19-3511; Rev 1; 12/04
32-Tap, Nonvolatile, I
2
C, Linear, Digital
Potentiometers
General Description
The MAX5432–MAX5435 nonvolatile, linear-taper, digi-
tal potentiometers perform the function of a mechanical
potentiometer, but replace the mechanics with a simple
2-wire serial interface. Each device performs the same
function as a discrete potentiometer or a variable resis-
tor and has 32 tap points.
The MAX5432–MAX5435 feature an internal, nonvolatile,
electrically erasable programmable read-only memory
(EEPROM) that returns the wiper to its previously stored
position at power-up. The fast-mode I
2
C
†
-compatible
serial interface allows communication at data rates up to
400kbps, minimizing board space and reducing inter-
connection complexity. Each device is available with
one of four factory-preset I
2
C addresses (see the
Selector Guide).
Use the MAX5432–MAX5435 in applications requiring
digitally controlled resistors. Two resistance values are
available (50kΩ and 100kΩ) in a voltage-divider or vari-
able resistor configuration. The nominal resistor temper-
ature coefficient is 35ppm/°C end-to-end, and only
5ppm/°C ratiometric, making the devices ideal for
applications requiring a low-temperature-coefficient
variable resistor such as low-drift, programmable-gain
amplifier circuit configurations.
The MAX5432/MAX5433 are available in a 3mm x 3mm 8-
pin TDFN package and the MAX5434/MAX5435 are avail-
able in a 6-pin thin SOT23 package. The MAX5432–
MAX5435 are specified over the extended (-40°C to
+85°C) temperature range.
Features
♦
Tiny 3mm x 3mm 8-Pin TDFN and 6-Pin Thin
SOT23 Packages
♦
Power-On Recall of Wiper Position from
Nonvolatile Memory
♦
35ppm/°C End-to-End Resistance Temperature
Coefficient
♦
5ppm/°C Ratiometric Temperature Coefficient
♦
50kΩ/100kΩ Resistor Values
♦
Fast 400kbps I
2
C-Compatible Serial Interface
♦
500nA (typ) Static Supply Current
♦
+2.7V to +5.25V Single-Supply Operation
♦
32 Tap Positions
♦
±0.15 LSB INL (typ), ±0.15 LSB DNL (typ)
MAX5432–MAX5435
Ordering Information
PART
MAX5432LETA
MAX5432META*
MAX5433LETA
MAX5433META*
MAX5434LEZT-T
MAX5434MEZT-T*
MAX5434NEZT-T*
MAX5434PEZT-T*
MAX5435LEZT-T
MAX5435MEZT-T*
MAX5435NEZT-T*
MAX5435PEZT-T*
TEMP RANGE
-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
-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
PIN-PACKAGE
8 TDFN-EP**
8 TDFN-EP**
8 TDFN-EP**
8 TDFN-EP**
6 Thin SOT23-6
6 Thin SOT23-6
6 Thin SOT23-6
6 Thin SOT23-6
6 Thin SOT23-6
6 Thin SOT23-6
6 Thin SOT23-6
6 Thin SOT23-6
Applications
Mechanical Potentiometer Replacement
Low-Drift Programmable-Gain Amplifiers
Volume Control
Liquid-Crystal Display (LCD) Screen Adjustment
*Future
product—contact factory for availability.
**EP
= Exposed pad.
Pin Configurations
Selector Guide appears at end of data sheet.
TOP VIEW
H 1
SDA 2
8 W
7 L
6 A0
MAX5432
MAX5433
5 V
DD
V
DD
1
GND 2
SCL 3
MAX5434
MAX5435
6
5
4
L
W
SDA
of
components from Maxim Integrated Products,
Inc., or one of its sublicensed Associated Companies, conveys
a license under the Philips I
2
C Patent Rights to use these com-
ponents in an I
2
C system, provided that the system conforms
to the I
2
C Standard Specification as defined by Philips.
