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19-2812; Rev 0; 2/08
KIT ATION EVALU ABLE AVAIL
4-Level or 2-Level Logic to High-Voltage Level Shifter for TFT LCD TV Display
General Description
The MAX17079 is a 7-channel logic-level input to highvoltage output level shifter. Each channel has two inputs plus a shared enable input. Each channel has two outputs, which can be set to five output levels. Two outputs are complementary to each other. The five output levels are set by five supply rails that are common to all 14 outputs. The five supply rails include a typical TFT VCOM rail. Two upper rails are always greater than VCOM, with VH1 always greater than VH2. The two lower rails are always less than VCOM, with VL1 always less than VL2. Other supply rails are VLS (the typical TFT AVDD supply) and VCC (the logic supply). The MAX17079 can also be configured as a two-level voltage shifter. When EN is low, all 14 outputs connect to VCOM, and when EN is high, the outputs are determined by their inputs. The logic inputs are driven by the timing controller. The output switches are typically 3 with low propagation delays and fast rise times. The MAX17079 has a minimum dead time to prevent shoot-through currents between supplies. The MAX17079 has thermal shutdown to protect against overheating, VCC undervoltage lockout (UVLO), and VLS UVLO. The MAX17079 is in a 40-pin, 6mm x 6mm, thin QFN package, with exposed pad and a maximum height of 0.8mm.
Features
o 7-Channel Logic-Level Input to High-Voltage Output Level Shifter o Complementary Outputs in Each Channel o VLS Input Range from 10V to 18V o VCC Input Range from 2.3V to 3.6V o 2-Level or 4-Level Operation o Sequential or Combinational Logic o 3 Output Switches o 5-Level Output o Short Propagation Delay (80ns typ) o Fast Rise Time (30ns typ) o Built-In Dead Time to Prevent Shoot-Through o Thermal Shutdown o VLS and VCC Undervoltage Lockout
MAX17079
Ordering Information
PART TEMP RANGE PINPACKAGE PKG CODE
MAX17079GTL+ -40C to +105C
40 TQFN-EP* T4066+5 (6mm x 6mm)
*EP = Exposed paddle.
Simplified Operating Circuit
3.3V 10V 7V 6V 5V 2V 15V
Applications
TFT LCD TV Panels
VCC VH1 VH2 VCOM VL2 VL1 VLS OA1
Pin Configuration
A1
OB1 OA2 OB2
OA2
OB2
OA3
OB3
OA4
OB4
OA5
OB5
OA6
TOP VIEW
OB6
B1 A2
30 29 28 27 26 25 24 23 22 21 OB1 31 OA1 32 ST 33 VH1 34 VH2 35 VLS 36 AGND 37 VCC 38 EN 39 CH 40 1 A1 2 B1 3 A2 4 B2 5 A3 6 B3 7 A4 8 B4 9 A5 10 B5 EP 20 OA7 19 OB7 18 VCOM 17 VL1 16 VL2
SYSTEM
B2 A3 B3 A4
OA3
OB3
OA4 OB4
PANEL
MAX17079
B4 A5
MAX17079
15 DGND 14 B7 13 A7 12 B6 11 A6
B5 A6 B6
OA5 OB5
OA6 OB6
A7 B7 OA7
OB7
EP = EXPOSED PAD
THIN QFN (6mm x 6mm)
