DS485N National Semiconductor, DS485N Datasheet

DS485N

Manufacturer Part Number

DS485N

Description

Transceiver IC

Manufacturer

National Semiconductor

Datasheets

1.DS485TN.pdf (9 pages)

2.DS485N.pdf (10 pages)

Specifications of DS485N

No. Of Drivers

Driver Case Style

DIP

No. Of Pins

Operating Temperature Range

0Â°C To +70Â°C

I/o Type

Driver/Receiver

Transceiver Type

Multipoint

Mounting Type

Through Hole

No. Of Channels

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

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Price

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DS485

Low Power RS-485/RS-422 Multipoint Transceiver

General Description

The DS485 is a low-power transceiver for RS-485 and RS-

422 communication. The device contains one driver and one

receiver. The drivers slew rate allows for operation up to 2.5

Mbps (see Applications Information section).

The transceiver draws 200 µA of supply current when un-

loaded or fully loaded with the driver disabled and operates

from a single +5V supply.

The driver is short-circuit current limited and is protected

against excessive power dissipation by thermal shutdown

circuitry that places the driver outputs into TRI-STATE

(High Impedance state) under fault conditions. The driver

guarantees a minimum of 1.5V differential output voltage

with maximum loading across the common mode range

The receiver has a failsafe feature that guarantees a logic-

high output if the input is open circuit.

The DS485 is available in surface mount and DIP packages

and is characterized for Industrial and Commercial tempera-

ture range operation.

Connection and Logic Diagram

TRI-STATE

DS485N

DS485M

DS485TN

DS485TM

OD3

Order Number

is a registered trademark of National Semiconductor Corporation.

0˚C to +70˚C

−40˚C to +85˚C

DIP and SOIC

Temp. Range

01288001

DS012880

DIP/N08E

SOP/M08A

DIP/N08E

SOP/M08A

Package/###

Features

n Meets TIA/EIA RS-485 multipoint standard

n Guaranteed full load output voltage (V

n Low quiescent current:

n −7V to +12V common-mode input voltage range

n TRI-STATE outputs on driver and receiver

n AC performance:

n Half-duplex flow through pinout

n Operates from a single 5V supply

n Allows up to 32 transceivers on the bus

n Current-limiting and thermal shutdown for driver

n Industrial temperature range operation

n Pin and functional compatible with MAX485 and LTC485

Truth Table

*Note: Non Terminated, Open Input only

X = indeterminate

Z = TRI-STATE

DRIVER SECTION

RECEIVER SECTION

overload protection

— Driver transition time: 25 ns typ

— Driver propagation delay: 40 ns typ

— Driver skew: 1 ns typ

— Receiver propagation delay: 200 ns typ

— Receiver skew: 20 ns typ

RE*

200 µA typ

OPEN*

≥+0.2V

≤−0.2V

A-B

OD3

)

www.national.com

July 1998

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