†
Purchase
I
2
C
GND 3
SCL 4
SOT23
TDFN
________________________________________________________________
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, I
2
C, Linear, Digital
Potentiometers
MAX5432–MAX5435
ABSOLUTE MAXIMUM RATINGS
V
DD
to GND ...........................................................-0.3V to +6.0V
SDA, SCL to GND..................................................-0.3V to +6.0V
A0, H, L, and W to GND .............................-0.3V to (V
DD
+ 0.3V)
Maximum Continuous Current into H, L, and W
MAX5432/MAX5434.....................................................±1.3mA
MAX5433/MAX5435.....................................................±0.6mA
Input/Output Latchup Immunity........................................±50mA
Continuous Power Dissipation (T
A
= +70°C)
6-Pin Thin SOT23 (derate 9.1mW/°C above +70°C) ....727mW
8-Pin TDFN (derate 18.2mW/°C above +70°C) ......1454.5mW
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
= +5V, T
A
=
+25°C.) (Note 1)
PARAMETER
DC PERFORMANCE
Resolution
End-to-End Resistance
End-to-End Resistance
Temperature Coefficient
Ratiometric Resistance
Temperature Coefficient
Variable resistor (Note 2)
Integral Nonlinearity
INL
Voltage-divider,
MAX5432/MAX5433 (Note 3)
Variable resistor (Note 2)
Differential Nonlinearity
DNL
Voltage-divider,
MAX5432/MAX5433 (Note 3)
Full-Scale Error (Note 4)
Zero-Scale Error (Note 5)
Wiper Resistance
DIGITAL INPUTS
Input High Voltage
Input Low Voltage
Input Leakage Current
Input Capacitance
V
IH
V
IL
I
LEAK
5
(Note 7)
(Note 7)
0.7 x
V
DD
0.3 x
V
DD
±1
V
V
µA
pF
R
W
MAX5432, 50kΩ
MAX5433, 100kΩ
MAX5432, 50kΩ
MAX5433, 100kΩ
MAX5432/MAX5433 (Note 6)
610
V
DD
= 5V
V
DD
= 3V
V
DD
= 5V
V
DD
= 3V
V
DD
= 5V
V
DD
= 3V
V
DD
= 5V
V
DD
= 3V
R
H-L
TC
R
MAX5432/MAX5434
MAX5433/MAX5435
32
37.5
75
50
100
35
5
±0.15
±0.15
±0.15
±0.15
±0.15
±0.15
±0.15
±0.15
±0.5
±0.5
±0.5
±0.5
±0.5
±0.5
±0.5
±0.5
-0.5
-0.5
+0.5
+0.5
1200
LSB
LSB
Ω
LSB
LSB
62.5
125
Taps
kΩ
ppm/°C
ppm/°C
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
32-Tap, Nonvolatile, I
2
C, Linear, Digital
Potentiometers
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
= +5V, T
A
=
+25°C.) (Note 1)
PARAMETER
DYNAMIC CHARACTERISTICS
-3dB Bandwidth (Note 8)
Wiper Settling Time (Note 9)
NONVOLATILE MEMORY RELIABILITY
Data Retention
Endurance
POWER SUPPLY
Power-Supply Voltage
Standby Current
Programming Current
V
DD
I
DD
Digital inputs = V
DD
or GND, T
A
= +25°C
During nonvolatile write; digital inputs =
V
DD
or GND (Note 10)
2.70
0.5
200
5.25
2
900
V
µA
µA
T
A
= +85°C
T
A
= +25°C
T
A
= +85°C
50
200,000
50,000
Years
Stores
MAX5432/MAX5434
MAX5433/MAX5435
MAX5432/MAX5434
MAX5433/MAX5435
500
250
0.5
1.0
kHz
µs
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX5432–MAX5435
TIMING 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
= +5V, T
A
=
+25°C.) (Figures 1 and 2) (Note 11)
PARAMETER
SCL Clock Frequency
Setup Time for START Condition
Hold Time for START Condition
CLK High Time
CLK Low Time
Data Setup Time
Data Hold Time
SDA, SCL Rise Time
SDA, SCL Fall Time
Setup Time for STOP Condition
Bus Free Time Between STOP
and START Condition
Pulse Width of Spike Suppressed
Capacitive Load for Each Bus
Line
Nonvolatile Store Time
SYMBOL
f
SCL
t
SU-STA
t
HD-STA
t
HIGH
t
LOW
t
SU-DAT
t
HD-DAT
t
R
t
F
t
SU-STO
t
BUF
t
SP
C
B
(Note 12)
Idle time required after a nonvolatile
memory write (Note 13)
0.6
1.3
50
400
12
0.6
0.6
0.6
1.3
100
0
0.9
300
300
CONDITIONS
MIN
TYP
MAX
400
UNITS
kHz
µs
µs
µs
µs
ns
µs
ns
ns
µs
µs
ns
pF
ms
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.
_______________________________________________________________________________________
3
32-Tap, Nonvolatile, I
2
C, Linear, Digital
Potentiometers
MAX5432–MAX5435
TIMING 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
= +5V, T
A
=
+25°C.) (Figures 1 and 2) (Note 1)
Note 2:
The DNL and INL are measured with the potentiometer configured as a variable resistor. For the 3-terminal potentiometers
(MAX5432/MAX5433), H is unconnected and L = GND. At V
DD
= 5V, W is driven with a source current of 80µA for the 50kΩ
configuration, and 40µA for the 100kΩ configuration. At V
DD
= 3V, W 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
(MAX5432/MAX5433 only). The wiper terminal is unloaded and measured with an ideal voltmeter.
Note 4:
Full-scale error is defined as
V
W
- V
H
.
