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19-3665; Rev 1; 7/09
KIT ATION EVALU BLE AVAILA
One-Time Programmable, Linear-Taper Digital Potentiometers
General Description
The MAX5527/MAX5528/MAX5529 linear-taper digital potentiometers perform the same function as mechanical potentiometers, replacing the mechanics with a simple 2-wire up/down digital interface. These digital potentiometers provide an optional one-time programmable feature that sets the power-on reset position of the wiper. Once the wiper position is programmed, the 2-wire interface can be disabled to prevent unwanted adjustment. The MAX5527/MAX5528/MAX5529 provide an end-to-end resistance of 100k, 50k, and 10k, respectively. The devices feature low temperature coefficients of 35ppm/C end-to-end and 5ppm/C ratiometric. All devices offer 64 wiper positions and operate from a single +2.7V to +5.5V supply. An ultra-low, 0.25A (typ) standby supply current saves power in battery-operated applications. The MAX5527/MAX5528/MAX5529 are available in 3mm x 3mm, 8-pin TDFN and 5mm x 3mm, 8-pin MAX(R) packages. Each device is guaranteed over the -40C to +105C temperature range.
Features
Wiper Position Stored After One-Time Fuse Programming 64 Tap Positions Wiper Position Programmed Through Simple 2-Wire Up/Down Interface 35ppm/C End-to-End Temperature Coefficient 5ppm/C Ratiometric Temperature Coefficient Ultra-Low 1.5A (max) Static Supply Current +2.7V to +5.5V Single-Supply Operation 10k, 50k, and 100k End-to-End Resistances Tiny, 3mm x 3mm, 8-Pin TDFN and 5mm x 3mm, 8-Pin MAX Packages
MAX5527/MAX5528/MAX5529
Ordering Information
PART PIN-PACKAGE RESISTANCE (k) 100 100 50 50 10 10 TOP MARK AOG -- AOH -- AOI --
Applications
Products Using One-Time Factory Calibration Mechanical Potentiometer Replacements
MAX5527GTA+ 8 TDFN-EP* MAX5527GUA+ 8 MAX MAX5528GTA+ 8 TDFN-EP* MAX5528GUA+ 8 MAX MAX5529GTA+ 8 TDFN-EP* MAX5529GUA+ 8 MAX
Pin Configurations
TOP VIEW W1 8H
+Denotes a lead(Pb)-free/RoHs-compliant package. *EP = Exposed pad.
CS 2
7L
Note: All devices are specified over the -40C to +85C operating temperature range.
VDD 3
MAX5527 MAX5528 MAX5529
6 U/D
Functional Diagram
H S63
GND 4 MAX U/D H L
5 PV
VDD GND
8
7
6
5
MAX5527 MAX5528 MAX5529
PV
R62 S62 R61
CS
MAX5527 MAX5528 MAX5529
U/D
UP/DOWN COUNTER
S61 RW 64POSITION DECODER R1 S1 R0 S0 L W S2
PV
ONE-TIME PROGRAM BLOCK
1 W
2 CS
3 VDD
4 GND
TDFN* *EXPOSED PADDLE. CONNECT TO GND.
MAX is a registered trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
One-Time Programmable, Linear-Taper Digital Potentiometers MAX5527/MAX5528/MAX5529
ABSOLUTE MAXIMUM RATINGS
VDD to GND ...........................................................-0.3V to +6.0V PV to GND ...........................................................-0.3V to +12.0V All Other Pins to GND.................................-0.3V to (VDD + 0.3V) Maximum Continuous Current into H, L, and W MAX5527 ......................................................................0.5mA MAX5528 ......................................................................1.0mA MAX5529 ......................................................................2.0mA Continuous Power Dissipation (TA = +70C) 8-Pin MAX (derate 4.5mW/C above +70C) ..............362mW 8-Pin TDFN (derate 18.2mW/C above +70C) .......1454.5mW Operating Temperature Range .........................-40C to +105C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
