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LMS1487IM Datasheet

  • LMS1487IM

  • 5V Low Power RS-485 / RS-422 Differential Bus Transceiver

  • 13頁(yè)

  • NSC

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LMS1487 5V Low Power RS-485 / RS-422 Differential Bus Transceiver
April 2003
LMS1487
5V Low Power RS-485 / RS-422 Differential Bus
Transceiver
General Description
The LMS1487 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 LMS1487 combines a TRI-STATE
鈩?/div>
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, respec-
tively, 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 V
CC
= 0V. These
ports feature wide positive and negative common mode
voltage ranges, making the device suitable for multipoint
applications in noisy environments. The LMS1487 is avail-
able in a 8-Pin SOIC and 8-pin DIP packages. It is a drop-in
socket replacement to Maxim鈥檚 MAX1487
Features
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Meet ANSI standard RS-485-A and RS-422-B
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 320碌A(chǔ)
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 MAX1487
Available in 8-pin SOIC and 8-pin DIP package
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
20053001
A Typical multipoint application is shown in the above figure. Terminating resistors, 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
DS200530
www.national.com

LMS1487IM 產(chǎn)品屬性

  • SOIC

  • 8

  • -40°C 到 +85°C

  • No SVHC (19-Dec-2011)

  • 1487

  • SOIC

  • -40°C

  • 85°C

  • RS485, RS422

  • 1

  • 差分

  • 2.5Mbps

  • 5V

  • 5.25V

  • 4.75V

  • 320μA

  • 1487

  • 表面安裝

  • 1487

  • 1

LMS1487IM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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