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19-1508; Rev 6; 12/05
Dual/Triple-Voltage P Supervisory Circuits
General Description
The MAX6351-MAX6360 microprocessor (P) supervisors with multiple reset voltages significantly improve system reliability and accuracy compared to separate ICs or discrete components. If any input supply voltage drops below its associated preset threshold, all reset outputs are asserted. In addition, the outputs are valid as long as either input supply voltage remains greater than +1.0V. All devices in this series have an active-low debounced manual reset input. In addition, the MAX6358/MAX6359/ MAX6360 offer a watchdog-timer input with a 46.4s startup timeout period and a 2.9s timeout period. The MAX6355/MAX6356/MAX6357 offer an additional voltage monitor input to monitor a third voltage. The MAX6351 features two active-low, push-pull reset outputs, one is referenced to VCC1 and the other is referenced to VCC2. The MAX6353/MAX6356/MAX6359 offer an active-low, push-pull reset output referenced to VCC1. The MAX6354/MAX6357/MAX6360 offer an active-low, push-pull reset output referenced to VCC2. All these devices are offered with a wide variety of voltage threshold levels, as shown in the Voltage Threshold Levels table. They are available in 5- and 6-pin SOT23 packages and operate over the extended (-40C to +85C) temperature range.
Features
Precision Monitoring of Multiple +1.8V, +2.5V, +3.0V, +3.3V, and +5V Power-Supply Voltages Precision Factory-Set Power-Supply Reset Thresholds 20A Supply Current 100ms min Power-On Reset Pulse Width Debounced TTL/CMOS-Compatible Manual-Reset Input Watchdog Timer 46.4s Startup Timeout 2.9s Normal Timeout Fully Guaranteed Over Temperature Guaranteed RESET Valid to VCC1 = 1V or VCC2 = 1V Power-Supply Transient Immunity No External Components for Dual-Voltage Systems Small 5- and 6-Pin SOT23 Packages Low Cost
MAX6351-MAX6360
__________Voltage Threshold Levels
PART NO. SUFFIX (_ _) LT LS LR MT MS MR TZ TY TW TV SZ SY SW VCC1 NOMINAL VOLTAGE THRESHOLD (V) 4.63 4.63 4.63 4.38 4.38 4.38 3.08 3.08 3.08 3.08 2.93 2.93 2.93 VCC2 NOMINAL VOLTAGE THRESHOLD (V) 3.08 2.93 2.63 3.08 2.93 2.63 2.32 2.19 1.67 1.58 2.32 2.19 1.67
Applications
Computers Controllers Portable/Battery-Powered Equipment Intelligent Instruments Multivoltage Systems
Ordering Information
PART* MAX6351_ _UT-T MAX6352_ _UK-T MAX6353_ _UK-T MAX6354_ _UK-T MAX6355_ _UT-T MAX6356_ _UT-T MAX6357_ _UT-T TEMP RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 6 SOT23-6 5 SOT23-5 5 SOT23-5 5 SOT23-5 6 SOT23-6 6 SOT23-6 6 SOT23-6
MAX6358_ _UT-T -40C to +85C 6 SOT23-6 MAX6359_ _UT-T -40C to +85C 6 SOT23-6 MAX6360_ _UT-T -40C to +85C 6 SOT23-6 SV 2.93 1.58 *The _ _ are placeholders for the threshold voltage levels of the UW 2.78 1.67 devices. Substitute the part number suffix in the Voltage ThresUV 2.78 1.58 hold Levels table for the desired voltage level. All devices are available in tape-and-reel only. There is a 2500 piece minimum RW 2.63 1.67 order increment for the SOT package. RV 2.63 1.58 Devices are available in both leaded and lead-free packaging. Note: Standard versions are shown in bold. Sample stock is genSpecify lead-free by replacing "-T" with "+T" when ordering. erally held on the standard versions only. Contact factory for availPin Configurations appear at end of data sheet. ability. Selector Guide appears at end of data sheet. ________________________________________________________________ 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.