AGND
EN
DGND CH
ST
________________________________________________________________ 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.
4-Level or 2-Level Logic to High-Voltage Level Shifter for TFT LCD TV Display MAX17079
ABSOLUTE MAXIMUM RATINGS
VCC to AGND...........................................................-0.3V to +7V Ax, Bx, CH, ST, EN to AGND....................................-0.3V to +7V DGND to AGND.....................................................-0.3V to +0.3V VLS to DGND..........................................................-0.3V to +20V VH1, VH2, VL1, VL2, VCOM to DGND ........-0.3V to (VLS + 0.3V) OAx, OBx to DGND ..........................(VL1 - 0.3V) to (VH1 + 0.3V) OBx, OAx RMS Current.......................................................50mA VH1, VH2, VL1, VL2 RMS Current.....................................300mA VH1, VL2, VCOM, to DGND.............(VL1 - 0.3V) to (VH1 + 0.3V) Continuous Power Dissipation (TA = +70C) 40-Pin, 6mm x 6mm TQFN (derate 35.7mW/C above +70C) .........................2857.1mW 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
(Circuit of Figure 1, VVCC = 3.3V, VVLS = 15V, VVH1 = 10V, VVH2 = 7V, VVCOM = 6V, VVL2 = 5V, VVL1 = 2V, TA = -40C to +105C. Typical values are at TA = +25C, unless otherwise noted.) (Note 1)
PARAMETER GENERAL VCC Input Voltage Range VCC Input Undervoltage Lockout Rising edge, 200mV typical hysteresis VLS Input Voltage Range VLS Input Undervoltage Lockout VH1 Input Voltage Range VH2 Input Voltage Range VL2 Input Voltage Range VL1 Input Voltage Range VCOM Input Voltage Range VCC Quiescent Current VLS Quiescent Current VH1 Quiescent Current VH2 Quiescent Current VL1 Quiescent Current VL2 Quiescent Current INPUTS AND OUTPUTS Logic-Input Low Voltage Logic-Input High Voltage Logic-Low Input Current Logic-High Input Current VH1 - OAx, VH1 - OBx On-Resistance VH2 - OAx, VH2 - OBx On-Resistance EN, CH, ST, Ax, Bx EN, CH, ST, Ax, Bx EN, CH, ST, Ax, Bx to AGND VCC to EN, CH, ST, Ax, Bx VVLS = 10V, VVH1 = 5V, I(OAx, OBx) = 20mA VVLS = 10V, VVH2 = 5V, I(OAx, OBx) = 20mA 0.7 x VVCC -1 10.0 16.5 3 3 +1 30.0 0.3 x VVCC V V A A All channels in STATE 2 All channels in STATE 1 or STATE 3 All channels in STATE 2 or STATE 4 All channels in STATE 1 or STATE 3 All channels in STATE 2 or STATE 4 Rising edge, 500mV typical hysteresis 2.3 1.8 10 8.0 4 0 0 0 4 50 300 150 -125 -90 -130 8.5 2.0 3.6 2.2 18 9.0 VVLS VVLS - 4 VVLS - 4 VVLS - 4 VVLS - 4 V V V V V V V V V A A A A A A CONDITIONS MIN TYP MAX UNITS
2
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4-Level or 2-Level Logic to High-Voltage Level Shifter for TFT LCD TV Display
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, VVCC = 3.3V, VVLS = 15V, VVH1 = 10V, VVH2 = 7V, VVCOM = 6V, VVL2 = 5V, VVL1 = 2V, TA = -40C to +105C. Typical values are at TA = +25C, unless otherwise noted.) (Note 1)
PARAMETER VL1 - OAx, VL1 - OBx On-Resistance VL2 - OAx, VL2 - OBx On-Resistance CONDITIONS VVLS = 10V, VVL1 = 5V, I(OAx, OBx) = 20mA VVLS = 10V, VVL2 = 5V, I(OAx, OBx) = 20mA VVLS = 10V, VVH2 = 6V, VVL2 = 4V, I(OAx, OBx) = 20mA (VH2 to OAx) - (VL2 to OAx), (VH2 to OBx) - (VL2 to OBx) On-Resistance Difference VVLS = 10V, VVH1 = 6V, VVL1 = 4V, I(OAx, OBx) = 20mA (VH1 to OAx) - (VL1 to OAx), (VH1 to OBx) - (VL1 to OBx) VCOM - OAx, VCOM - OBx On-Resistance TIMING Input Pulse Width EN Setup Time EN Falling Delay Output Delay Time Output Rise Time Output Fall Time Input Pulse Width tHH, tHL, tLH, tLL, refers to the minimum duration of input for a given state t ES t ER tD, no load, input to 10% output tR, no load, rails of 0V and 18V, measured from 2V to 16V tF, no load, rails of 0V and 18V, measured from 16V to 2V t PW, no load, refers to the minimum high or low time of Ax or Bx 500 500 -50 70 80 30 30 +100 200 200 100 100 ns ns ns ns ns ns ns VVLS = 10V, VVCOM = 5V, I(OAx, OBx) = 20mA -1.5 0 15 +1.5 -0.5 MIN TYP 3 3 0 +0.5 MAX UNITS
MAX17079
Note 1: TA = -40C specifications are guaranteed by design, not production tested. Production test is done at TA = +25C and TA = +85C.
