N)/8
MAX485Half0.52500YesYes-32µMAX/8
CDIP(N)/8
PDIP(N)/8
SOIC(N)/8
MAX487Half0.25250YesYes0.1128µMAX/8
CDIP(N)/8
PDIP(N)/8
SOIC(N)/8
MAX488Full0.12250NoNo-32µMAX/8
CDIP(N)/8
PDIP(N)/8
SOIC(N)/8
MAX489Full0.12250YesYes-32CDIP(N)/14
PDIP(N)/14
SOIC(N)/14
MAX490Full0.32500NoNo-32µMAX/8
CDIP(N)/8
PDIP(N)/8
SOIC(N)/8
MAX491Full0.32500YesYes-32CDIP(N)/14
PDIP(N)/14
SOIC(N)/14
Quality and Environmental Data
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX1487C/DLast Time BuyDICE SALES,;NA pin;DICE S;0°C to +70°CSee data sheet
MAX1487CPANo Longer AvailableMAX1487CPA+PDIP(N),;8 pin;79.7 mm²0°C to +70°CNo
MAX1487CPA+ActivePDIP(N),;8 pin;79.7 mm²0°C to +70°CLead Free
MAX1487CSANo Longer AvailableMAX1487CSA+SOIC(N),;8 pin;30.9 mm²0°C to +70°CNo
MAX1487CSA+ActiveSOIC(N),;8 pin;30.9 mm²0°C to +70°CLead Free
MAX1487CSA+TActiveSOIC(N),;8 pin;30.9 mm²0°C to +70°CLead Free
MAX1487CSA-TNo Longer AvailableMAX1487CSA+TSOIC(N),;8 pin;30.9 mm²0°C to +70°CNo
MAX1487CUANo Longer AvailableMAX1487CUA+µMAX,;8 pin;15.6 mm²0°C to +70°CNo
MAX1487CUA+ActiveµMAX,;8 pin;15.6 mm²0°C to +70°CLead Free
MAX1487CUA+TActiveµMAX,;8 pin;15.6 mm²0°C to +70°CLead Free
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX1487CUA-TNo Longer AvailableMAX1487CUA+TµMAX,;8 pin;15.6 mm²0°C to +70°CNo
MAX1487EPANo Longer AvailableMAX1487EPA+PDIP(N),;8 pin;79.7 mm²-40°C to +85°CNo
MAX1487EPA+ActivePDIP(N),;8 pin;79.7 mm²-40°C to +85°CLead Free
MAX1487ESANo Longer AvailableMAX1487ESA+SOIC(N),;8 pin;30.9 mm²-40°C to +85°CNo
MAX1487ESA+ActiveSOIC(N),;8 pin;30.9 mm²-40°C to +85°CLead Free
MAX1487ESA+TActiveSOIC(N),;8 pin;30.9 mm²-40°C to +85°CLead Free
MAX1487ESA-TNo Longer AvailableMAX1487ESA+TN.SO;8 pin-40°C to +85°CSee data sheet
MAX1487-MAX491.pdf MAX491
MAX1487-MAX491_cn.pdf MAX491
Explanation of Maxim RS-485 Features MAX489
MAX1487.pdf MAX1487
MAX1487-MAX491_cn.pdf MAX491