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
(VDD = +2.7V to +5.5V, VH = VDD, VL = GND, TA = -40C to +105C, unless otherwise noted. Typical values are at VDD = +5.0V, TA = +25C.) (Note 1)
PARAMETER DC PERFORMANCE Resolution MAX5527 End-to-End Resistance End-to-End Resistance Temperature Coefficent Resistance Ratio Temperature Coefficient Integral Nonlinearity Differential Nonlinearity Full-Scale Error Zero-Scale Error Wiper Resistance (Note 2) DYNAMIC CHARACTERISTICS MAX5527 Wiper -3dB Bandwidth (Note 3) MAX5528 MAX5529 MAX5527 Total Harmonic Distortion f = 10kHz, midscale, 1VRMS RL = 100k MAX5528 MAX5529 100 200 1000 -78 -82 -94 dB kHz RW INL DNL MAX5528 MAX5529 TCR MAX5527/MAX5528 MAX5529 Potentiometer configuration, no load, Figure 1 Potentiometer configuration, no load, Figure 1 Potentiometer configuration, no load, Figure 1 Potentiometer configuration, no load, Figure 1 VDD 3V VDD < 3V 64 75 37.5 7.5 100 50 10 35 5 10 0.025 0.01 -0.005 +0.006 90 125 1 1 -1 +1 200 650 125 62.5 12.5 ppm/C ppm/C LSB LSB LSB LSB k Taps SYMBOL CONDITIONS MIN TYP MAX UNITS
2
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One-Time Programmable, Linear-Taper Digital Potentiometers
ELECTRICAL CHARACTERISTICS (continued)
(VDD = +2.7V to +5.5V, VH = VDD, VL = GND, TA = -40C to +105C, unless otherwise noted. Typical values are at VDD = +5.0V, TA = +25C.) (Note 1)
PARAMETER DIGITAL INPUTS (CS, U/D) Input High Voltage Input Low Voltage Input Current Input Capacitance TIMING CHARACTERISTICS (Note 4) U/D Mode to CS Setup Time U/D Mode to CS Hold Time CS to U/D Step Hold Time U/D Step Low Time U/D Step High Time Wiper Settling Time PV Rising Edge to CS Falling Edge CS Falling Edge to PV Falling Edge CS Step Low Time CS Step High Time PV Falling Edge to CS Rising Edge U/D Frequency Power-Up Time POWER SUPPLY Supply Voltage Static Supply Current Programming Voltage Programming Current VDD IDD PV IPV CS = U/D = GND or VDD TA < +50C TA +50C VPV = 11V 10.45 11.00 4 2.7 5.5 1.5 11.55 11.55 5 V A V mA tCU tCI tIC tIL tIH tIW tPC tCP tCL tCH tPH fU/DMAX tUP (Note 6) Figures 2 and 3 Figures 2 and 3 Figures 2 and 3 Figures 2 and 3 Figures 2 and 3 CL = 0pF, Figures 2 and 3 (Note 5) Figure 5 Figure 5 Figure 5 Figure 5 Figure 5 1 5 5 5 1 5 1 50 50 0 100 100 400 ns ns ns ns ns ns ms ms ms ms ms MHz ms VIH VIL IIN CIN 0.1 5 0.7 x VDD 0.3 x VDD 1 V V A pF SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX5527/MAX5528/MAX5529
Note 1: All devices are production tested at TA = +25C, and are guaranteed by design for TA = -40C to +105C. Note 2: The wiper resistance is measured by driving the wiper terminal with a source of 20A for the MAX5527, 40A for the MAX5528, and 200A for the MAX5529. Note 3: Wiper at midscale with a 10pF load. Note 4: Digital timing is guaranteed by design, not production tested. Note 5: Wiper setting time is measured for a single step from U/D transition until wiper voltage reaches 90% of final value. Note 6: Power-up time is the period of time from when the power supply is applied, until the serial interface is ready for writing.
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One-Time Programmable, Linear-Taper Digital Potentiometers MAX5527/MAX5528/MAX5529
Typical Operating Characteristics
(VDD = +5.0V, TA = +25C, unless otherwise noted.)