Timing Diagram
tES Ax tPW Ax Bx tD tD Bx OAx tF OBx OAx tR tER tHH tHL EN tLH tLL
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3
4-Level or 2-Level Logic to High-Voltage Level Shifter for TFT LCD TV Display MAX17079
Typical Operating Characteristics
(Circuit of Figure 1. VIN = 12V, TA = +25C, unless otherwise noted.)
ENABLE PROPAGATION DELAY
MAX17079 toc01
PROPAGATION DELAY (STATE 1 - STATE 2)
MAX17079 toc02
PROPAGATION DELAY (STATE 2 - STATE 3)
MAX17079 toc03
OB2 EN OB2 OA2 OA2
OA2
OB2 B2
B2
A2 A2 40ns/div EN: 2V/div OA2: 5V/div OB2: 5V/div OB2: 5V/div OA2: 5V/div 20ns/div B2: 5V/div A2: 5V/div OB2: 5V/div OA2: 5V/div 20ns/div B2: 5V/div A2: 5V/div
PROPAGATION DELAY (STATE 3 - STATE 4)
MAX17079 toc04
PROPAGATION DELAY (STATE 4 - STATE 1)
MAX17079 toc05
VCOM SWITCH OUTPUT RESISTANCE
STATE 0 VVCOM = 6V 0.8 VVCOM - VOA2 (V)
MAX17079 toc06
1.0
OB2
OB2
OA2
OA2
0.6
B2
0.4
B2 A2
0.2
A2 0 20ns/div OB2: 5V/div OA2: 5V/div B2: 5V/div A2: 5V/div OB2: 5V/div OA2: 5V/div 20ns/div B2: 5V/div A2: 5V/div 0 10 20 30 40 50 60 70 IOA2 (mA)
VH2 SWITCH OUTPUT RESISTANCE
MAX17079 toc07
VH1 SWITCH OUTPUT RESISTANCE
MAX17079 toc08
VL1 SWITCH OUTPUT RESISTANCE
STATE 3 VVL1 = 2V 120 VOA2 - VVL1 (mV)
MAX17079 toc09
150 STATE 2 VVH2 = 7V 120 VVH2 - VOA2 (mV)
150 STATE 1 VVH1 = 10V 120 VVH1 - VOA2 (mV)
150
90
90
90
60
60
60
30
30 0 0 10 20 30 40 50 0 10 20 30 40 50 IOA2 (mA) IOA2 (mA)
30 0 0 10 20 30 40 50 IOA2 (mA)
0
4
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4-Level or 2-Level Logic to High-Voltage Level Shifter for TFT LCD TV Display MAX17079
Typical Operating Characteristics (continued)
(Circuit of Figure 1. VIN = 12V, TA = +25C, unless otherwise noted.)
