lms485 National Semiconductor Corporation, lms485 Datasheet

lms485

Manufacturer Part Number

lms485

Description

5v Low Power Rs-485 / Rs-422 Differential Bus

Manufacturer

National Semiconductor Corporation

Datasheet

1.LMS485.pdf (13 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

lms485CM

Manufacturer:

nstion

Quantity:

112

Company:

Meier Automation Equipment Co., Limited

Part Number:

lms485CM

Manufacturer:

TI/德州仪器

Quantity:

20 000

Company:

Meier Automation Equipment Co., Limited

Part Number:

lms485CM/NOPB

Manufacturer:

NS/国半

Quantity:

20 000

Company:

Meier Automation Equipment Co., Limited

Part Number:

lms485CMX

Manufacturer:

NS/国半

Quantity:

20 000

Company:

Meier Automation Equipment Co., Limited

Part Number:

lms485CMX/NOPB

Manufacturer:

NS/国半

Quantity:

20 000

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

lms485CN

Manufacturer:

Quantity:

50 210

Company:

Meier Automation Equipment Co., Limited

Part Number:

lms485CN

Manufacturer:

TI/德州仪器

Quantity:

20 000

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

lms485ECMX

Manufacturer:

Quantity:

50 210

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

lms485ECNA

Manufacturer:

Quantity:

50 210

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

lms485EIM

Manufacturer:

Quantity:

50 210

Current page: 1 of 13
Download datasheet (250Kb)

LMS485

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

Transceiver

General Description

The LMS485 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 LMS485 combines a TRI-STATE

ferential 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

ports feature wide positive and negative common mode

voltage ranges, making the device suitable for multipoint

applications in noisy environments. The LMS485 is available

in a 8-Pin SOIC and 8-Pin DIP packages. It is a drop-in

socket replacement to Maxim’s MAX485

Typical Application

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 failsafe 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.

DS200626

= 0V. These

™

dif-

Features

n Meet ANSI standard RS-485-A and RS-422-B

n Data rate 2.5 Mbps

n Single supply voltage operation, 5V

n Thermal shutdown protection

n Short circuit protection

n Low power BiCMOS

n Allows up to 32 transceivers on the bus

n Open circuit fail-safe for receiver

n Extended operating temperature range −40˚C to 85˚C

n Drop-in replacement to MAX485

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

www.national.com

20062601

April 2003

Related parts for lms485

Related keywords

lms485 datasheet
lms485 data sheet
lms485 pdf datasheet
lms485 component
lms485 part
lms485 distributor
lms485 RoHS
lms485 datasheet download