Dual/Triple-Voltage P Supervisory Circuits MAX6351-MAX6360
ABSOLUTE MAXIMUM RATINGS
VCC1, VCC2 to GND .................................................-0.3V to +6V RST (MAX6352/MAX6355/MAX6358)...................... -0.3V to +6V RST, MR, WDI, RST1, RSTIN (MAX6351/MAX6353/ MAX6356/MAX6359) ..............................-0.3V to (VCC1 + 0.3V) RST, RST2 (MAX6351/MAX6354/ MAX6357/MAX6360) ..............................-0.3V to (VCC2 + 0.3V) Input/Output Current, All Pins .............................................20mA Continuous Power Dissipation (TA = +70C) 5-Pin SOT23 (derate 7.1mW/C above +70C)............571mW 6-Pin SOT23 (derate 8.7mW/C above +70C)............695mW Operating Temperature Range ...........................-40C to +85C Junction Temperature .....................................................+150C Storage Temperature Range .............................-65C to +150C
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
(VCC1 = VCC2 = +1.2V to +5.5V, TA = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Supply Voltage Supply Current SYMBOL VCC1, VCC2 ICC1 + ICC2 CONDITIONS TA = 0C to +70C TA = -40C to +85C VCC1 = 5.5V, VCC2 = 3.6V, all I/O pins open MAX63_ _L_ MAX63_ _M_ MAX63_ _T_ VCC1 Threshold (Note 3) VTH1 MAX63_ _S_ MAX63_ _U_ MAX63_ _R_ MAX63_ _ _T MAX63_ _ _S MAX63_ _ _R VCC2 Threshold (Note 3) VTH2 MAX63_ _ _Z MAX63_ _ _Y MAX63_ _ _W MAX63_ _ _V TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C 4.54 4.5 4.3 4.25 3.03 3.00 2.88 2.85 2.74 2.70 2.58 2.55 3.03 3.00 2.88 2.85 2.58 2.55 2.28 2.25 2.16 2.13 1.64 1.62 1.55 1.53 1.58 1.67 2.19 2.32 2.63 2.93 3.08 2.63 2.78 2.93 3.08 4.38 MIN 1.0 1.2 20 4.63 TYP MAX 5.5 5.5 50 4.72 4.75 4.46 4.50 3.14 3.15 2.98 3.00 2.82 2.85 2.68 2.70 3.14 3.15 2.98 3.00 2.68 2.70 2.35 2.38 2.22 2.25 1.70 1.71 1.61 1.62 V V UNITS V A
2
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Dual/Triple-Voltage P Supervisory Circuits MAX6351-MAX6360
ELECTRICAL CHARACTERISTICS (continued)
(VCC1 = VCC2 = +1.2V to +5.5V, TA = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Reset Threshold Tempco Reset Threshold Hysteresis VCC to Reset Delay Reset Timeout Period tRP 100mV overdrive VCC1 > VTH1 (MAX), VCC2 > VTH2 (MAX) VCC1 or VCC2 2.7V, ISINK = 1.2mA VCC1 or VCC2 4.5V, ISINK = 3.2mA RESET Output Voltage Low VOL VCC1 or VCC2 1V, ISINK = 50A, TA = 0C to +70C VCC1 or VCC2 1.2V, ISINK = 50A; TA = -40C to +85C (_W, _V versions only), VCC1 > VTH1(MAX), ISOURCE = 350A VCC2 > VTH2(MAX) VOH (_Y versions only), VCC1 > VTH1(MAX), VCC2 > VTH2(MAX) ISOURCE = 500A 0.8 x VCC 100 SYMBOL VTH/C CONDITIONS MIN TYP 20 VTH/500 20 180 280 0.3 0.4 0.3 0.3 V MAX UNITS ppm/C V s ms
RESET Output Voltage High (MAX6351/MAX6353/MAX6354/ MAX6356/MAX6357/MAX6359/ MAX6360 only)
0.8 x VCC
V
(_T, _S, _R versions only), VCC1 > VTH1(MAX), ISOURCE = 800A VCC2 > VTH2(MAX) WATCHDOG INPUT (MAX6358/MAX6359/MAX6360) Watchdog Timeout Period WDI Pulse Width (Note 4) WDI Input Voltage (Note 5) WDI Input Current (Note 6) MANUAL RESET INPUT VIL MR Input Voltage VIH VIL VIH MAX63_ _L_, MAX63_ _M_, VCC1 > VTH1(MAX) MAX63_ _L_, MAX63_ _M_, VCC1 > VTH1(MAX) MAX63_ _ _Y, VCC1 > VTH1(MAX) MAX63_ _ _Y, VCC1 > VTH1(MAX) tWD tWDI VIL VIH First timeout period after reset After first WDI falling edge VIL = 0.4V, VIH = 0.8 x VCC VCC1 = 5V VWDI = VCC VWDI = 0
VCC - 1.5
25.6 1.6 50
46.4 2.9
72.0 4.5 0.3 x VCC
s ns V A
0.7 x VCC 120 -20 -15 0.8 2.3 0.3 x VCC 0.7 x VCC 160
V
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3
Dual/Triple-Voltage P Supervisory Circuits MAX6351-MAX6360
ELECTRICAL CHARACTERISTICS (continued)
(VCC1 = VCC2 = +1.2V to +5.5V, TA = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER MR Pullup Resistance MR Minimum Pulse Width MR Glitch Rejection MR to Reset Delay tMD VCC1 > VTH1(MAX), VCC2 > VTH2(MAX) TA = +25C TA = -40C to +85C 1.20 1.19 -25 2.5 ADJUSTABLE RESET COMPARATOR INPUT (MAX6355/MAX6356/MAX6357) RSTIN Input Threshold RSTIN Input Current RSTIN Hysteresis VRSTIN IRSTIN 1.22 1.24 1.25 25 V nA mV tRP SYMBOL CONDITIONS MIN 32 1 100 0.1 TYP 63.5 MAX 100 UNITS k s ns s
0 < VRSTIN < VCC1 - 0.3V
Note 1: Overtemperature limits are guaranteed by design and not production tested. Note 2: The reset output is guaranteed to be in the correct state if either VCC1 or VCC2 is within its specified region of operation. Note 3: The reset output(s) is asserted if either VCC1 or VCC2 drops below its associated trip point. Note 4: Guaranteed by design. Not production tested. Note 5: WDI is internally serviced within the watchdog timeout period if WDI is left unconnected. Note 6: The WDI input current is specified as the average input current when the WDI input is driven high or low.