MAX5527 R-DNL ERROR vs. WIPER POSITION
MAX5527 toc01
MAX5527 R-INL ERROR vs. WIPER POSITION
MAX5527 toc02
MAX5528 R-DNL ERROR vs. WIPER POSITION
MAX5527 toc03
0.010
0.010
0.010
0.005 R-DNL ERROR (LSB) R-INL ERROR (LSB)
0.005 R-DNL ERROR (LSB)
0.005
0
0
0
-0.005
-0.005
-0.005
-0.010 0 16 32 WIPER POSITION 48 64
-0.010 0 16 32 WIPER POSITION 48 64
-0.010 0 16 32 WIPER POSITION 48 64
MAX5528 R-INL ERROR vs. WIPER POSITION
MAX5527 toc04
MAX5529 R-DNL ERROR vs. WIPER POSITION
MAX5527 toc05
MAX5529 R-INL ERROR vs. WIPER POSITION
MAX5527 toc06
0.010
0.010
0.010
0.005 R-DNL ERROR (LSB) R-INL ERROR (LSB)
0.005 R-INL ERROR (LSB)
0.005
0
0
0
-0.005
-0.005
-0.005
-0.010 0 16 32 WIPER POSITION 48 64
-0.010 0 16 32 WIPER POSITION 48 64
-0.010 0 16 32 WIPER POSITION 48 64
WIPER RESISTANCE vs. WIPER VOLTAGE
END-TO-END RESISTANCE CHANGE (%) VDD = 3V 125 WIPER RESISTANCE () 100 VDD = 5V 75 50 25 0 0 MAX5527: VDD = 5V, ISOURCE = 50A VDD = 3V, ISOURCE = 30A MAX5528: VDD = 5V, ISOURCE = 100A VDD = 3V, ISOURCE = 60A MAX5529: VDD = 5V, ISOURCE = 500A VDD = 3V, ISOURCE = 300A 1 2 3 4 5
MAX5527 toc07
END-TO-END RESISTANCE PERCENTAGE CHANGE vs. TEMPERATURE
MAX5527 toc08
W-TO-L RESISTANCE vs. WIPER POSITION
90 W-TO-L RESISTANCE (k) 80 70 60 50 40 30 20 MAX5529 MAX5528 MAX5527
MAX5527 toc09
150
0.4 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 -40 -15 10 35 60 85
100
10 0 110 0 16 32 WIPER POSITION 48 64 TEMPERATURE (C)
WIPER VOLTAGE
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One-Time Programmable, Linear-Taper Digital Potentiometers
Typical Operating Characteristics (continued)
(VDD = +5V, TA = +25C, unless otherwise noted.)
STATIC SUPPLY CURRENT vs. TEMPERATURE
MAX5527 toc10
MAX5527/MAX5528/MAX5529
CS = U/D = GND 250 SUPPLY CURRENT (nA) VDD = 5V 200 150 100 50 0 -40 -15 10 35 60 85
CS = U/D = GND 250 SUPPLY CURRENT (nA) 200 150 100 50
MAX5527 toc11
300
300
100 SUPPLY CURRENT (A)
VDD = 5V
10 VDD = 3V 1
VDD = 3V
0.1
0.01 0 110 2.5 3.0 3.5 4.0 4.5 5.0 5.5 TEMPERATURE (C) SUPPLY VOLTAGE (V) 0 1 2 3 4 5 6 DIGTAL INPUT VOLTAGE (V)
MIDSCALE WIPER RESPONSE vs. FREQUENCY
MAX5527 toc13
TOTAL HARMONIC DISTORTION vs. FREQUENCY
MIDSCALE, 1VRMS, RL = 100k
MAX5527 toc14
0 -3 MAX5529 -6 GAIN (dB)
-40 -50 -60 THD (dB) -70 -80 -90 MAX5527 MAX5528
-9 MAX5528 -12 -15 -18 0.1 1 10 100 1000 10,000 FREQUENCY (kHz) MAX5527
-100 MAX5529 -110 0.01 0.1 1 FREQUENCY (kHz) 10 100
TAP-TO-TAP SWITCHING TRANSIENT
MAX5527 toc15
U/D 2V/div GND
OUTPUT W 50mV/div
400ns
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MAX5527 toc12
STATIC SUPPLY CURRENT vs. SUPPLY VOLTAGE
SUPPLY CURRENT vs. DIGITAL INPUT VOLTAGE
1000
One-Time Programmable, Linear-Taper Digital Potentiometers MAX5527/MAX5528/MAX5529
Typical Operating Characteristics (continued)
(VDD = +5V, TA = +25C, unless otherwise noted.)
TAP-TO-TAP SWITCHING TRANSIENT
MAX5527 toc16
MAX5527 POWER-UP WIPER TRANSIENT
MAX5527 toc17
U/D 2V/div GND VDD 2V/div GND OUTPUT W 50mV/div OUTPUT W 2V/div GND
400ns
2s
MAX5528 POWER-UP WIPER TRANSIENT
MAX5527 toc18
MAX5529 POWER-UP WIPER TRANSIENT
MAX5527 toc19
VDD 2V/div GND OUTPUT W 2V/div GND
OUTPUT W 2V/div GND
VDD 2V/div GND
1s
2s
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One-Time Programmable, Linear-Taper Digital Potentiometers
Pin Description
PIN 1 2 3 4 5 NAME W CS VDD GND PV Wiper Connection Chip-Select Input. A high-to-low CS transition determines the increment/decrement mode. Increment if U/D is high, or decrement if U/D is low. CS is also used for one-time programming. See the PV OneTime Programming section. Supply Voltage. Bypass with a 0.1F capacitor to GND. Ground One-Time Programming Voltage. Connect PV to an 11V supply at the time the device is programmed/locked, and bypass with a 22F capacitor to GND. For normal operation, connect to GND or leave floating. Up/Down Control Input. When CS is low, a low-to-high transition at U/D increments or decrements the wiper position. See the Digital Interface Operation section. Resistor Low Terminal Resistor High Terminal Exposed Pad (TDFN Only). Internally connected to GND. Connect to a large ground plane to maximize thermal dissipation. DESCRIPTION
MAX5527/MAX5528/MAX5529
6 7 8 --
U/D L H EP
Detailed Description
The MAX5527/MAX5528/MAX5529 100k/50k/10k end-to-end resistance digitally-controlled potentiometers offer 64 wiper tap positions accessible along the resistor array between H and L. These devices function as potentiometers or variable resistors (see Figure 1). The wiper (W) position is adjusted sequentially through the tap positions using a simple 2-wire up/down interface. These digital potentiometers provide an optional one-time programmable feature that sets and locks the power-on reset position of the wiper (see the PV OneTime Programming section). Once the desired wiper position is programmed, the 2-wire interface can be disabled to prevent unwanted adjustment.
