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參數(shù)資料
| 型號(hào)： | LMS485ECM |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 通用總線功能 |
| 英文描述： | Low Power RS-485 / RS-422 Differential Bus Transceiver |
| 中文描述： | LINE TRANSCEIVER, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁(yè)數(shù)： | 1/13頁(yè) |
| 文件大?。?/td> | 248K |
| 代理商： | LMS485ECM |
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LMS485E
Low Power RS-485 / RS-422 Differential Bus Transceiver
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 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 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 V
= 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 avail-
able in 8-Pin SOIC and 8-pin DIP packages. It is a drop-in
replacement to Maxim’s MAX485E.
Features
n
Meet ANSI standard RS-485 and RS-422
n
Data rate 2.5 Mbps
n
Single supply voltage operation, 5V
n
Wide input and output voltage range
n
Thermal shutdown protection
n
Short circuit protection
n
Low quiescent current 800μA (max)
n
Allows up to 32 transceivers on the bus
n
Open circuit fail-safe for receiver
n
Extended operating temperature range 40C to 85C
n
Drop-in replacement to MAX485E
n
Available in 8-pin SOIC and 8-pin DIP packages
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
20086601
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.
November 2003
L
2003 National Semiconductor Corporation
DS200866
www.national.com
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LMS485ECMX | Low Power RS-485 / RS-422 Differential Bus Transceiver |
| LMS485ECNA | Low Power RS-485 / RS-422 Differential Bus Transceiver |
| LMS485EIM | Low Power RS-485 / RS-422 Differential Bus Transceiver |
| LMS485EIMX | Low Power RS-485 / RS-422 Differential Bus Transceiver |
| LMS485EINA | Low Power RS-485 / RS-422 Differential Bus Transceiver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMS485ECMX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Low Power RS-485 / RS-422 Differential Bus Transceiver |
| LMS485ECNA | 制造商:Texas Instruments 功能描述:IC LO POWER 5V RS422/485 XCVR 15KV |
| LMS485ECNA/NOPB | 制造商:Texas Instruments 功能描述:Single Transmitter/Receiver RS-422/RS-485 8-Pin PDIP Rail |
| LMS485EIM | 制造商:Texas Instruments 功能描述:LO POWER 5V RS422/485 XCVR 15KV 485 |
| LMS485EIM/NOPB | 功能描述:TXRX 5V RS422/485 DIFF BUS 8SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:25 系列:- 類型:收發(fā)器 驅(qū)動(dòng)器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:4.5 V ~ 5.5 V 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:16-PDIP 包裝:管件 |
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