Typical Operating Characteristics
(VCC1 = +5V, TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
MAX6351/60-01
RESET vs. VCC1 (VCC2 > VTH2)
MAX6351/60-02
RESET vs. VCC1 (VCC2 = GND)
4.5 4.0 3.5 RESET (V)
MAX6351/60-03
20 ICC1 (VCC1 = 5.0V, VCC2 = 3.3V) SUPPLY CURRENT (A) 15 ICC1 (VCC1 = 3.3V, VCC2 = 2.5V) 10
5.0 4.5 4.0 3.5 RESET (V) 3.0 2.5 2.0 1.5 1.0 VTH
5.0
3.0 2.5 2.0 1.5 1.0
5
ICC2 (VCC1 = 5.0V, VCC2 = 3.3V) ICC2 (VCC1 = 3.3V, VCC2 = 2.5V)
0.5 0 MAX6356L_ 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 VCC1 (V) 85
0.5 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 VCC1 (V)
0 -40 -15 10 35 60 TEMPERATURE (C)
4
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Dual/Triple-Voltage P Supervisory Circuits MAX6351-MAX6360
Typical Operating Characteristics (continued)
(VCC1 = +5V, TA = +25C, unless otherwise noted.)
NORMALIZED RESET/WATCHDOG PERIOD vs. TEMPERATURE
MAX6351/60-04
MAXIMUM VCC TRANSIENT DURATION vs. RESET THRESHOLD OVERDRIVE
MAX6351/60-05
RESET DELAY vs. RESET THRESHOLD OVERDRIVE
MAX6351/60-06
1.20 1.15 NORMALIZED PERIOD 1.10 1.05 1.00 0.95 0.90 0.85 0.80 -60 -40 -20 0 20 40 60 80
300 RESET OCCURS ABOVE LINE 250 TRANSIENT DURATION (s) 200 150 100 50 0
250
200 RESET DELAY (s)
150
100 DELAY FROM FALL OF VCC2 50 DELAY FROM FALL OF VCC1 0
100
0.01
0.1
1
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 RESET THRESHOLD OVERDRIVE, VRST - VCC (V)
TEMPERATURE (C)
RESET THRESHOLD OVERDRIVE, VRST - VCC (V)
PULLUP CHARACTERISTICS
MAX6351/60-07
MANUAL RESET INPUT TO OUTPUT DELAY
MAX6351/60-08
5V 0
RST1 PUSH-PULL OUTPUT
5V
MR
0 5V OPEN-DRAIN OUTPUT RPULLUP = 100k CLOAD = 10pF RST2 PUSH-PULL OUTPUT 400ns/div 0 3V 0
OPEN-DRAIN OUTPUT
RPULLUP = 100k CLOAD = 10pF
5V 0
RST2 PUSH-PULL OUTPUT RST1 PUSH-PULL OUTPUT 40ns/div
5V 0 5V 0
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5
Dual/Triple-Voltage P Supervisory Circuits MAX6351-MAX6360
Pin Description
PIN MAX6351 1 MAX6352 MAX6353 MAX6354 -- MAX6355 MAX6356 MAX6357 -- MAX6358 MAX6359 MAX6360 -- NAME FUNCTION
RST1
Active-Low, CMOS Reset Output Referenced to VCC1 Active-Low Reset Output. Open drain for the MAX6352/ MAX6355/MAX6358, push-pull with respect to VCC1 for the MAX6353/MAX6356/MAX6359, and push-pull with respect to VCC2 for the MAX6354/MAX6357/MAX6360. Ground Manual-Reset Input. Pull low to force a reset. RST, RST1, and RST2 remain active as long as MR is low and for the timeout period after MR goes high. Leave unconnected or connect to VCC1 if unused. V MR must not exceed VCC1. Supply Input. Powers the device when it is above VCC1 and monitors its own voltage. Active-Low, CMOS Reset Output Referenced to VCC2 Undervoltage Reset Comparator Input. Asserts reset when the monitored voltage falls below 1.22V. Set the reset threshold with an external resistive divider. Connect to VCC1 if unused. VRSTIN must not exceed VCC1. Watchdog Input. If WDI remains either high or low longer than the timeout period, then reset is triggered. The timer clears when reset is asserted or whenever WDI sees a rising or falling edge. Leave floating to disable it if unused. Supply Input. Powers the device when it is above VCC2 and monitors its own voltage.