VL2 SWITCH OUTPUT RESISTANCE
STATE 4 VVL2 = 5V 120 VOA2 - VVL2 (mV)
MAX17079 toc10
4-LEVEL SEQUENTIAL STARTUP
MAX17079 toc11
4-LEVEL COMBINATIONAL STARTUP
MAX17079 toc12
150
OA2
OA2
90 EN 60 A2 A2 30 B2 B2 0 0 10 20 30 40 50 OA2: 5V/div A2: 5V/div 40s/div B2: 5V/div EN: 2V/div OA2: 5V/div A2: 5V/div 40s/div B2: 5V/div EN: 2V/div IOA2 (mA) EN
4-LEVEL SEQUENTIAL OPERATION
MAX17079 toc13
2-LEVEL SEQUENTIAL STARTUP
MAX17079 toc14
2-LEVEL COMBINATIONAL STARTUP
MAX17079 toc15
OB2 EN OA2 OA2 OB2 OB2 EN OA2
B2 A2 A2 40s/div OB2: 5V/div OA2: 5V/div B2: 5V/div A2: 5V/div OA2: 5V/div OB2: 5V/div 40s/div A2: 5V/div EN: 5V/div OA2: 5V/div OB2: 5V/div 40s/div A2: 5V/div EN: 5V/div A2
VCC QUIESCENT CURRENT vs. TEMPERATURE
MAX17079 toc16
VLS QUIESCENT CURRENT vs. TEMPERATURE
MAX17079 toc17
50 STATE 1 48
0.40 0.35 0.30 STATE 2
IVCC (A)
IVLS (mA)
46
0.25 0.20 STATE 1
44
42
0.15 0.10 -40 -15 10 35 60 85 -40 -15 10 35 60 85 TEMPERATURE (C) TEMPERATURE (C)
40
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5
4-Level or 2-Level Logic to High-Voltage Level Shifter for TFT LCD TV Display MAX17079
Pin Description
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 NAME A1 B1 A2 B2 A3 B3 A4 B4 A5 B5 A6 B6 A7 B7 DGND VL2 VL1 VCOM OB7 OA7 OB6 OA6 OB5 OA5 OB4 OA4 OB3 OA3 OB2 OA2 OB1 OA1 ST VH1 VH2 VLS AGND VCC Level Shifter Logic Input Level Shifter Logic Input Level Shifter Logic Input Level Shifter Logic Input Level Shifter Logic Input Level Shifter Logic Input Level Shifter Logic Input Level Shifter Logic Input Level Shifter Logic Input Level Shifter Logic Input Level Shifter Logic Input Level Shifter Logic Input Level Shifter Logic Input Level Shifter Logic Input Output Supply Ground Connection Output Supply Rail. Bypass VL2 to DGND with a 0.1F capacitor. Output Supply Rail. Bypass VL1 to DGND with a 0.1F capacitor. Output Supply Rail. Bypass VCOM to DGND with a 0.1F capacitor. Level Shifter Output Level Shifter Output Level Shifter Output Level Shifter Output Level Shifter Output Level Shifter Output Level Shifter Output Level Shifter Output Level Shifter Output Level Shifter Output Level Shifter Output Level Shifter Output Level Shifter Output Level Shifter Output State/Combinational Logic Select. Connect ST to VCC for state logic and to DGND for combinational logic operation. Output Supply Rail. Bypass VH1 to DGND with a 0.1F capacitor. Output Supply Rail. Bypass VH2 to DGND with a 0.1F capacitor. Upper Supply Rail. Bypass VLS to DGND with a 0.1F capacitor. Input Logic Ground Connection Input Logic Supply Connection. Bypass to AGND with a minimum 0.1F capacitor. FUNCTION
6
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4-Level or 2-Level Logic to High-Voltage Level Shifter for TFT LCD TV Display
Pin Description (continued)
PIN 39 40 -- NAME EN CH EP FUNCTION Enable Input. All outputs connect to VCOM when EN is low. Select Input for Two Level/Four Level. Connect CH to VCC for two-level operation and tie CH to DGND or let it float for four-level operation. For two-level operation, power VH2 and VL2 and control the outputs with Ax inputs. Bx inputs can be left floating or be connected to AGND. Exposed Pad. Connect the exposed backside pad to AGND and DGND.
