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LMS1487IM

更新时间： 2024-11-06 22:24:07
品牌 Logo 应用领域
美国国家半导体 - NSC 总线收发器
页数 文件大小 规格书
13页 247K
描述
5V Low Power RS-485 / RS-422 Differential Bus Transceiver

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中文翻译

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LMS1487IM 技术参数

是否Rohs认证： 不符合生命周期：Obsolete
包装说明：SOP, SOP8,.25Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.3差分输出：YES
驱动器位数：1输入特性：DIFFERENTIAL SCHMITT TRIGGER
接口集成电路类型：LINE TRANSCEIVER接口标准：EIA-422-B; TIA-422-B; EIA-485-A; TIA-485-A; V.11; X.27
JESD-30 代码：R-PDSO-G8JESD-609代码：e0
长度：4.902 mm湿度敏感等级：1
功能数量：1端子数量：8
最高工作温度：85 °C最低工作温度：-40 °C
最小输出摆幅：1.5 V最大输出低电流：0.004 A
封装主体材料：PLASTIC/EPOXY封装代码：SOP
封装等效代码：SOP8,.25封装形状：RECTANGULAR
封装形式：SMALL OUTLINE峰值回流温度（摄氏度）：235
电源：5 V认证状态：Not Qualified
最大接收延迟：200 ns接收器位数：1
座面最大高度：1.753 mm子类别：Line Driver or Receivers
最大压摆率：0.5 mA最大供电电压：5.25 V
最小供电电压：4.75 V标称供电电压：5 V
表面贴装：YES温度等级：INDUSTRIAL
端子面层：Tin/Lead (Sn85Pb15)端子形式：GULL WING
端子节距：1.27 mm端子位置：DUAL
处于峰值回流温度下的最长时间：30最大传输延迟：60 ns
宽度：3.899 mm

LMS1487IM 数据手册

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April 2003  
LMS1487  
5V Low Power RS-485 / RS-422 Differential Bus  
Transceiver  
General Description  
Features  
n Meet ANSI standard RS-485-A and RS-422-B  
n Data rate 2.5 Mbps  
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  
n Single supply voltage operation, 5V  
n Wide input and output voltage range  
n Thermal shutdown protection  
n Short circuit protection  
™
V.11 and X.27. The LMS1487 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, 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 VCC = 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’s MAX1487  
n Low quiescent current 320µA  
n Allows up to 128 transceivers on the bus  
n Open circuit fail-safe for receiver  
n Extended operating temperature range −40˚C to 85˚C  
Drop-in replacement to MAX1487  
n
n Available in 8-pin SOIC and 8-pin DIP package  
Applications  
n Low power RS-485 systems  
n Network hubs, bridges, and routers  
n Point of sales equipment (ATM, barcode scanners,…)  
n Local area networks (LAN)  
n Integrated service digital network (ISDN)  
n Industrial programmable logic controllers  
n High speed parallel and serial applications  
n 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.  
© 2003 National Semiconductor Corporation  
DS200530  
www.national.com  
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