19-3067; Rev 1; 2/06
KIT
ATION
EVALU
BLE
AVAILA
32-Tap, Nonvolatile, Linear-Taper Digital
Potentiometers in SOT23
General Description
The MAX5471/MAX5472/MAX5474/MAX5475 linear-
taper digital potentiometers function as mechanical
potentiometers, but replace the mechanics with a sim-
ple 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 end-
to-end resistance of 100kΩ. All of these devices have
32 wiper positions, a low ratiometric temperature coeffi-
cient (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.
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
Applications
Mechanical Potentiometer Replacement
Liquid-Crystal-Display (LCD) Screen Adjustment
Audio Volume Control
Programmable Filters
Ordering Information
PART
MAX5471
EZT-T
MAX5472
EZT-T
TEMP
RANGE
PIN-PACKAGE
PKG
CODE
Z6-1
Z6-1
K8S-3
K8S-3
-40°C to +85°C 6 Thin SOT23-6
-40°C to +85°C 6 Thin SOT23-6
MAX5474
EKA-T -40°C to +85°C 8 SOT23-8
MAX5475
EKA-T -40°C to +85°C 8 SOT23-8
Pin Configurations
PART
TOP VIEW
Selector Guide
END-TO-END
RESISTANCE (kΩ)
50
100
50
100
TOP MARK
ABQN
ABQM
AEIZ
AEIY
MAX5471EZT
MAX5472EZT
CS 1
GND 2
U/D 3
6 V
DD
5 H
4 INC
CS 1
V
DD
2
GND 3
U/D 4
SOT23-6
8 L
7 W
6 H
MAX5474EKA
MAX5475EKA
MAX5471
MAX5472
MAX5474
MAX5475
SOT23-8
5 INC
________________________________________________________________
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.
32-Tap, Nonvolatile, Linear-Taper Digital
Potentiometers in SOT23
MAX5471/MAX5472/MAX5474/MAX5475
ABSOLUTE MAXIMUM RATINGS
V
DD
to 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
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.
ELECTRICAL CHARACTERISTICS
(V
DD
= +2.7V to +5.25V, V
H
= V
DD
, V
L
= GND, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
DD
= +5.0V, T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
DC PERFORMANCE
Resolution
End-to-End Resistance
End-to-End Resistance
Temperature Coefficient
Ratiometric Resistance
Temperature Coefficient
Variable-resistor mode (Note 2)
Integral Nonlinearity
INL
Voltage-divider mode (MAX5474/MAX5475)
(Note 3)
Variable-resistor mode (Note 2)
Differential Nonlinearity
Full-Scale Error
Zero-Scale Error
Wiper Resistance
R
W
DIGITAL INPUTS (CS, U/D,
INC)
(Note 5)
Input High Voltage
Input Low Voltage
Input Current
DYNAMIC CHARACTERISTICS
Wiper -3dB Bandwidth (Note 6)
MAX5471/MAX5474
MAX5472/MAX5475
400
200
kHz
V
IH
V
IL
I
IN
V
DD
< 3.6V
V
DD
≥
3.6V
V
DD
< 3.6V
V
DD
≥
3.6V
±0.1
0.7 x V
DD
2.4
0.3 x V
DD
0.8
±1
V
V
µA
DNL
Voltage-divider mode (MAX5474/MAX5475)
(Note 3)
MAX5474/MAX5475
MAX5474/MAX5475
MAX5474/MAX5475 (Note 4)
600
TC
R
N
MAX5471/MAX5474
MAX5472/MAX5475
32
37.5
75
50
100
35
5
±0.5
±0.1
±0.5
±0.1
±1.0
±0.5
±1.0
±0.5
-0.5
+0.5
1200
LSB
LSB
LSB
Ω
LSB
62.5
125
Tap
kΩ
ppm/°C
ppm/°C
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
32-Tap, Nonvolatile, Linear-Taper Digital
Potentiometers in SOT23
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V to +5.25V, V
H
= V
DD
, V
L
= GND, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
DD
= +5.0V, T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
CS
to
INC
Setup
INC
High to U/D Change
U/D to
INC
Setup
INC
Low Period
INC
High Period
INC
Cycle Time
INC
Inactive to
CS
Inactive
INC
Active to
CS
Inactive
CS
Deselect Time (Store)
Wiper Settling Time
Power-Up to Wiper Stable
Wiper Store Cycle
Data Retention
Endurance
POWER SUPPLY
Supply Voltage
Supply Current
Static Supply Current
V
DD
I
DD
I
SD
Write to memory
T
A
= +25°C (Note 9)
0.35
2.70
5.25
400
1
V
µA
µA
SYMBOL
t
CI
t
ID
t
DI
t
IL
t
IH
t
CYC
t
IC
t
IK
t
CPH
t
IW
t
PU
t
WSC
T
A
= +85°C
T
A
= +25°C
T
A
= +85°C
12
50
200,000
50,000
(Note 8)
CONDITIONS
MIN
50
0
100
50
50
100
100
100
100
1
1
TYP
MAX
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
µs
µs
ms
Year
Store
MAX5471/MAX5472/MAX5474/MAX5475
TIMING CHARACTERISTICS
(Figure 1, Note 7)
NONVOLATILE MEMORY RELIABILITY
Note 1:
All devices are production tested at T
A
= +25°C and are guaranteed by design and characterization for -40°C < T
A
< +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
= (V
W
- V
H
) / I
W
.
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 V
DD
.
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.
