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General Description

The MAX3430 fault-protected RS-485 transceiver features

±80V protection from overvoltage signal faults on commu-

nication bus lines. Each device contains one driver and

one receiver, and the output pins can withstand faults,

with respect to ground, of up to ±80V. Even if the faults

occur when the transceiver is active, shut down, or pow-

ered off, the device will not be damaged. The MAX3430

operates from a 3.3V supply and features a slew-rate-lim-

ited driver that minimizes EMI and reduces reflections

caused by improperly terminated cables, allowing error-

free data transmission at data rates up to 250kbps. The

MAX3430 has a 1/4-unit-load receiver input impedance

allowing up to 128 transceivers on a single bus and fea-

tures fail-safe circuitry, which guarantees a logic-high

receiver output when the receiver inputs are open.

Hot-swap circuitry eliminates false transitions on the

data cable during circuit initialization or connection to a

live backplane. Short-circuit current limiting and ther-

mal-shutdown circuitry protect the driver against exces-

sive power dissipation.

The MAX3430 is available in 8-pin SO and 8-pin PDIP

packages, and is specified over commercial and indus-

trial temperature ranges.

Applications

RS-422/RS-485 Communications

Lighting Systems

Industrial-Control Local Area Networks

Profibus Applications

Multimaster RS-485 Networks

Features

♦ ±80V Fault Protection

♦ ±12kV ESD Protection

♦ +3.3V Operation

♦ Internal Slew-Rate Limiting

♦ 250kbps Data Rate

♦ Allows Up to 128 Transceivers on the Bus

♦ -7V to +12V Common-Mode Input Voltage Range

♦ True Fail-Safe Inputs

♦ Hot-Swap Input Structure on DE

♦ Available in 8-Pin SO and PDIP Packages

MAX3430

±80V Fault-Protected, Fail-Safe,

1/4-Unit Load, +3.3V RS-485 Transceiver

________________________________________________________________ Maxim Integrated Products 1

Pin Configuration and Typical Operating Circuit

Ordering Information

CC 0.1µF

GND

MAX3430

19-2756; Rev 0; 1/03

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

PART TEMP RANGE PIN-PACKAGE

MAX3430CPD 0°C to +70°C 8 Plastic DIP

MAX3430CSD 0°C to +70°C 8 SO

MAX3430EPD -40°C to +85°C 8 Plastic DIP

MAX3430ESD -40°C to +85°C 8 SO

TOP VIEW

GND

DIP/SO

1 2 3 4 5 6 ... 12 13

Resumo do Conteúdo

Página 1 - Ordering Information

General DescriptionThe MAX3430 fault-protected RS-485 transceiver features±80V protection from overvoltage signal faults on commu-nication bus lines.

Página 2 - DC ELECTRICAL CHARACTERISTICS

MAX3430±80V Fault-Protected, Fail-Safe,1/4-Unit Load, +3.3V RS-485 Transceiver10 _____________________________________________________________________

Página 3 - PROTECTION SPECIFICATIONS

MAX3430±80V Fault-Protected, Fail-Safe,1/4-Unit Load, +3.3V RS-485 Transceiver________________________________________________________________________

Página 4

MAX3430±80V Fault-Protected, Fail-Safe,1/4-Unit Load, +3.3V RS-485 Transceiver12 _____________________________________________________________________

Página 5 - = +3.3V, T

MAX3430±80V Fault-Protected, Fail-Safe,1/4-Unit Load, +3.3V RS-485 TransceiverMaxim cannot assume responsibility for use of any circuitry other than c

Página 6 - Test Circuits/Timing Diagrams

MAX3430±80V Fault-Protected, Fail-Safe,1/4-Unit Load, +3.3V RS-485 Transceiver2 ______________________________________________________________________

Página 7

MAX3430±80V Fault-Protected, Fail-Safe,1/4-Unit Load, +3.3V RS-485 Transceiver________________________________________________________________________

Página 8 - Function Tables

MAX3430±80V Fault-Protected, Fail-Safe,1/4-Unit Load, +3.3V RS-485 Transceiver4 ______________________________________________________________________

Página 9 - Detailed Description

MAX3430±80V Fault-Protected, Fail-Safe,1/4-Unit Load, +3.3V RS-485 Transceiver________________________________________________________________________

Página 10 - Hot-Swap Capability

MAX3430±80V Fault-Protected, Fail-Safe,1/4-Unit Load, +3.3V RS-485 Transceiver6 ______________________________________________________________________

Página 11 - Chip Information

MAX3430±80V Fault-Protected, Fail-Safe,1/4-Unit Load, +3.3V RS-485 Transceiver________________________________________________________________________

Página 12 - Package Information

MAX3430±80V Fault-Protected, Fail-Safe,1/4-Unit Load, +3.3V RS-485 Transceiver8 ______________________________________________________________________

Página 13 - PDIPN.EPS

MAX3430±80V Fault-Protected, Fail-Safe,1/4-Unit Load, +3.3V RS-485 Transceiver________________________________________________________________________

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Rainbow-electronics MAX3430 Manual do Utilizador

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