Maxim > Products > Digital Potentiometers > MAX5477, MAX5478, MAX5479

MAX5477, MAX5478, MAX5479

Dual, 256-Tap, Nonvolatile, I²C-Interface, Digital Potentiometers

Industry's Smallest, Dual, 256-Tap Digital Potentiometers Fit in 3mm x 3mm TQFN

Overview

Technical Documents

Ordering Info

Status

Part Number	Status
MAX5477	Active: In Production. See Ordering Information for details.
MAX5478	Active: In Production. See Ordering Information for details.
MAX5479	Active: In Production. See Ordering Information for details.

Description

The MAX5477/MAX5478/MAX5479 nonvolatile, dual, linear-taper, digital potentiometers perform the function of a mechanical potentiometer, but replace the mechanics with a simple 2-wire digital interface. Each device performs the same function as a discrete potentiometer or variable resistor and has 256 tap points.

The devices feature an internal, nonvolatile EEPROM used to store the wiper position for initialization during power-up. A write-protect feature prevents accidental overwrites of the EEPROM. The fast-mode I²C-compatible serial interface allows communication at data rates up to 400kbps, minimizing board space and reducing interconnection complexity in many applications. Three address inputs allow a total of eight unique address combinations.

The MAX5477/MAX5478/MAX5479 provide three nominal resistance values: 10kΩ (MAX5477), 50kΩ (MAX5478), or 100kΩ (MAX5479). The nominal resistor temperature coefficient is 70ppm/°C end-to-end and 10ppm/°C ratiometric. The low temperature coefficient makes the devices ideal for applications requiring a low temperature- coefficient variable resistor, such as low drift, programmable gain-amplifier circuit configurations.

The MAX5477/MAX5478/MAX5479 are available in 16-pin 3mm x 3mm x 0.8mm TQFN and 14-pin 4.4mm x 5mm TSSOP packages. These devices operate over the extended -40°C to +85°C temperature range.

Data Sheet

Download	Rev 5	(PDF, 313.3kB)
E-Mail

An evaluation kit is available: MAX5478EVCMODU, MAX5478EVKIT

Key Features

Power-On Recall of Wiper Position from Nonvolatile Memory
EEPROM Write Protection
Tiny 3mm x 3mm x 0.8mm Thin QFN Package
70ppm/°C End-to-End Resistance Temperature Coefficient
10ppm/°C Ratiometric Temperature Coefficient
Fast 400kbps I²C-Compatible Serial Interface
1µA (max) Static Supply Current
Single-Supply Operation: +2.7V to +5.25V
256 Tap Positions per Potentiometer
±0.5 LSB DNL in Voltage-Divider Mode
±1 LSB INL in Voltage-Divider Mode

Applications/Uses

Liquid-Crystal Display (LCD) Contrast Control
Low-Drift Programmable-Gain Amplifiers
Mechanical Potentiometer Replacements
Volume Control

Key Specifications:

Digital Potentiometers

Part Number

Taper

POTs

Control Interface

Wiper Memory

Steps

R_END-TO-END
(kΩ)

Res. Tol.
(%)

Temp. Coeff.
(ppm/°C)

Wiper Resistance
(Ω)

I_CC @5V
(µA)

Smallest Available Pckg.
(mm²)

Budgetary Price

typ

max

max w/pins

See Notes

MAX5477

Linear

2-Wire Serial

Non-Volatile

256

325

9.6

$1.60 @1k

MAX5478

$1.60 @1k

MAX5479

100

$1.60 @1k

See All Digital Potentiometers (129)

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

Functional Diagram

Application Notes

Application Note 3996		Logging the Linear Digital Potentiometer
Application Note 4051		Using an Analog Voltage to Control a Digital Potentiometer
Tutorial 4703		Introduction to Electronic Calibration and Methods for Correcting Manufacturing Tolerances in Medical Equipment Designs
Tutorial 4704		Introduction to Electronic Calibration and Methods for Correcting Manufacturing Tolerances in Industrial Equipment Designs
Tutorial 4993		Reduce the Chances of Human Error: Part 2, Super Amps and Filters for Analog Interface

Product Guides

Signal Chain (PDF)

Reliability Reports

Reliability Report:	MAX5477.pdf MAX5478.pdf MAX5479.pdf
Show FIT data for:

Software/Models

none

Ordering Information

Filters:

Part Number:

Package:

Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX5477ETE#G16		N/A	No Longer Available	MAX5477ETE+	TQFN;16 pin;9.6 mm² Outline Drawing:21-0136 (PDF) Land Pattern: 90-0033 (PDF) Use pkgcode/variation: T1633FH-3*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX5477ETE#TG16		N/A	No Longer Available	MAX5477ETE+	QFN; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX5477ETE+			Active		TQFN;16 pin;9.6 mm² Outline Drawing:21-0136 (PDF) Land Pattern: 90-0033 (PDF) Use pkgcode/variation: T1633F+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX5477ETE+T			Active		TQFN;16 pin;9.6 mm² Outline Drawing:21-0136 (PDF) Land Pattern: 90-0033 (PDF) Use pkgcode/variation: T1633F+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX5477EUD+			Active		TSSOP;14 pin;33.4 mm² Outline Drawing:21-0066 (PDF) Land Pattern: 90-0113 (PDF) Use pkgcode/variation: U14+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX5477EUD+T			Active		TSSOP;14 pin;33.4 mm² Outline Drawing:21-0066 (PDF) Land Pattern: 90-0113 (PDF) Use pkgcode/variation: U14+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX5478ETE			Active		TQFN;16 pin;9.6 mm² Outline Drawing:21-0136 (PDF) Land Pattern: 90-0033 (PDF) Use pkgcode/variation: T1633F-3*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX5478ETE#G16		N/A	No Longer Available	MAX5478ETE+	TQFN;16 pin;9.6 mm² Outline Drawing:21-0136 (PDF) Land Pattern: 90-0033 (PDF) Use pkgcode/variation: T1633FH-3*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX5478ETE#TG16		N/A	No Longer Available	MAX5478ETE+	TQFN;16 pin;9.6 mm² Outline Drawing:21-0136 (PDF) Land Pattern: 90-0033 (PDF) Use pkgcode/variation: T1633FH-3*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX5478ETE+			Active		TQFN;16 pin;9.6 mm² Outline Drawing:21-0136 (PDF) Land Pattern: 90-0033 (PDF) Use pkgcode/variation: T1633F+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
Part Number	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX5478ETE+T			Active		TQFN;16 pin;9.6 mm² Outline Drawing:21-0136 (PDF) Land Pattern: 90-0033 (PDF) Use pkgcode/variation: T1633F+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX5478ETE-T			Active		TQFN;16 pin;9.6 mm² Outline Drawing:21-0136 (PDF) Land Pattern: 90-0033 (PDF) Use pkgcode/variation: T1633F-3*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX5478EUD			Active		TSSOP;14 pin;33.4 mm² Outline Drawing:21-0066 (PDF) Land Pattern: 90-0113 (PDF) Use pkgcode/variation: U14-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX5478EUD+			Active		TSSOP;14 pin;33.4 mm² Outline Drawing:21-0066 (PDF) Land Pattern: 90-0113 (PDF) Use pkgcode/variation: U14+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX5478EUD+T			Active		TSSOP;14 pin;33.4 mm² Outline Drawing:21-0066 (PDF) Land Pattern: 90-0113 (PDF) Use pkgcode/variation: U14+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX5478EUD-T			Active		TSSOP;14 pin;33.4 mm² Outline Drawing:21-0066 (PDF) Land Pattern: 90-0113 (PDF) Use pkgcode/variation: U14-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX5479ETE			Active		TQFN;16 pin;9.6 mm² Outline Drawing:21-0136 (PDF) Land Pattern: 90-0033 (PDF) Use pkgcode/variation: T1633F-3*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX5479ETE#G16		N/A	No Longer Available	MAX5479ETE+	TQFN;16 pin;9.6 mm² Outline Drawing:21-0136 (PDF) Land Pattern: 90-0033 (PDF) Use pkgcode/variation: T1633FH-3*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX5479ETE#TG16		N/A	No Longer Available	MAX5479ETE+	QFN; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX5479ETE+			Active		TQFN;16 pin;9.6 mm² Outline Drawing:21-0136 (PDF) Land Pattern: 90-0033 (PDF) Use pkgcode/variation: T1633F+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
Part Number	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX5479ETE+T			Active		TQFN;16 pin;9.6 mm² Outline Drawing:21-0136 (PDF) Land Pattern: 90-0033 (PDF) Use pkgcode/variation: T1633F+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX5479ETE-T			Active		QFN;16 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX5479EUD			Active		TSSOP;14 pin;33.4 mm² Outline Drawing:21-0066 (PDF) Land Pattern: 90-0113 (PDF) Use pkgcode/variation: U14-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX5479EUD+			Active		TSSOP;14 pin;33.4 mm² Outline Drawing:21-0066 (PDF) Land Pattern: 90-0113 (PDF) Use pkgcode/variation: U14+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX5479EUD+T			Active		TSSOP;14 pin;33.4 mm² Outline Drawing:21-0066 (PDF) Land Pattern: 90-0113 (PDF) Use pkgcode/variation: U14+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX5479EUD-T			Active		TSSOP;14 pin 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.

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Evaluation Kits

MAX5478EVCMODU, MAX5478EVKIT

Evaluation Kit/Evaluation System for the MAX5477, MAX5478, and MAX5479

Products with Similar Part Numbers

MAX5478EVCMODU, MAX5478EVKIT

Evaluation Kit/Evaluation System for the MAX5477, MAX5478, and MAX5479

More Information

Topmark Coding	MAX5477
Topmark Coding	MAX5478
Topmark Coding	MAX5479
New Product Press Release	[ 2005-03-21 ] [ 2004-08-14 ]

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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.: 19-3379 Rev 5; 2012-01-30
This page last modified: 2012-01-31

Dual, 256-Tap, Nonvolatile, I²C-Interface, Digital Potentiometers

Status

Description

Data Sheet

Key Features

Applications/Uses

Key Specifications:

Diagram

Application Notes

Product Guides

Reliability Reports

Software/Models

Ordering Information

Similar Products by Function

Similar Products by Application

Evaluation Kits

Products with Similar Part Numbers

More Information

Didn't Find What You Need?

Information Index

Overview

Technical Documents

Ordering Info

Related Products