Rainbow Electronics MAX5475 User Manual

General Description

The MAX5471/MAX5472/MAX5474/MAX5475 linear­taper digital potentiometers function as mechanical
potentiometers, but replace the mechanics with a sim­ple 3-wire up/down digital interface. These digital
potentiometers feature nonvolatile memory (EEPROM)
to return the wiper to its previously stored position upon
power-up.

The MAX5471/MAX5472 are 2-terminal, variable resistors
in 6-pin SOT23 packages. The MAX5474/MAX5475 are
3-terminal potentiometers in 8-pin SOT23 packages.

The MAX5471/MAX5474 have an end-to-end resistance
of 50kΩ, and the MAX5472/MAX5475 have an end­to-end resistance of 100kΩ. All of these devices have
32 wiper positions, a low ratiometric temperature coeffi­cient (5ppm/°C), and all operate from a single +2.7V to
+5.25V supply. Each device is guaranteed over the
extended -40°C to +85°C temperature range.

Applications

Mechanical Potentiometer Replacement

Liquid-Crystal-Display (LCD) Screen Adjustment

Audio Volume Control

Programmable Filters

Features

♦ Wiper Position Stored in Nonvolatile Memory and

Recalled Upon Power-Up

♦ Tiny SOT23 Package

♦ 35ppm/°C End-to-End Resistance Temperature

Coefficient

♦ 5ppm/°C Ratiometric Temperature Coefficient

♦ 32 Tap Positions

♦ Voltage-Divider or Variable-Resistor

Potentiometer Configuration

♦ 50kΩ and 100kΩ End-to-End Resistance Values

♦ 1µA (max) Static Supply Current

♦ 2.7V to 5.25V Single-Supply Operation

♦ 200,000 Wiper Store Cycles

♦ 50-Year Wiper Data Retention

MAX5471/MAX5472/MAX5474/MAX5475

32-Tap, Nonvolatile, Linear-Taper Digital

Potentiometers in SOT23

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-3067; Rev 0; 10/03

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.

Pin Configurations

Selector Guide

PART TEMP RANGE PIN-PACKAGE

MAX5471EZT-T -40°C to +85°C 6 Thin SOT23-6
MAX5472EZT-T -40°C to +85°C 6 Thin SOT23-6
MAX5474EKA-T -40°C to +85°C 8 SOT23-8
MAX5475EKA-T -40°C to +85°C 8 SOT23-8

TOP VIEW

CS

GND

U/D

1

2

3

MAX5471
MAX5472

SOT23-6

PART

MAX5471EZT 50 ABQN

V

6

DD

H

5

INC

4

V

GND

U/D

1

CS

2

DD

3

MAX5474

4

MAX5475

SOT23-8

L

8

7

W

H

6

5

INC

MAX5472EZT 100 ABQM

MAX5474EKA 50 AEIZ

MAX5475EKA 100 AEIY

END-TO-END

RESISTANCE (kΩ)

TOP MARK

MAX5471/MAX5472/MAX5474/MAX5475

32-Tap, Nonvolatile, Linear-Taper Digital
Potentiometers in SOT23

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VDD= +2.7V to +5.25V, VH= VDD, VL= GND, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VDD= +5.0V, T

A

= +25°C, unless otherwise noted.) (Note 1)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

VDDto GND...........................................................-0.3V to +6.0V

All Other

Pins to GND .........-0.3V to the lower of (V

DD

+ 0.3V) or +6.0V

Maximum Continuous Current into H, L, and W

MAX5471/MAX5474 .....................................................±1.3mA

MAX5472/MAX5475 .....................................................±0.6mA

Continuous Power Dissipation (T

A

= +70°C)

6-Pin SOT23 (derate 9.1mW/°C above +70°C)............727mW

8-Pin SOT23 (derate 8.9mW/°C above +70°C)............714mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-60°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

DC PERFORMANCE

Resolution N 32 Tap

End-to-End Resistance

End-to-End Resistance
Temperature Coefficient

Ratiometric Resistance
Temperature Coefficient

Integral Nonlinearity INL

Differential Nonlinearity DNL

Full-Scale Error MAX5474/MAX5475 -0.5 LSB

Zero-Scale Error MAX5474/MAX5475 +0.5 LSB

Wiper Resistance R
DIGITAL INPUTS (CS, U/D, INC) (Note 5)

Input High Voltage V

Input Low Voltage V

Input Current I

DYNAMIC CHARACTERISTICS

Wiper -3dB Bandwidth (Note 6)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

MAX5471/MAX5474 37.5 50 62.5

MAX5472/MAX5475 75 100 125

TC

R

Variable-resistor mode (Note 2) ±0.5 ±1.0

Voltage-divider mode (MAX5474/MAX5475)
(Note 3)

Variable-resistor mode (Note 2) ±0.5 ±1.0

Voltage-divider mode (MAX5474/MAX5475)
(Note 3)

MAX5474/MAX5475 (Note 4) 600 1200 Ω

W

VDD < 3.6V 0.7 x V

IH

VDD ≥ 3.6V 2.4

VDD < 3.6V 0.3 x V

IL

VDD ≥ 3.6V 0.8

IN

MAX5471/MAX5474 400

MAX5472/MAX5475 200

35 ppm/°C

5 ppm/°C

±0.1 ±0.5

±0.1 ±0.5

DD

±0.1 ±1 µA

DD

kΩ

LSB

LSB

V

V

kHz

MAX5471/MAX5472/MAX5474/MAX5475

32-Tap, Nonvolatile, Linear-Taper Digital

Potentiometers in SOT23

_______________________________________________________________________________________ 3

Note 1: All devices are production tested at TA= +25°C and are guaranteed by design and characterization for -40°C < TA< +85°C.
Note 2: The DNL and INL are measured with the potentiometer configured as a variable resistor. For the 3-terminal potentiometers

(MAX5474/MAX5475), H is unconnected and L = GND. At V

DD

= 5.25V, W is driven with a source current of 80µA for the

50kΩ configuration, and 40µA for the 100kΩ configuration. At V

DD

= 2.7V, the wiper terminal is driven with a source current

of 40µA for the 50kΩ configuration, and 20µA for the 100kΩ configuration.

