MAX5478EUD ,Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital PotentiometersApplications A1MAX5479A2Mechanical Potentiometer ReplacementLow-Drift Programmable-Gain Amplifiers2 ..
MAX5478EUD ,Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital PotentiometersELECTRICAL CHARACTERISTICS(V = +2.7V to +5.25V, H_ = V , L_ = GND, T = -40°C to +85°C, unless other ..
MAX5478EUD+ ,Dual, 256-Tap, Nonvolatile, I²C-Interface, Digital PotentiometersApplicationsMAX5477A0LBMechanical Potentiometer Replacement MAX5478A1MAX5479A2Low-Drift Programmabl ..
MAX5478EUD+ ,Dual, 256-Tap, Nonvolatile, I²C-Interface, Digital PotentiometersFeaturesThe MAX5477/MAX5478/MAX5479 nonvolatile, dual, ♦ Power-On Recall of Wiper Position fromlin ..
MAX5478EUD+T ,Dual, 256-Tap, Nonvolatile, I²C-Interface, Digital PotentiometersELECTRICAL CHARACTERISTICS(V = +2.7V to +5.25V, H_ = V , L_ = GND, T = -40°C to +85°C, unless other ..
MAX5479EUD+ ,Dual, 256-Tap, Nonvolatile, I²C-Interface, Digital PotentiometersMAX5477/MAX5478/MAX547919-3379; Rev 5; 11/11Dual, 256-Tap, Nonvolatile,2I C-Interface, Digital Pote ..
MAXQ3212 ,Microcontroller with Analog Comparator and LED DriverELECTRICAL CHARACTERISTICS(V = V to V , C = 10µF + 0.1µF, T = -40°C to +85°C. Typical values are at ..
MAXQ3212 ,Microcontroller with Analog Comparator and LED DriverFeaturesNote: Some revisions of this device may incorporate deviationsAnalog Comparator Uses Intern ..
MAXQ610A-2524+ ,16-Bit Microcontroller with Infrared ModuleApplications 0.2µA (typ), 2.0µA (max) in Stop ModeT = +25°C, Power-Fail Monitor DisabledARemote Con ..
MAXQ610A-2524+T ,16-Bit Microcontroller with Infrared ModuleFeatures16-bit RISC microcontroller and integrated peripheralsincluding two USARTs and an SPI™ mast ..
MAXQ610A-2541+T ,16-Bit Microcontroller with Infrared ModuleBlock Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
MAXQ610J-0000+ ,16-Bit Microcontroller with Infrared ModuleFeatures†MAXQ610J-0000+ 0°C to +70°C 44 TQFN-EP♦ High-Performance, Low-Power 16-Bit RISC CoreMAXQ61 ..
MAX5477EUD-MAX5478EUD
Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital Potentiometers
General DescriptionThe MAX5477/MAX5478/MAX5479 nonvolatile, dual,
linear-taper, digital potentiometers perform the function
of a mechanical potentiometer, but replace the
mechanics with a simple 2-wire digital interface. Each
device performs the same function as a discrete poten-
tiometer or variable resistor and has 256 tap points.
The devices feature an internal, nonvolatile EEPROM
used to store the wiper position for initialization during
power-up. A write-protect feature prevents accidental
overwrites of the EEPROM. The fast-mode I2C-compati-
ble serial interface allows communication at data rates
up to 400kbps, minimizing board space and reducing
interconnection complexity in many applications. Three
address inputs allow a total of eight unique address
combinations.
The MAX5477/MAX5478/MAX5479 provide three nomi-
nal resistance values: 10kΩ(MAX5477), 50kΩ
(MAX5478), or 100kΩ(MAX5479). The nominal resistor
temperature coefficient is 35ppm/°C end-to-end and
5ppm/°C ratiometric. The low temperature coefficient
makes the devices ideal for applications requiring a low-
temperature-coefficient variable resistor, such as low-
drift, programmable gain-amplifier circuit configurations.
The MAX5477/MAX5478/MAX5479 are available in 16-
pin 3mm x 3mm x 0.8mm thin QFN and 14-pin 4.4mm x
5mm TSSOP packages. These devices operate over
the extended -40°C to +85°C temperature range.
ApplicationsMechanical Potentiometer Replacement
Low-Drift Programmable-Gain Amplifiers
Volume Control
Liquid-Crystal Display (LCD) Contrast Control
FeaturesPower-On Recall of Wiper Position from
Nonvolatile MemoryEEPROM Write ProtectionTiny 3mm x 3mm x 0.8mm Thin QFN Package35ppm/°C End-to-End Resistance Temperature
Coefficient5ppm/°C Ratiometric Temperature CoefficientFast 400kbps I2C†
-Compatible Serial Interface1µA (max) Static Supply CurrentSingle-Supply Operation: +2.7V to +5.25V256 Tap Positions per Potentiometer±0.5 LSB DNL in Voltage-Divider Mode±1 LSB INL in Voltage-Divider Mode
MAX5477/MAX5478/MAX5479
Dual, 256-Tap, Nonvolatile, I2C-Interface,
Digital Potentiometers
Functional Diagram19-3379; Rev 2; 12/04
Pin Configurations appear at end of data sheet.†Purchase of I2C components from Maxim Integrated
Products, Inc. or one of its sublicensed Associated
Companies, conveys a license under the Philips I2C Patent
Rights to use these components in an I2C system, provided
that the system conforms to the I2C Standard Specification as
defined by Philips.
