MAX5427 Datasheet, PDF (1/10 Pages) Maxim Integrated Products – One-Time Programmable, Linear-Taper Digital Potentiometers

19-2462; Rev 1; 7/02
EVAALVUAAILTAIOBNLEKIT
One-Time Programmable, Linear-Taper
Digital Potentiometers
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
Pin Configurations
TOP VIEW
W₁
CS ₂
V_{DD 3}
GND ₄
MAX5427
MAX5428
MAX5429
8^H
7^L
6 ^U/D
5 ^VPP
µMAX
*
W₁
8^H
CS ₂
7^L
V_{DD 3}
GND ₄
MAX5427
MAX5428
MAX5429
*
QFN
6 ^U/D
5 ^VPP
*EXPOSED PADDLE. CONNECTED TO GND.
Features
o Wiper Position Stored After One-Time Fuse
Programming
o User-Defined Power-On Reset Position
o 35ppm/°C End-to-End Temperature Coefficient
and 5ppm/°C Ratiometric Temperature Coefficient
o 32 Tap Positions
o Tiny 8-Pin Thin QFN and µMAX Packages
o Ultra-Low 1.5µA (max) Static Supply Current
o 2.7V to 5.5V Single-Supply Operation
o Wiper Position Programmed Through Simple
2-Wire Serial Interface
o 10kΩ, 50kΩ, and 100kΩ End-to-End Resistances
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX5427EUA -40°C to +85°C 8 µMAX
MAX5427ETA -40°C to +85°C 8 Thin QFN-EP*
MAX5428EUA -40°C to +85°C 8 µMAX
MAX5428ETA -40°C to +85°C 8 Thin QFN-EP*
MAX5429EUA -40°C to +85°C 8 µMAX
MAX5429ETA -40°C to +85°C 8 Thin QFN-EP*
*EP = Exposed paddle.
R (kΩ)
100
100
50
50
10
10
Functional Block Diagram
VDD ³
GND ⁴
MAX5427
MAX5428
MAX5429
2
CS
6
U/D
VPP ⁵
UP/DOWN
COUNTER
ONE-TIME
PROGRAM
BLOCK
H
8
R31
R30
32-
POSITION
DECODER
R2
R1
7
L
S32
S31
S30 _RW
S3
1
W
S2
S1
________________________________________________________________ Maxim Integrated Products 1
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.