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General Description

The MAX5427/MAX5428/MAX5429 linear-taper digital

potentiometers function as mechanical potentiometers,

but replace the mechanics with a simple 2-wire digital

interface. These digital potentiometers are unique in that

they have an optional one-time programmable feature

that either sets the wiper’s power-on reset (POR) posi-

tion to a user-defined value, or the wiper can be set and

the interface disabled to prevent further adjustment.

The MAX5427 has an end-to-end resistance of 100kΩ,

the MAX5428 a resistance of 50kΩ, and the MAX5429 a

resistance of 10kΩ. All these devices have 32 wiper

positions, operate from a single 2.7V to 5.5V supply, and

use less than 1.5µA (max) static supply current.

The MAX5427/MAX5428/MAX5429 are available in

8-pin thin QFN and µMAX

packages. Each device is

guaranteed over the extended temperature range of

-40°C to +85°C.

Applications

Mechanical Potentiometer Replacement

Products Using One-Time Factory Calibration

Features

♦ Wiper Position Stored After One-Time Fuse

Programming

♦ User-Defined Power-On Reset Position

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

and 5ppm/°C Ratiometric Temperature Coefficient

♦ 32 Tap Positions

♦ Tiny 8-Pin Thin QFN and µMAX Packages

♦ Ultra-Low 1.5µA (max) Static Supply Current

♦ 2.7V to 5.5V Single-Supply Operation

♦ Wiper Position Programmed Through Simple

2-Wire Serial Interface

♦ 10kΩ, 50kΩ, and 100kΩ End-to-End Resistances

MAX5427/MAX5428/MAX5429

One-Time Programmable, Linear-Taper

Digital Potentiometers

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

MAX5427

MAX5428

MAX5429

32-

POSITION

DECODER

UP/DOWN

COUNTER

ONE-TIME

PROGRAM

BLOCK

GND

U/D

Functional Block Diagram

19-2462; Rev 2; 3/05

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.

EVALUATION KIT

AVAILABLE

PART TEMP RANGE PIN-PACKAGE R (kΩ)

MAX5427EUA -40°C to +85°C 8 µMAX 100

MAX5427ETA -40°C to +85°C 8 Thin QFN-EP* 100

MAX5428EUA -40°C to +85°C 8 µMAX 50

MAX5428ETA -40°C to +85°C 8 Thin QFN-EP* 50

MAX5429EUA -40°C to +85°C 8 µMAX 10

MAX5429ETA -40°C to +85°C 8 Thin QFN-EP* 10

GND

µMAX

TOP VIEW

MAX5427

MAX5428

MAX5429

U/D

GND

*EXPOSED PADDLE. CONNECTED TO GND.

QFN

MAX5427

MAX5428

MAX5429

U/D

Pin Configurations

*EP = Exposed paddle.

µMax is a registered trademark of Maxim Integrated Products, Inc.

Summary of content (10 pages)