Note 3: The DNL and INL are measured with the potentiometer configured as a voltage-divider with H = V

DD

and L = GND

(MAX5474/MAX5475 only). The wiper terminal is unloaded.

Note 4: The wiper resistance is the worst value measured by injecting the currents given in Note 2 into W with L = GND.

R

W

= (VW- VH) / IW.

Note 5: The device draws higher supply current when digital inputs are driven with voltages between 0.3V x V

DD

and 0.7 x VDD.

Drive the digital inputs as close as possible to V

DD

or GND. (See the Typical Operating Characteristics for the Supply

Current vs. Digital Input Voltage graph.)

Note 6: Wiper at midscale with a 10pF load.
Note 7: Digital timing is guaranteed by design and characterization, and is not production tested.
Note 8: Wiper settling time is the worst-case 0% to 50% rise time measured between consecutive wiper positions. H = V

DD

, L =
GND, and the wiper terminal is unloaded and measured with a 10pF oscilloscope probe (see the Typical Operating
Characteristics for the Tap-to-Tap Switching Transient).

Note 9: Digital inputs CS, U/D, and INC are connected to GND or V

DD

. See the Typical Operating Characteristics for the Static

Supply Current vs. Temperature graph.

ELECTRICAL CHARACTERISTICS (continued)

(VDD= +2.7V to +5.25V, VH= VDD, VL= GND, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VDD= +5.0V, T

A

= +25°C, unless otherwise noted.) (Note 1)

TIMING CHARACTERISTICS (Figure 1, Note 7)

CS to INC Setup t
INC High to U/D Change t
U/D to INC Setup t
INC Low Period t
INC High Period t
INC Cycle Time t
INC Inactive to CS Inactive t
INC Active to CS Inactive t
CS Deselect Time (Store) t

Wiper Settling Time t

Power-Up to Wiper Stable t

Wiper Store Cycle t

NONVOLATILE MEMORY RELIABILITY

Data Retention TA = +85°C 50 Year

Endurance TA = +85°C 200,000 Store

POWER SUPPLY

Supply Voltage V

Supply Current I

Static Supply Current I

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

CI

ID

DI

IL

IH

CYC

IC

IK

CPH

IW

PU

WSC

DD

DD

SD

(Note 8) 1 µs

Write to memory 400 µA

TA = +25°C (Note 9) 0.35 1 µA

50 ns

0ns

100 ns

50 ns

50 ns

100 ns

100 ns

100 ns

100 ns

1µs

12 ms

2.70 5.25 V

MAX5471/MAX5472/MAX5474/MAX5475

32-Tap, Nonvolatile, Linear-Taper Digital
Potentiometers in SOT23

4 _______________________________________________________________________________________

Typical Operating Characteristics

(VDD= 5.0V, TA= +25°C, unless otherwise noted.)

SUPPLY CURRENT vs. SUPPLY VOLTAGE

MAX5471 toc01

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (µA)

5.14.74.33.93.53.1

0.1

0.2

0.3

0.4

0.5

0

2.7 5.5

DIGITAL INPUTS = GND OR V

DD

STATIC SUPPLY CURRENT

vs. TEMPERATURE

MAX5471 toc02

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

603510-15

0.1

0.2

0.3

0.4

0.5

0

-40 85

DIGITAL INPUTS = GND OR V

DD

VDD = 5.0V

VDD = 3.0V

SUPPLY CURRENT

vs. DIGITAL INPUT VOLTAGE

MAX5471 toc03

DIGITAL INPUT VOLTAGE (V)

SUPPLY CURRENT (µA)

4321

1

10

100

1000

10,000

0.1
05

VDD = 5.0V

VDD = 3.0V

WIPER RESISTANCE

vs. TAP POSITION (MAX5474)

MAX5471 toc04

TAP POSITION

WIPER RESISTANCE (Ω)

252051015

250

300

350

400

450

500

550

600

200

030

VDD = 3.0V

VDD = 5.0V

WIPER RESISTANCE

vs. TAP POSITION (MAX5475)

MAX5471 toc05

TAP POSITION

WIPER RESISTANCE (Ω)

252051015

250

300

350

400

450

500

550

600

200

030

VDD = 3.0V

VDD = 5.0V

END-TO-END RESISTANCE % CHANGE

vs. TEMPERATURE

MAX5471 toc06

TEMPERATURE (°C)

END-TO-END RESISTANCE % CHANGE

6035-15 10

-0.15

-0.10

-0.05

0

0.05

0.10

0.15

0.20

-0.20

-40 85

100kΩ

100kΩ

50kΩ

50kΩ

W-TO-L RESISTANCE

vs. TAP POSITION

MAX5471 toc07

TAP POSITION

W-TO-L RESISTANCE (kΩ)

252015105

20

40

60

80

100

0

030

MAX5475

MAX5474

H-TO-GND RESISTANCE

vs. TAP POSITION

MAX5471 toc08

TAP POSITION

H-TO-GND RESISTANCE (kΩ)

252015105

20

40

60

80

100

0

030

MAX5472

MAX5471

TAP-TO-TAP SWITCHING TRANSIENT

MAX5471 toc09

400ns/div

INC

5V/div

W

100mV/div

CL = 10pF
V

H

= V

DD

TAP 16 TO TAP 15

MAX5474

MAX5475