⎛
V
H
⎞
⎜
⎟
⎝
31
⎠
V
W
- V
L
.
⎛
V
H
⎞
⎜
⎟
⎝
31
⎠
Note 5:
Zero-scale error is defined as
Note 6:
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 7:
The device draws current in excess of the specified supply current when the digital inputs are driven with voltages between
(V
DD
- 0.5V) and (GND + 0.5V). See the Supply Current vs. Digital Input Voltage graph in the
Typical Operating Characteristics.
Note 8:
Wiper is at midscale with a 10pF capacitive load. Potentiometer set to midscale, L = GND, an AC source is applied to H,
and the output is measured as 3dB lower than the DC W/H value in dB.
Note 9:
This is measured from the STOP pulse to the time it takes the output to reach 50% of the output step size (divider mode). It
is measured with a maximum external capacitive load of 10pF.
Note 10:
The programming current exists only during NV writes (12ms typ).
Note 11:
Digital timing is guaranteed by design and characterization, and is not production tested.
Note 12:
An appropriate bus pullup resistance must be selected depending on board capacitance. Refer to the I
2
C-bus specifica-
tion document linked to this web address: www.semiconductors.philips.com/acrobat/literature/9398/39340011.pdf
Note 13:
The idle time begins from the initiation of the stop pulse.
Typical Operating Characteristics
(V
DD
= +5V, T
A
= +25°C, unless otherwise noted.)
STANDBY SUPPLY CURRENT
vs. TEMPERATURE
MAX5432–35 toc01
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
DIGITAL INPUTS = GND OR V
DD
0.8
SUPPLY CURRENT (µA)
MAX5432–35 toc02
SUPPLY CURRENT
vs. DIGITAL INPUT VOLTAGE
V
DD
= 5V
SUPPLY CURRENT (µA)
100
MAX5432–35 toc03
1.5
DIGITAL INPUTS = GND OR V
DD
1.2
SUPPLY CURRENT (µA)
1.0
1000
0.9
V
DD
= 5V
V
DD
= 3V
0.6
10
V
DD
= 3V
1
0.1
0.6
0.4
0.3
0.2
0
-40
-15
10
35
60
85
TEMPERATURE (°C)
0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
0
1
2
3
4
5
DIGITAL INPUT VOLTAGE (V)
4
_______________________________________________________________________________________
32-Tap, Nonvolatile, I
2
C, Linear, Digital
Potentiometers
Typical Operating Characteristics (continued)
(V
DD
= +5V, T
A
= +25°C, unless otherwise noted.)
END-TO-END RESISTANCE % CHANGE
vs. TEMPERATURE
MAX5432–35 toc04
MAX5432–MAX5435
END-TO-END RESISTANCE % CHANGE
vs. TEMPERATURE
100kΩ
END-TO-END RESISTANCE % CHANGE
MAX5432-35 toc05
TAP-TO-TAP SWITCHING TRANSIENT
(0 TO MIDSCALE, C
L
= 10pF)
1.0
END-TO-END RESISTANCE CHANGE ( %)
50kΩ
MAX5432–35 toc06
1.0
0.5
0.5
SDA
2V/div
0
0
V
W
1V/div
-0.5
50kΩ
-0.5
-1.0
-40
-15
10
35
60
85
TEMPERATURE (°C)
-1.0
-40
-15
10
35
60
85
1µs/div
TEMPERATURE (°C)
TAP-TO-TAP SWITCHING TRANSIENT
(0 TO MIDSCALE, C
L
= 10pF)
MAX5432–35 toc07
WIPER TRANSIENT AT POWER-ON
MAX5432–35 toc08
MIDSCALE WIPER TRANSIENT
AT POWER-ON
MAX5432–35 toc09
SDA
2V/div
V
DD
2V/div
V
DD
2V/div
V
W
1V/div
V
W
1V/div
V
W
1V/div
100kΩ
1µs/div
10µs/div
50kΩ
10µs/div
100kΩ
MIDSCALE WIPER RESPONSE
vs. FREQUENCY
(MAX5432)
MAX5432 toc10
MIDSCALE WIPER RESPONSE
vs. FREQUENCY (MAX5433)
MAX5432–35 toc11
WIPER RESISTANCE vs. TAP POSITION
(MAX5432)
V
DD
= 3V
600
RESISTANCE (Ω)
500
400
300
200
MAX5432–35 toc12
0
-3
-6
GAIN (dB)
0
-3
-6
GAIN (dB)
-9
C
W
= 33pF
-12
-15
-18
C
W
= 10pF
700
C
W
= 10pF
-9
-12
-15
-18
0.1
1
C
W
= 33pF
100
0
0.1
1
10
FREQUENCY (kHz)
100
1000
0
4
8
12
16
20
24
28
31
TAP POSITION
10
FREQUENCY (kHz)
100
1000
_______________________________________________________________________________________
5
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