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Part Number: LMS485E
Description: The LMS485E is a low power differential bus/line transceiver designed for high speed bidirectional dat...
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LMS485E
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General Description
LMS485E General Description
The LMS485E 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 driver outputs and receiver inputs have ±15kV ESD protection. The LMS485E combines a TRISTATE ™ 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 outputs and receiver inputs are internally connected to form a differential input/output (I/O) bus port that is 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 LMS485E is available in 8-Pin SOIC and 8-pin DIP packages. It is a drop-in replacement to Maxim's MAX485E.
LMS485E 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
LMS485E Features
·Meet ANSI standard RS-485 and RS-422
·Data rate 2.5 Mbps
·Single supply voltage operation, 5V
·Wide input and output voltage range
·Thermal shutdown protection
·Short circuit protection
·Low quiescent current 800µA (max)
·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 MAX485E
·Available in 8-pin SOIC and 8-pin DIP packages
·Data rate 2.5 Mbps
·Single supply voltage operation, 5V
·Wide input and output voltage range
·Thermal shutdown protection
·Short circuit protection
·Low quiescent current 800µA (max)
·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 MAX485E
·Available in 8-pin SOIC and 8-pin DIP packages
LMS485E 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
LMS485E Connection Diagram
LMS485E
PDF/DataSheet Download
- Datasheet: LMS485E
- File Size: 254927 KB
- Manufacturer: NSC [National Semiconductor]
- Click here to Download
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