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Part Number: LMS485
Description: The LMS485 is a low power differential bus/line transceiver designed for high speed bidirectional data...
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LMS485
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DataSheet
General Description
LMS485 General Description
The LMS485 is a low power differential bus/line transceiver designed for high speed bidirectional data communication on multipoint bus transmission lines. It is designed for balanced transmission lines. It meets ANSI Standards TIA/EIA RS422-B, TIA/EIA RS485-A and ITU recommendation and V.11 and X.27. The LMS485 combines a TRI-STATE™ differential line driver and differential input receiver, both of which operate from a single 5.0V power supply.
The driver and receiver have an active high and active low, respectively, that can be externally connected to function as a direction control. The driver and receiver differential inputs are internally connected to form differential input/output (I/O) bus ports that are designed to offer minimum loading to bus whenever the driver is disabled or when VCC = 0V. These ports feature wide positive and negative common mode voltage ranges, making the device suitable for multipoint applications in noisy environments.
The LMS485 is available in a 8-Pin SOIC and 8-Pin DIP packages. It is a drop-in socket replacement to Maxim's MAX485
LMS485 Maximum Ratings
Supply Voltage, VCC (Note 2) .................................................................6V
Input Voltage, VIN (DI, DE, or RE) ...............................−0.3V to VCC + 0.3V
Voltage Range at Bus Terminals (AB) ........................................−7V to 12V
Receiver Output ..........................................................−0.3V to VCC + 0.3V
Package Thermal Impedance, JA
SOIC ..............................................................................................125/W
DIP ...................................................................................................92/W
Junction Temperature (Note 3) ...........................................................150
Operating Free-Air Temperature
Range, TA
Commercial .................................................................................0 to 70
Industrial ................................................................................−40 to 85
Storage Temperature Range ................................................−65 to 150
Soldering Information
Infrared or Convection (20 sec.) .........................................................235
Lead Temperature Range .................................................................+260
ESD Rating (Human Body Model)(Note 4)
Bus Pins ...............................................................................................15kV
Other Pins ..............................................................................................2kV
ESD Rating (Machine Model)
All Pins .................................................................................................200V
Input Voltage, VIN (DI, DE, or RE) ...............................−0.3V to VCC + 0.3V
Voltage Range at Bus Terminals (AB) ........................................−7V to 12V
Receiver Output ..........................................................−0.3V to VCC + 0.3V
Package Thermal Impedance, JA
SOIC ..............................................................................................125/W
DIP ...................................................................................................92/W
Junction Temperature (Note 3) ...........................................................150
Operating Free-Air Temperature
Range, TA
Commercial .................................................................................0 to 70
Industrial ................................................................................−40 to 85
Storage Temperature Range ................................................−65 to 150
Soldering Information
Infrared or Convection (20 sec.) .........................................................235
Lead Temperature Range .................................................................+260
ESD Rating (Human Body Model)(Note 4)
Bus Pins ...............................................................................................15kV
Other Pins ..............................................................................................2kV
ESD Rating (Machine Model)
All Pins .................................................................................................200V
LMS485 Features
·Meet ANSI standard RS-485-A and RS-422-B
·Data rate 2.5 Mbps
·Single supply voltage operation, 5V
·Thermal shutdown protection
·Short circuit protection
·Low power BiCMOS
·Allows up to 32 transceivers on the bus
·Open circuit fail-safe for receiver
·Extended operating temperature range −40°C to 85°C
·Drop-in replacement to MAX485
·Available in 8-pin SOIC and 8-Pin DIP package
·Data rate 2.5 Mbps
·Single supply voltage operation, 5V
·Thermal shutdown protection
·Short circuit protection
·Low power BiCMOS
·Allows up to 32 transceivers on the bus
·Open circuit fail-safe for receiver
·Extended operating temperature range −40°C to 85°C
·Drop-in replacement to MAX485
·Available in 8-pin SOIC and 8-Pin DIP package
LMS485 Typical Application
`Low power RS-485 systems
`Network hubs, bridges, and routers
`Point of sales equipment (ATM, barcode scanners,.)
`Local area networks (LAN)
`Integrated service digital network (ISDN)
`Industrial programmable logic controllers
`High speed parallel and serial applications
`Multipoint applications with noisy environment
`Network hubs, bridges, and routers
`Point of sales equipment (ATM, barcode scanners,.)
`Local area networks (LAN)
`Integrated service digital network (ISDN)
`Industrial programmable logic controllers
`High speed parallel and serial applications
`Multipoint applications with noisy environment
LMS485 Connection Diagram
LMS485
PDF/DataSheet Download
- Datasheet: LMS485
- File Size: 255726 KB
- Manufacturer: NSC [National Semiconductor]
- Click here to Download
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