Rainbow-electronics MAX14770E Manual do Utilizador descarregar pdf

_______________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

High-ESD Profibus RS-485 Transceiver

MAX14770E

General Description

The MAX14770E is a half-duplex, Q35kV high ESD-

protected transceiver for PROFIBUS-DP and RS-485

applications. In addition, it can be used for RS-422/V.11

communications. The MAX14770E is designed to meet

IEC 61158-2, TIA/EIA-422-B, TIA/EIA-485-A, V.11, and

X.27 standards.

The MAX14770E operates from a +5V supply and has

true fail-safe circuitry that guarantees a logic-high receiv-

er output when the receiver inputs are open or shorted.

The MAX14770E features a 1/4 standard-unit load

receiver input impedance, allowing up to 128 1/4 unit

load transceivers on the bus. Drivers are short-circuit

current limited and are protected against excessive

power dissipation by thermal-shutdown circuitry.

The MAX14770E is available in 8-pin SO and tiny TDFN

(3mm x 3mm) packages, and is specified over the extend-

ed (-40NC to +85NC) and automotive (-40NC to +125NC)

temperature ranges.

Applications

PROFIBUS-DP Networks

Industrial Fieldbuses

Motion Controllers

RS-485 Networks

Machine Encoders

Features

S Meets EIA 61158-2 Type 3 PROFIBUS-DP

S +4.5V to +5.5V Supply Voltage

S 20Mbps Data Rate

S Short-Circuit Protected

S True Fail-Safe Receiver

S Thermal-Shutdown Protected

S Hot Swappable

S High ESD Protection

±35kV Human Body Model (HBM)

±20kV IEC 61000-4-2 Air Gap

±10kV IEC 61000-4-2 Contact

S -40NC to +125NC Automotive Temperature Range

in Tiny 8-Pin (3mm x 3mm) TDFN

19-5017; Rev 0; 10/09

Functional Diagram

Ordering Information

+Denotes a lead(Pb)-free/RoHS-compliant package.

T = Tape and reel.

*EP = Exposed pad.

The PROFI BUS PROCESS FIELD BUS logo is a registered

trademark of PROFIBUS and PROFINET International (PI).

Typical PROFIBUS-DP Operating Circuit appears at end of

data sheet.

SHUTDOWN

MAX14770E

PART TEMP RANGE

PIN-

PACKAGE

TOP

MARK

MAX14770EESA+T

-40NC to +85NC

8 SO —

MAX14770EATA+T

-40NC to +125NC

8 TDFN-EP* BMG

1 2 3 4 5 6 ... 14 15

MAX14770E 1

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_______________________________________________________________ Maxim Integrated Products 1For pricing, delivery, and ordering information, pleas

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High-ESD Profibus RS-485 TransceiverMAX14770E______________________________________________________________________________________ 13Thermal-Shutd

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High-ESD Profibus RS-485 TransceiverMAX14770E14 _____________________________________________________________________________________Extended ESD

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High-ESD Profibus RS-485 TransceiverMAX14770EMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a M

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High-ESD Profibus RS-485 TransceiverMAX14770E2 ______________________________________________________________________________________Stresses bey

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High-ESD Profibus RS-485 TransceiverMAX14770E_______________________________________________________________________________________ 3ELECTRICAL CH

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High-ESD Profibus RS-485 TransceiverMAX14770E4 ______________________________________________________________________________________ELECTRICAL CH

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High-ESD Profibus RS-485 TransceiverMAX14770E_______________________________________________________________________________________ 5ELECTRICAL CH

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High-ESD Profibus RS-485 TransceiverMAX14770E6 ______________________________________________________________________________________Figure 1. Dri

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High-ESD Profibus RS-485 TransceiverMAX14770E_______________________________________________________________________________________ 7Figure 5. Dri

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High-ESD Profibus RS-485 TransceiverMAX14770E8 ______________________________________________________________________________________Figure 8. Rec

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High-ESD Profibus RS-485 TransceiverMAX14770E_______________________________________________________________________________________ 9

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