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MAX3291, MAX3292

RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance Communication

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

The MAX3291/MAX3292 high-speed RS-485/RS-422 transceivers feature driver preemphasis circuitry, which extends the distance and increases the data rate of reliable communication by reducing intersymbol interference (ISI) caused by long cables. The MAX3291 is programmable for data rates of 5Mbps to 10Mbps, while the MAX3292 is programmable for data rates up to 10Mbps by using a single external resistor.

The MAX3291/MAX3292 are full-duplex devices that operate from a single +5V supply and offer a low-current shutdown mode that reduces supply current to 100nA. They feature driver output short-circuit current limiting and a fail-safe receiver input that guarantees a logic-high output if the input is open circuit. A 1/4-unit-load receiver input impedance allows up to 128 transceivers on the bus.

Data Sheet

Download	Rev 1	(PDF, 296kB)
E-Mail

Key Features

Preemphasis Increases the Distance and Data Rate of Reliable RS-485/RS-422 Communication
Data Rate
- Optimized for 5Mbps to 10Mbps (MAX3291)
- Programmable up to 10Mbps (MAX3292)
100nA Low-Current Shutdown Mode
Allow Up to 128 Transceivers on the Bus
-7V to +12V Common-Mode Input Voltage Range
Pin-Compatible with '75180, MAX489, MAX491 MAX3080, MAX3083, MAX3086, MAX1482

Applications/Uses

Industrial Control Local Area Networks
Long-Distance, High-Speed RS-485/RS-422 Communications
Telecommunications

Key Specifications:

RS-422/485 Line Driver/Receivers

Part Number

Tx/Rx

Duplex

V_SUPPLY
(V)

I_CC
(mA)

Data Rate
(kbps)

Tx EN

Rx EN

I_CC (Shutdn.)
(µA)

Rx/Tx on Bus

Package/Pins

Budgetary Price

typ

min

typ

See Notes

MAX3291

1Tx + 1Rx

Full

10000

Yes

0.1

128

MAX3292

See All RS-422/485 Line Driver/Receivers (165)

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Diagram

Typical Operating Circuit

Application Notes

Application Note 643

Pre-Emphasis Improves RS-485 Communications

Product Guides

Interface (PDF)

Reliability Reports

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Software/Models

none

Ordering Information

Filters:

Part Number:

Package:

Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX3291CPD			Active	PDIP(N);14 pin;160.5 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P14-7*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX3291CPD+			Active	PDIP(N);14 pin;160.5 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P14+7*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX3291CSD			Active	SOIC(N);14 pin;54.3 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0112 (PDF) Use pkgcode/variation: S14-5*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX3291CSD+			Active	SOIC(N);14 pin;54.3 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0112 (PDF) Use pkgcode/variation: S14+5*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX3291CSD+T			Active	SOIC(N);14 pin;54.3 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0112 (PDF) Use pkgcode/variation: S14+5*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX3291CSD-T			Active	N.SO;14 pin Land Pattern: Not Available	0°C to +70°C	See data sheet
MAX3291EPD			Active	PDIP(N);14 pin;160.5 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P14-7*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX3291EPD+			Active	PDIP(N);14 pin;160.5 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P14+7*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX3291ESD			Active	SOIC(N);14 pin;54.3 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0112 (PDF) Use pkgcode/variation: S14-5*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX3291ESD+			Active	SOIC(N);14 pin;54.3 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0112 (PDF) Use pkgcode/variation: S14+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX3291ESD+T			Active	SOIC(N);14 pin;54.3 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0112 (PDF) Use pkgcode/variation: S14+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX3291ESD-T			Active	N.SO;14 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX3292CPD			Active	PDIP(N);14 pin;160.5 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P14-7*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX3292CPD+			Active	PDIP(N);14 pin;160.5 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P14+7*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX3292CSD			Active	SOIC(N);14 pin;54.3 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0112 (PDF) Use pkgcode/variation: S14-5*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX3292CSD-T			Active	N.SO;14 pin Land Pattern: Not Available	0°C to +70°C	See data sheet
MAX3292EPD			Active	PDIP(N);14 pin;160.5 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P14-7*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX3292EPD+			Active	PDIP(N);14 pin;160.5 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P14+7*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX3292ESD			Active	SOIC(N);14 pin;54.3 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0112 (PDF) Use pkgcode/variation: S14-5*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX3292ESD-G02			Active	N.SO; Land Pattern: Not Available	-40°C to +85°C	See data sheet
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX3292ESD-T			Active	SOIC(N);14 pin;54.3 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0112 (PDF) Use pkgcode/variation: S14-5*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX3292ESD-TG02			Active	N.SO; Land Pattern: Not Available	-40°C to +85°C	See data sheet

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Notes and Comments

PreEmphasis Transmitter increases usable max cable length

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Information Index

Overview		Technical Documents		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Application Notes Evaluation Kits Product Guides Reliability Reports Software/Models		Price and Availability Samples Buy Online Package Information Lead-Free Information		Similar Products by Function Similar Products by Application Evaluation Kits Products with Similar Part Numbers Products Used With This

Document Ref.: 19-1405 Rev 1; 1999-04-01
This page last modified: 2007-07-20