MAX5427 MAXIM [Maxim Integrated Products], MAX5427 Datasheet

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MAX5427

Manufacturer Part Number
MAX5427
Description
One-Time Programmable, Linear-Taper Digital Potentiometers
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet

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Part Number:
MAX5427EUA+T
Manufacturer:
MAXIM
Quantity:
8
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 100k ,
the MAX5428 a resistance of 50k , and the MAX5429 a
resistance of 10k . 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.
19-2462; Rev 1; 7/02
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.
Mechanical Potentiometer Replacement
Products Using One-Time Factory Calibration
TOP VIEW
GND
GND
V
V
CS
DD
CS
DD
W
W
*EXPOSED PADDLE. CONNECTED TO GND.
________________________________________________________________ Maxim Integrated Products
1
2
4
3
1
2
4
3
One-Time Programmable, Linear-Taper
General Description
MAX5427
MAX5428
MAX5429
MAX5427
MAX5428
MAX5429
Pin Configurations
QFN
MAX
*
*
Applications
6
6
8
7
5
8
7
5
H
L
U/D
V
H
L
U/D
V
PP
PP
o Wiper Position Stored After One-Time Fuse
o User-Defined Power-On Reset Position
o 35ppm/°C End-to-End 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
o 10k , 50k , and 100k End-to-End Resistances
*EP = Exposed paddle.
Digital Potentiometers
MAX5427EUA
MAX5427ETA
MAX5428EUA
MAX5428ETA
MAX5429EUA
MAX5429ETA
GND
V
U/D
V
CS
DD
PP
Programming
and 5ppm/°C Ratiometric Temperature Coefficient
2-Wire Serial Interface
PART
3
4
2
6
5
MAX5427
MAX5428
MAX5429
Functional Block Diagram
PROGRAM
UP/DOWN
ONE-TIME
COUNTER
BLOCK
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
Ordering Information
DECODER
POSITION
32-
PIN-PACKAGE
8 µMAX
8 Thin QFN-EP*
8 µMAX
8 Thin QFN-EP*
8 µMAX
8 Thin QFN-EP*
7
8
H
L
R
R
R
R
31
30
2
1
Features
S
S
S
S
S
S
32
31
30
3
2
1
R
W
R (k )
100
100
1
50
50
10
10
W
1

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MAX5427 Summary of contents

Page 1

... The MAX5427 has an end-to-end resistance of 100k , the MAX5428 a resistance of 50k , and the MAX5429 a resistance of 10k . All these devices have 32 wiper positions, operate from a single 2.7V to 5.5V supply, and use less than 1.5µ ...

Page 2

... All Other Pins to GND.................................-0. Input and Output Latchup Immunity...............................±200mA Maximum Continuous Current into H, L, and W MAX5427 .................................................................±1.5mA MAX5428 .................................................................±1.5mA MAX5429 .................................................................±2.0mA 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 ...

Page 3

One-Time Programmable, Linear-Taper ELECTRICAL CHARACTERISTICS (continued 2.7V to 5.5V GND 5.0V +25°C, unless otherwise noted.) (Note 1) A PARAMETER SYMBOL U/D Step High Time Wiper Switching Time Rising ...

Page 4

... R-INL ERROR vs. INPUT CODE (MAX5427) 0.10 0.08 0.06 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -0. INPUT CODE (DECIMAL) W-TO-L RESISTANCE vs. TAP POSITION 100 MAX5427 60 MAX5428 MAX5429 TAP POSITION WIPER TRANSIENT AT POWER- 2V/div OUTPUT W 1V/div 2 s/div R-DNL ERROR vs. INPUT CODE (MAX5428) ...

Page 5

... POR position of the wiper. The 2-wire interface can then be disabled, perma- nently preventing unwanted adjustment. Digital Interface Operation The MAX5427/MAX5428/MAX5429 have two modes of operation when the serial interface is active: increment _______________________________________________________________________________________ Digital Potentiometers Typical Operating Characteristics (continued) R-DNL ERROR vs ...

Page 6

One-Time Programmable, Linear-Taper Digital Potentiometers U Figure 2. Increment Mode Serial Interface Timing Diagram U Figure 3. Decrement Mode Serial Interface Timing Diagram ...

Page 7

... Digital Potentiometers BITS RECORD WIPER POSITION V = 11V Figure 5. V power PP TRANSISTOR COUNT: 2270 of parasitic resis- PROCESS: BiCMOS OPTIONAL LOCKOUT BIT TRACE PARASITICS PARASITIC PARASITIC < 250 H < 40 MAX5427 MAX5428 MAX5429 Power-Supply Connection PP Chip Information 7 ...

Page 8

One-Time Programmable, Linear-Taper Digital Potentiometers (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) 8 _______________________________________________________________________________________ Package Information PACKAGE OUTLINE & 10L, QFN THIN ...

Page 9

One-Time Programmable, Linear-Taper (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) COMMON DIMENSIONS SYMBOL MIN. MAX. A 0.70 0.80 D 2.90 3.10 E 2.90 3.10 ...

Page 10

One-Time Programmable, Linear-Taper Digital Potentiometers (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages ÿ 0.50±0.1 0.6±0.1 1 0.6±0.1 D TOP VIEW A1 ...

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