POTENTIOMETER CONFIGURATION H VARIABLE-RESISTOR CONFIGURATION H
W
W
L
L
Figure 1. Potentiometer/Variable-Resistor Configuration
Digital Interface Operation
The MAX5527/MAX5528/MAX5529 provide two modes of operation when the serial interface is active: increment mode or decrement mode. The serial interface is only active when CS is low. The CS and U/D inputs control the position of the wiper along the resistor array. Set U/D high to increment the MAX5527/MAX5528/MAX5529 when CS transitions from high to low (Figure 2). Set U/D low to decrement the MAX5527/MAX5528/MAX5529 when CS transitions high to low (Figure 3). Once CS is held low, each lowto-high transition at U/D increments or decrements the wiper one position. Once the increment or decrement
mode is set, the device remains in that mode until CS goes high. Idle U/D high for normal operation. If U/D is low when CS transitions low to high, the wiper moves one additional tap in its present direction. The wiper remains in the same position when U/D is high and CS transitions low to high. After CS returns high, the wiper position remains the same (Figure 4). Additional increments do not change the wiper position when the wiper is at the maximum end of the resistor array. Additional decrements do not change the wiper position when the wiper is at the minimum end of the resistor array.
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One-Time Programmable, Linear-Taper Digital Potentiometers MAX5527/MAX5528/MAX5529
VDD tUP CS tCU U/D tIW VW tCI tIL tIH tIC
Figure 2. Increment-Mode Timing Diagram
VDD tUP CS tCU U/D tIW VW tCI tIH tIL tIC
Figure 3. Decrement-Mode Timing Diagram
CS
U/D
VW
WIPER REMAINS THE SAME WITH U/D HIGH AND CS RISING
WIPER CHANGES WITH U/D LOW AND CS RISING
Figure 4. CS Low-to-High Transition Timing Diagram
PV One-Time Programming
The MAX5527/MAX5528/MAX5529 power up and function after power-up with the wiper position set in one of three ways: 1) Factory default power-up position, midscale, adjustable wiper 2) A newly programmed power-up position, adjustable wiper
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3) A new programmed power-up position, locked wiper The wiper is set to the factory default position at powerup (midscale, tap 31). Connect PV to GND or leave floating to continue powering up the wiper position at midscale. See Table 1 for the default and one-time programming options.
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One-Time Programmable, Linear-Taper Digital Potentiometers MAX5527/MAX5528/MAX5529
U/D +11V PV 0V CS tPC 6 PULSES RECORD WIPER POSITION OPTIONAL 7TH LOCKOUT BIT
tCH
tCL
tCP
tPH
Figure 5. One-Time Program Mode, Serial-Interface Timing Diagram
Table 1. One-Time Programming Options
MODE Factory Default (Unprogrammed) Programmed by Six CS Pulses Programmed by Seven CS Pulses POWER-ON RESET WIPER POSITION Tap 31 Programmed position Programmed position ADJUSTABLE WIPER Yes Yes No
TRACE PARASITICS 11V 22F LPARASITIC < 250H RPARASITIC < 40 PV
MAX5527 MAX5528 MAX5529
Figure 6. PV Power-Supply Decoupling
Change the wiper's power-up position using the PV one-time programming sequence after power-up (see Figure 5). After setting the wiper to the desired powerup position, perform the following six-step sequence: 1) 2) 3) 4a) Set U/D and CS high. Connect an external voltage source at PV in the range of +11V to +11.55V. Pull CS low. Pulse CS high for six cycles, consisting of CS starting low and going high for at least tCH, and then low for at least t CL, to change the wiper power-up position. The wiper remains adjustable. Pulse CS high for seven cycles, consisting of CS starting low and going high for at least tCH and then low for at least tCL, to change the wiper power-up position and lock the wiper in that same position. The seventh CS pulse is labeled the optional lockout bit in Figure 5. Connect PV to GND or release the voltage source, leaving PV floating. Pull CS high.