MAX17079
Detailed Description
The MAX17079 is a 7-channel level shifter that converts a 2-bit logic-level input to a five-level high-voltage output. The outputs are connected to the four output rails (VH1, VH2, VL1, VL2) through 3 switches and to the fifth rail (VCOM) through a 15 switch. The output rails lie between DGND and the upper supply rail (VLS). The MAX17079 has two modes of operation. When ST = VCC, it operates in sequential mode and when ST = AGND, it operates in combinational mode. The MAX17079 can operate in either two-level output or four-level output configuration. In four-level output mode, the output can connect to VH1, VH2, VL2, or VL1, and in two-level output mode, the output can connect to VH2 or VL2. Connect CH to AGND for four-level operation and connect CH to VCC for two-level operation. The output supply rail voltages should satisfy the following condition at all times: VLS VH1 (VH2, VL2, VCOM) VL1 The MAX17079 has built-in dead time to avoid shootthrough current. The propagation delay between input and output is 80ns and the rise time is 30ns. Figure 1 is the MAX17079 typical operating circuit and Figure 2 shows the functional diagram.
Four-Level Combinational Logic
Connect CH and ST to AGND for four-level combinational operation. If EN is LOW or VCC is less than UVLO or VLS is less than its UVLO, the outputs are in STANDBY and the outputs connect to VCOM. After EN is HIGH or VCC is greater than UVLO and VLS is greater than its UVLO, the outputs are ready to respond to logic inputs at Ax, Bx. If EN goes HIGH after a rising or falling edge of Ax or Bx, the device remains in STANDBY state until the next edge comes. All state transitions can be level triggered. The output is determined by the following truth table (Table 1).
Table 1. Truth Table Four-Level Combinational Operation
HIGH (Ax) HIGH (Bx) LOW (Bx) OAx = VH1 OBx = VL1 OAx = VH2 OBx = VL2 LOW (Ax) OAx = VL1 OBx = VH1 OAx = VL2 OBx = VH2
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7
4-Level or 2-Level Logic to High-Voltage Level Shifter for TFT LCD TV Display MAX17079
3.3V 10V 7V 6V 5V 2V 15V
0.1F 0.1F VCC VH1 VH2
0.1F
0.1F
0.1F
0.1F 0.1F
VCOM
VL2
VL1
VLS OA1
OB1 A1 OA2 B1 OB2 A2 B2 OA3
A3 B3
OB3
OA4
MAX17079
A4 OB4 B4
SYSTEM
OA5 A5 B5 OB5
PANEL
A6 B6
OA6
OB6 A7 OA7 B7 OB7 AGND EN VCC DGND CH ST
Figure 1. Typical Operating Circuit
8 _______________________________________________________________________________________
4-Level or 2-Level Logic to High-Voltage Level Shifter for TFT LCD TV Display MAX17079
VCC
EN
VH1
VH2
VCOM
VL2
VL1
VLS
LOGIC
A1 LEVEL SHIFTER B1
OA1 OB1
A2 LEVEL SHIFTER B2
OA2 OB2
A3 LEVEL SHIFTER B3
OA3 OB3
A4 LEVEL SHIFTER B4
OA4 OB4
A5 LEVEL SHIFTER B5
OA5 OB5
A6 LEVEL SHIFTER B6
OA6 OB6
A7 LEVEL SHIFTER B7
OA7 OB7
ST AGND DGND
CH
Figure 2. Functional Diagram
_______________________________________________________________________________________ 9
4-Level or 2-Level Logic to High-Voltage Level Shifter for TFT LCD TV Display MAX17079
Sequential Operation
Connect CH to AGND and ST to VCC for four-level sequential operation. If EN is LOW or VCC is less than its UVLO or VVLS is less than its UVLO, the outputs are in STANDBY and the outputs connect to VCOM. After EN is HIGH, VCC exceeds its UVLO and VLS exceeds its UVLO, the outputs are ready to respond to logic inputs at Ax and Bx. In sequential operation, the logic inputs and corresponding output states sequence only in a predefined order. In four-level operation, it is only possible to progress from STATE 1 to STATE 2 or to STANDBY. The same applies to the other transitions, including from STATE 4 to STATE 1. Table 2 shows the logic states of the level shifter in a sequential mode of operation. Figure 3 shows the sequence of operation. Outputs OAx and OBx always change in the same sequence.
