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LMS1487EIMX Datasheet

  • LMS1487EIMX

  • Low Power RS-485 / RS-422 Differential Bus Transceiver

  • 247.35KB

  • 13頁

  • NSC

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LMS1487E Low Power RS-485 / RS-422 Differential Bus Transceiver
November 2003
LMS1487E
Low Power RS-485 / RS-422 Differential Bus Transceiver
General Description
The LMS1487E is a low power differential bus/line trans-
ceiver designed for high speed bidirectional data communi-
cation 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
鹵
15kV ESD protection. The LMS1487E combines a
TRI-STATE
鈩?/div>
differential line driver and differential input re-
ceiver, 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 re-
ceiver 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 V
CC
= 0V. These ports feature wide positive and negative com-
mon mode voltage ranges, making the device suitable for
multipoint applications in noisy environments. The
LMS1487E is available in 8-Pin SOIC and 8-pin DIP pack-
ages. It is a drop-in replacement to Maxim鈥檚 MAX1487E.
Features
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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 660碌A(chǔ) (max)
Allows up to 128 transceivers on the bus
Open circuit fail-safe for receiver
Extended operating temperature range 鈭?0藲C to 85藲C
Drop-in replacement to MAX1487E
Available in 8-pin SOIC and 8-pin DIP packages
Applications
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Low power RS-485 systems
Network hubs, bridges, and routers
Point of sales equipment (ATM, barcode scanners,鈥?
Local area networks (LAN)
Integrated service digital network (ISDN)
Industrial programmable logic controllers
High speed parallel and serial applications
Multipoint applications with noisy environment
Typical Application
20085601
A typical multipoint application is shown in the above figure. Terminating resistor, RT are typically required but only located at the two ends of the cable.
Pull-up and pull-down resistors maybe required at the end of the bus to provide fail-safe biasing. The biasing resistors provide a bias to the cable when all
drivers are in TRI-STATE, See National Application Note, AN-847 for further information.
漏 2003 National Semiconductor Corporation
DS200856
www.national.com

LMS1487EIMX相關(guān)型號(hào)PDF文件下載

  • 型號(hào)
    版本
    描述
    廠商
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  • 英文版
    12-bit Cascadable Multiplier-Summer
    LOGIC
  • 英文版
    12-bit Cascadable Multiplier-Summer
    LODEV [LOG...
  • 英文版
    5V Low Power RS-485 Differential Bus Transceiver
    NSC
  • 英文版
    5V Low Power RS-485 Differential Bus Transceiver
    NSC [Natio...
  • 英文版
    5V Low Power RS-485 / RS-422 Differential Bus Transceiver
    NSC
  • 英文版
    5V Low Power RS-485 / RS-422 Differential Bus Transceiver
    NSC [Natio...
  • 英文版
    5A and 3A Low Dropout Fast Response Regulators
    NSC
  • 英文版
    5A and 3A Low Dropout Fast Response Regulators
    NSC [Natio...
  • 英文版
    5A and 3A Low Dropout Fast Response Regulators
    NSC
  • 英文版
    5A and 3A Low Dropout Fast Response Regulators
    NSC [Natio...
  • 英文版
    Voltage-Mode SMPS Controller
    ETC
  • 英文版
    5V Low Power RS-485 Differential Bus Transceiver
    NSC
  • 英文版
    5V Low Power RS-485 Differential Bus Transceiver
    NSC [Natio...
  • 英文版
    Low Power RS-485 / RS-422 Differential Bus Transceiver
    NSC
  • 英文版
    Low Power RS-485 / RS-422 Differential Bus Transceiver
    NSC [Natio...
  • 英文版
    5A and 3A Low Dropout Fast Response Regulators
    NSC
  • 英文版
    5A and 3A Low Dropout Fast Response Regulators
    NSC [Natio...
  • 英文版
    Multiplier/Accumulator
    ETC
  • 英文版
    Multiplier/Accumulator
    ETC
  • 英文版
    Multiplier/Accumulator
    ETC

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