4b)
5) 6)
Pulse CS high for six cycles to change the wiper powerup position. The wiper position returns to this programmed position on power-up, but remains adjustable. Pulse CS high for seven cycles to lock the MAX5527/ MAX5528/MAX5529 to a specific wiper position with no further adjustments allowed. This effectively converts the potentiometer to a fixed resistor-divider. The seventh pulse locks the wiper position and disables the up/down interface. Once locked, connect U/D and CS high, low, or leave them floating without increasing the supply current (see Table 1). If six clock pulses are used, the interface is enabled and the device can be put into program mode again. However, the part uses one-time programmable (OTP) memory and should be programmed only once. If the part is programmed more than once, all applied values are ORed together. Thus, if 010101 is programmed the first time and 101010 is programmed the second time, the result will be 111111. The external PV power supply must source at least 5mA and have a good transient response. Decouple the PV power supply with a 22F capacitor to GND. Ensure that no more than 250H of inductance and/or 40 of parasitic resistance exists between the capacitor and the device (see Figure 6).
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One-Time Programmable, Linear-Taper Digital Potentiometers MAX5527/MAX5528/MAX5529
5V H 30V W 5V
30V
MAX5527 MAX5528 MAX5529
VOUT L
H
VOUT
MAX5527 MAX5528 MAX5529
L
W
Figure 7. Positive LCD Bias Control Using a Voltage-Divider
Figure 8. Positive LCD Bias Control Using a Variable Resistor
+5V
W VIN L H R3 C 5V VOUT
VIN OUT H MAX6160 ADJ W R2 L R1 V0 REF
R1 H
GND
MAX5527 MAX5528 MAX5529
MAX5527 MAX5528 MAX5529
R2
W
L
V0 = 1.23V 100k FOR THE MAX5527 R2(k) V0 = 1.23V 50k FOR THE MAX5528 R2(k) V0 = 1.23V 10k FOR THE MAX5529 R2(k)
Figure 9. Programmable Filter
Figure 10. Adjustable Voltage Reference
Applications Information
Use the MAX5527/MAX5528/MAX5529 in applications requiring digitally controlled adjustable resistance, such as LCD contrast control where voltage biasing adjusts the display contrast, or for programmable filters with adjustable gain and/or cutoff frequency.
Programmable Filter
Figure 9 shows the configuration for a 1st-order programmable filter. The gain of the filter is adjusted by R2, and the cutoff frequency is adjusted by R3. Use the following equations to calculate the gain (G), and the -3dB cutoff frequency (fC), only up to frequencies one decade below the wiper -3dB bandwidth. R1 R2 1 fC = 2 x R 3 x C G =1+
Positive LCD Bias Control
Figures 7 and 8 show an application where the voltagedivider or variable resistor is used to make an adjustable, positive LCD bias voltage. The op-amp provides buffering and gain to the resistor-divider network made by the potentiometer (Figure 7), or to a fixed resistor and a variable resistor (Figure 8).
Adjustable Voltage Reference
Figure 10 shows the MAX5527/MAX5528/MAX5529 used as the feedback resistors in an adjustable-voltage reference application.
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One-Time Programmable, Linear-Taper Digital Potentiometers
Layout and Power-Supply Considerations
Proper layout and power-supply bypassing can affect device performance. Bypass VDD with a 0.1F capacitor as close to the device as possible. When programming the wiper position, bypass PV with a 22F capacitor as close to the device as possible. For a VDD power supply with a slew rate greater than 1V/s or in applications where power-supply overshoot is prevalent, connect a 10 resistor in series to VDD and bypass VDD with an additional 4.7F capacitor to ground.
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE 8 TDFN-EP 8 MAX PACKAGE CODE T833+2 U8+1 DOCUMENT NO. 21-0137 21-0036
MAX5527/MAX5528/MAX5529
Chip Information
TRANSISTOR COUNT: 3420 PROCESS: BiCMOS
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One-Time Programmable, Linear-Taper Digital Potentiometers MAX5527/MAX5528/MAX5529
Revision History
REVISION NUMBER 0 1 REVISION DATE 5/05 7/09 Initial release Added lead-free note to the Ordering Information. Added exposed pad information to the Pin Description. Added text to PV One-Time Programming section. DESCRIPTION PAGES CHANGED -- 1, 7, 9
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.

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