PAGE 1
9-2462; Rev 2; 3/05 KIT ATION EVALU BLE A IL A V A One-Time Programmable, Linear-Taper Digital Potentiometers The MAX5427/MAX5428/MAX5429 linear-taper digital potentiometers function as mechanical potentiometers, but replace the mechanics with a simple 2-wire digital interface.
PAGE 2
MAX5427/MAX5428/MAX5429 One-Time Programmable, Linear-Taper Digital Potentiometers ABSOLUTE MAXIMUM RATINGS VDD to GND ...........................................................-0.3V to +6.0V VPP to GND..........................................................-0.3V to +12.0V All Other Pins to GND.................................-0.3V to (VDD + 0.3V) Input and Output Latchup Immunity...............................±200mA Maximum Continuous Current into H, L, and W MAX5427 ...................................
PAGE 3
One-Time Programmable, Linear-Taper Digital Potentiometers (VDD = 2.7V to 5.5V, VPP = GND, VH = VDD, VL = GND, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VDD = 5.0V, TA = +25°C, unless otherwise noted.
PAGE 4
Typical Operating Characteristics (VDD = 5.0V, TA = +25°C, unless otherwise noted.) END-TO-END RESISTANCE PERCENT CHANGE vs. TEMPERATURE VDD = 3.3V 120 100 VDD = 5.0V 80 MAX5429 0 -0.1 MAX5427 90 1 2 3 4 80 70 MAX5427 60 MAX5428 50 40 30 20 MAX5428 -0.2 MAX5427-29 toc03 MAX5427-29 toc02 0.1 100 MAX5429 10 -0.3 0 5 0 -40 -15 10 35 85 60 0 5 10 15 20 25 TEMPERATURE (°C) TAP POSITION SUPPLY CURRENT vs.
PAGE 5
One-Time Programmable, Linear-Taper Digital Potentiometers R-DNL ERROR vs. INPUT CODE (MAX5429) 0.08 0.06 0.020 0.015 0.08 0.06 0.02 0 -0.02 0.04 R-INL (LSB) 0.010 R-DNL (LSB) R-INL (LSB) 0.04 0.10 MAX5427-29 toc11 0.025 MAX5427-29 toc10 0.10 R-INL ERROR vs. INPUT CODE (MAX5429) 0.005 0 -0.005 0.02 0 -0.02 -0.04 -0.010 -0.04 -0.06 -0.015 -0.06 -0.08 -0.020 -0.08 -0.10 -0.025 0 5 10 15 20 25 30 MAX5427-29 toc12 R-INL ERROR vs. INPUT CODE (MAX5428) -0.
PAGE 6
MAX5427/MAX5428/MAX5429 One-Time Programmable, Linear-Taper Digital Potentiometers VDD tUP CS tCU tCI tIL tIH tIC U/D tIW VW Figure 2. Increment Mode Serial Interface Timing Diagram VDD tUP CS tCU tCI tIH tIL tIC U/D tIW VW Figure 3. Decrement Mode Serial Interface Timing Diagram The value of the counter is then stored and the wiper position is maintained.
PAGE 7
One-Time Programmable, Linear-Taper Digital Potentiometers MAX5427/MAX5428/MAX5429 U/D 11V VPP 0V tCH tCL tCP tPH CS tPC OPTIONAL LOCKOUT BIT 5 BITS RECORD WIPER POSITION Figure 4. One-Time Program Mode Serial Interface Timing Diagram It is recommended that the user either use six CS pulses (convert to a fixed voltage-divider) or five pulses (program the initial power-up value of the device, but still be able to adjust the wiper).
PAGE 8
Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) 6, 8, &10L, DFN THIN.EPS MAX5427/MAX5428/MAX5429 One-Time Programmable, Linear-Taper Digital Potentiometers D2 D A2 PIN 1 ID N 0.35x0.35 b PIN 1 INDEX AREA E [(N/2)-1] x e REF. E2 DETAIL A e k A1 CL CL A L L e e PACKAGE OUTLINE, 6,8,10 & 14L, TDFN, EXPOSED PAD, 3x3x0.
PAGE 9
One-Time Programmable, Linear-Taper Digital Potentiometers COMMON DIMENSIONS MIN. MAX. D 0.70 2.90 0.80 3.10 E A1 2.90 0.00 3.10 0.05 L k 0.20 0.40 0.25 MIN. A2 0.20 REF. SYMBOL A PACKAGE VARIATIONS PKG. CODE N D2 E2 e JEDEC SPEC b [(N/2)-1] x e DOWNBONDS ALLOWED T633-1 6 1.50±0.10 2.30±0.10 0.95 BSC MO229 / WEEA 0.40±0.05 1.90 REF NO T633-2 6 1.50±0.10 2.30±0.10 0.95 BSC MO229 / WEEA 0.40±0.05 1.90 REF NO T833-1 8 1.50±0.10 2.30±0.10 0.65 BSC MO229 / WEEC 0.
PAGE 10
Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) 4X S 8 8 INCHES DIM A A1 A2 b E Ø0.50±0.1 H c D e E H 0.6±0.1 L 1 1 α 0.6±0.1 S BOTTOM VIEW D MIN 0.002 0.030 MAX 0.043 0.006 0.037 0.014 0.010 0.007 0.005 0.120 0.116 0.0256 BSC 0.120 0.116 0.198 0.188 0.026 0.016 6∞ 0∞ 0.0207 BSC 8LUMAXD.