Two-Level Operation
The MAX17079 also has a two-level output voltage operation. Connect CH to VCC for two-level operation. In two-level operation, the device transitions between two states and the outputs can be connected only to VH2 or VL2 or VCOM in STANDBY. Other than the startup condition, there is no way to distinguish between sequential operation and combinational operation. If EN is LOW or VCC is less than its UVLO or VLS is less than its UVLO, the outputs are in STANDBY and the outputs connect to VCOM. After EN is HIGH, VCC is greater than its UVLO and VLS is greater than its UVLO, the outputs are ready to respond to logic inputs at Ax. Connect Bx to AGND, as the outputs respond only to the rising and falling edge of Ax. The outputs transition from VCOM to the specific output only on the rising edge of Ax in sequential mode. In combinational mode, the outputs transition from VCOM to the specific output on either rising or falling edge of Ax. The following truth table (Table 3) shows the output states.
Table 2. Truth Table Four-Level Sequential Mode of Operation
STATE STATE 1 STATE 2 STATE 3 STATE 4 Ax H H L L Bx H L H L OAx VH1 VH2 VL1 VL2 OBx VL1 VL2 VH1 VH2
Table 3. Truth Table Two-Level Operation
HIGH (Ax) LOW (Ax) OAx = VH2, OBx = VL2 OAx = VL2, OBx = VH2
x = Don't care.
EN
Ax
Bx
OAx OBx
Figure 3. Sequential Mode Operation
10
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4-Level or 2-Level Logic to High-Voltage Level Shifter for TFT LCD TV Display
Startup
The MAX17079 supply rail voltages should satisfy the startup sequence shown in Figure 4. The supply rail voltages should also satisfy the following conditions: VLS VH1 (VH2, VL2, VCOM) VL1 For proper operation, EN should be HIGH only after all the supply rails are ON.
Load Characteristics
The load has a typical characteristic of large TFT LCD panels. During state transitions, a built-in dead time prevents shoot-through current. During dead time as the output is not connected, the output can be affected by the panel load. To avoid voltage spikes during the deadline, 1nF to 4.7nF capacitors can be added at each output.
MAX17079
PCB Layout Guidelines
Careful PCB layout is important for proper operation. Use the following guidelines for good PCB layout:
VOLTAGE
VLS VH1 VH2 VCOM VL2 VCC VL1 EN
*
The MAX17079 has a backside pad to dissipate heat. Do not route any trace around or under the backside pad. Ensure good decoupling of supply rails and put the bypass capacitor for each power supply very close to the pin. Create an analog ground island (AGND) that includes the AGND pin and the VCC bypass capacitor to ground. Connect AGND to the backside pad directly under the IC. Create a power ground plane (DGND) that includes the DGND pin, the remaining supply rails bypass capacitor grounds, and output bypass capacitors, if used in the system. Connect DGND to the backside pad directly under the IC. Other than the backside connection, avoid connecting AGND and DGND.
*
*
TIME
Figure 4. Startup Sequence
Chip Information
TRANSISTOR COUNT: 7580 PROCESS: BiCMOS
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11
4-Level or 2-Level Logic to High-Voltage Level Shifter for TFT LCD TV Display MAX17079
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.)
12
______________________________________________________________________________________
QFN THIN.EPS
4-Level or 2-Level Logic to High-Voltage Level Shifter for TFT LCD TV Display
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.)
MAX17079
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.
13 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.

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