_______________________________________________________________________________________
3
32-Tap, Nonvolatile, Linear-Taper Digital
Potentiometers in SOT23
MAX5471/MAX5472/MAX5474/MAX5475
Typical Operating Characteristics
(V
DD
= 5.0V, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX5471 toc01
STATIC SUPPLY CURRENT
vs. TEMPERATURE
MAX5471 toc02
SUPPLY CURRENT
vs. DIGITAL INPUT VOLTAGE
MAX5471 toc03
0.5
DIGITAL INPUTS = GND OR V
DD
0.4
SUPPLY CURRENT (μA)
0.5
DIGITAL INPUTS = GND OR V
DD
10,000
0.4
SUPPLY CURRENT (μA)
V
DD
= 5.0V
0.3
1000
SUPPLY CURRENT (μA)
V
DD
= 5.0V
0.3
100
0.2
0.2
V
DD
= 3.0V
0.1
10
0.1
1
V
DD
= 3.0V
0
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
SUPPLY VOLTAGE (V)
0
-40
-15
10
35
60
85
TEMPERATURE (°C)
0.1
0
1
2
3
4
5
DIGITAL INPUT VOLTAGE (V)
WIPER RESISTANCE
vs. TAP POSITION (MAX5474)
MAX5471 toc04
WIPER RESISTANCE
vs. TAP POSITION (MAX5475)
MAX5471 toc05
END-TO-END RESISTANCE % CHANGE
vs. TEMPERATURE
END-TO-END RESISTANCE % CHANGE
0.15
0.10
0.05
0
-0.05
-0.10
-0.15
-0.20
-40
-15
50kΩ
100kΩ
100kΩ
MAX5471 toc06
600
550
WIPER RESISTANCE (Ω)
500
450
400
V
DD
= 3.0V
350
300
250
200
0
5
10
15
20
25
30
TAP POSITION
V
DD
= 5.0V
600
550
V
DD
= 3.0V
WIPER RESISTANCE (Ω)
500
450
V
DD
= 5.0V
400
350
300
250
200
0
5
10
15
20
25
30
TAP POSITION
0.20
50kΩ
10
35
60
85
TEMPERATURE (°C)
W-TO-L RESISTANCE
vs. TAP POSITION
MAX5471 toc07
H-TO-GND RESISTANCE
vs. TAP POSITION
MAX5471 toc08
TAP-TO-TAP SWITCHING TRANSIENT
INC
5V/div
MAX5471 toc09
100
100
MAX5475
60
H-TO-GND RESISTANCE (kΩ)
W-TO-L RESISTANCE (kΩ)
80
80
MAX5472
60
40
MAX5474
20
40
MAX5471
20
W
100mV/div
MAX5474
MAX5475
C
L
= 10pF
V
H
= V
DD
TAP 16 TO TAP 15
0
0
5
10
15
20
25
30
TAP POSITION
0
0
5
10
15
20
25
30
TAP POSITION
400ns/div
4
_______________________________________________________________________________________
32-Tap, Nonvolatile, Linear-Taper Digital
Potentiometers in SOT23
Typical Operating Characteristics (continued)
(V
DD
= 5.0V, T
A
= +25°C, unless otherwise noted.)
MAX5471/MAX5472/MAX5474/MAX5475
WIPER TRANSIENT AT POWER-ON
(MAX5474)
MAX5471 toc10
WIPER TRANSIENT AT POWER-ON
(MAX5475)
MAX5471 toc11
WIPER RESPONSE vs. FREQUENCY
TAP = 16
C
L
= 10pF
MAX5474
MAX5471toc12
0
-3
WIPER RESPONSE (dB)
-6
-9
-12
-15
-18
1
V
DD
5V/div
V
DD
5V/div
W
1V/div
C
L
= 10pF
TAP 16
V
H
= V
DD
1.0μs/div
W
1V/div
C
L
= 10pF
TAP 16
V
H
= V
DD
1.0μs/div
MAX5475
10
100
1000
FREQUENCY (kHz)
RESISTANCE DNL vs. TAP POSITION
(MAX5471)
MAX5471 toc13
RESISTANCE INL vs. TAP POSITION
(MAX5471)
MAX5471 toc14
RESISTANCE DNL vs. TAP POSITION
(MAX5472)
VARIABLE-RESISTOR MODE
0.2
RESISTANCE DNL
0.1
0
-0.1
-0.2
-0.3
MAX5471 toc15
0.3
VARIABLE-RESISTOR MODE
0.2
RESISTANCE DNL
0.1
0
-0.1
-0.2
-0.3
0
5
10
15
20
25
30
TAP POSITION
0.5
VARIABLE-RESISTOR MODE
0.4
RESISTANCE INL
0.3
0.2
0.1
0
-0.1
0
5
10
15
20
25
30
TAP POSITION
0.3
0
5
10
15
20
25
30
TAP POSITION
RESISTANCE INL vs. TAP POSITION
(MAX5472)
MAX5471 toc16
RESISTANCE DNL vs. TAP POSITION
(MAX5474)
MAX5471 toc17
RESISTANCE INL vs. TAP POSITION
(MAX5474)
VOLTAGE-DIVIDER MODE
0.03
0.02
RESISTANCE INL
0.01
0
-0.01
-0.02
-0.03
-0.04
MAX5471 toc18
0.5
VARIABLE-RESISTOR MODE
0.4
RESISTANCE INL
0.3
0.2
0.1
0
-0.1
0
5
10
15
20
25
30
TAP POSITION
0.04
VOLTAGE-DIVIDER MODE
0.03
0.02
RESISTANCE DNL
0.01
0
-0.01
-0.02
-0.03
-0.04
0
5
10
15
20
25
30
TAP POSITION
0.04
0
5
10
15
20
25
30
TAP POSITION
_______________________________________________________________________________________
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