*Future product—contact factory for availability.
MAX5477/MAX5478/MAX5479
Dual, 256-Tap, Nonvolatile, I2C-Interface,
Digital Potentiometers
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VDD= +2.7V to +5.25V, H_ = VDD, L_ = GND, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VDD= +5V, TA=
+25°C.) (Note 1)
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.
SDA, SCL, VDDto GND.........................................-0.3V to +6.0V
All Other Pins to GND.................................-0.3V to (VDD+ 0.3V)
Maximum Continuous Current into H_, L_, and W_
MAX5477......................................................................±5.0mA
MAX5478......................................................................±1.3mA
MAX5479......................................................................±0.6mA
Continuous Power Dissipation (TA= +70°C)
16-Pin Thin QFN (derate 17.5mW/°C above +70°C) 1399mW
14-Pin TSSOP (derate 9.1mW/°C above +70°C).........727mW
Operating Temperature Range...........................-40°C to +85°C
Maximum Junction Temperature.....................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
MAX5477/MAX5478/MAX5479
Dual, 256-Tap, Nonvolatile, I2C-Interface,
Digital Potentiometers
ELECTRICAL CHARACTERISTICS (continued)(VDD= +2.7V to +5.25V, H_ = VDD, L_ = GND, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VDD= +5V, TA=
TIMING CHARACTERISTICS(VDD= +2.7V to +5.25V, H_ = VDD, L_ = GND, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VDD= +5V,
MAX5477/MAX5478/MAX5479
Dual, 256-Tap, Nonvolatile, I2C-Interface,
Digital Potentiometers
Note 1:All devices are production tested at TA= +25°C and are guaranteed by design and characterization for -40°C < TA< +85°C.
Note 2:The DNL and INL are measured with the potentiometer configured as a voltage-divider with H_ = VDDand L_ = GND. The
wiper terminal is unloaded and measured with a high-input-impedance voltmeter.
Note 3:The DNL and INL are measured with the potentiometer configured as a variable resistor. H_ is unconnected and L_ =
GND. For VDD= +5V, the wiper is driven with 400µA (MAX5477), 80µA(MAX5478), or 40µA (MAX5479). For VDD= +3V,
the wiper is driven with 200µA (MAX5477), 40µA (MAX5478), or 20µA (MAX5479).
Note 4:The wiper resistance is measured using the source currents given in Note 3.
Note 5:The devices draw current in excess of the specified supply current when the digital inputs are driven with voltages between
(VDD - 0.5V) and (GND + 0.5V). See Supply Current vs. Digital Input Voltage in the Typical Operating Characteristics.
Note 6:Wiper at midscale with a 10pF load (DC measurement). L_ = GND, an AC source is applied to H_, and the W_ output is
measured. A 3dB bandwidth occurs when the AC W_/H_ value is 3dB lower than the DC W_/H_ value.
Note 7:The programming current exists only during power-up and EEPROM writes.
Note 8:The SCL clock period includes rise and fall times (tR= tF). All digital input signals are specified with tR= tF= 2ns and
timed from a voltage level of (VIL+ VIH) / 2.
Note 9:Digital timing is guaranteed by design and characterization, and is not production tested.
Note 10: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 11:An appropriate bus pullup resistance must be selected depending on board capacitance. Refer to the I2C-bus specifica-
tion document linked to this web address: www.semiconductors.philips.com/acrobat/literature/9398/39340011.pdf
Note 12:The idle time begins from the initiation of the STOP pulse.
TIMING CHARACTERISTICS (continued)(VDD= +2.7V to +5.25V, H_ = VDD, L_ = GND, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VDD= +5V,
MAX5477/MAX5478/MAX5479
Dual, 256-Tap, Nonvolatile, I2C-Interface,
Digital Potentiometers
Typical Operating Characteristics(VDD= +5V, H_ = VDD, L_ = GND, TA= +25°C, unless otherwise noted.)
MAX5477/MAX5478/MAX5479
Dual, 256-Tap, Nonvolatile, I2C-Interface,
Digital Potentiometersypical Operating Characteristics (continued)(VDD= +5V, H_ = VDD, L_ = GND, TA= +25°C, unless otherwise noted.)
MAX5477/MAX5478/MAX5479
Dual, 256-Tap, Nonvolatile, I2C-Interface,
Digital Potentiometersypical Operating Characteristics (continued)(VDD= +5V, H_ = VDD, L_ = GND, TA= +25°C, unless otherwise noted.)
MAX5477/MAX5478/MAX5479
Dual, 256-Tap, Nonvolatile, I2C-Interface,
Digital Potentiometers
Detailed DescriptionThe MAX5477/MAX5478/MAX5479 contain two resistor
arrays with 255 elements in each array. The MAX5477
has a total end-to-end resistance of 10kΩ, the
MAX5478 has an end-to-end resistance of 50kΩ, and
the MAX5479 has an end-to-end resistance of 100kΩ.
The MAX5477/MAX5478/MAX5479 provide access to
the high, low, and wiper terminals for a standard volt-
age-divider configuration. Connect H_, L_, and W_ in
any desired configuration as long as their voltages
remain between GND and VDD.