--
1
1
1
RST
2
2
2
2
GND
3
3
3
3
MR
4 5
4 --
4 --
4 --
VCC2 RST2
--
--
5
--
RSTIN
--
--
--
5
WDI
6
5
6
6
VCC1
6
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Dual/Triple-Voltage P Supervisory Circuits
Detailed Description
Supply Voltages
The MAX6351-MAX6360 microprocessor (P) supervisory circuits maintain system integrity by alerting the P to fault conditions. These ICs monitor multiple-supply systems. The output reset state is guaranteed to remain viable while either VCC1 or VCC2 is above +1V.
Reset Outputs
The MAX6351 provides two active-low, push-pull reset outputs, one corresponding to each of its two monitored voltages. The MAX6353/MAX6356/MAX6359 have an active-low, push-pull reset output that is referenced to VCC1. The MAX6354/MAX6357/MAX6360 have an active-low, push-pull reset output that is referenced to VCC2. The MAX6352/MAX6355/MAX6358 provide an active-low open-drain reset. The reset outputs are maintained as long as at least one of the supplies is above +1V.
MAX6351-MAX6360
Threshold Levels
All the possible input voltage threshold level combinations are indicated by a two-letter code in the Voltage Threshold Levels table.
3 MR (5) 6 VCC1 GLITCH FILTER
Negative-Going VCC Transients The MAX6351-MAX6360 are designed to ignore short negative-going V CC 1 and V CC 2 transients. See the Maximum VCC Transient Duration vs. Reset Threshold Overdrive graph in the Typical Operating Characteristics. Third Input Voltage (MAX6355/MAX6356/MAX6357)
The MAX6355/MAX6356/MAX6357 provide an additional input to monitor a third voltage. The threshold voltage at RSTIN is typically 1.22V. To monitor a voltage higher than 1.22V, connect a resistive divider to the circuit as shown in Figure 2. The threshold at VEXT is: R1 + R2 VEXT_TH = 1.22V R2 Note that RSTIN is powered by VCC1, and its voltage must therefore remain lower than or equal to VCC1.
VTH1 RST (1)
4 VCC2 RESET GENERATOR RST2 (5)
VTH2
RST1 (1)
Watchdog Input (MAX6358/MAX6359/MAX6360)
The MAX6358/MAX6359/MAX6360 include a dualmode watchdog timer to monitor P activity. The flexible timeout architecture provides a startup mode, allowing complicated systems to complete lengthy boots, and a normal mode, allowing the supervisor to provide quick alerts when processor activity fails.
(5) (RSTIN)
1.22V
(5) (WDI)
WATCHDOG TIMER
VEXT R1
MAX6355 MAX6356 MAX6357
RSTIN
2
GND
MAX6351-MAX6360
R2
NOTE: PIN 1 IS RST1 FOR THE MAX6351 AND RST FOR THE MAX6352-MAX6360. PIN 5 IS RST2 FOR THE MAX6351, RSTIN FOR THE MAX6355/MAX6356/MAX6357, WDI FOR THE MAX6358/ MAX6359/MAX6360, AND VCC1 FOR THE MAX6352/MAX6353/MAX6354.
VCC1 VRSTIN
Figure 1. Functional Diagram
Figure 2. Monitoring a Third Voltage 7
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Dual/Triple-Voltage P Supervisory Circuits MAX6351-MAX6360
During the normal operating mode, the supervisor will issue a reset pulse for the reset timeout period (140ms min) if the P does not update the WDI with a valid transition (HIGH to LOW or LOW to HIGH) within the standard timeout period (1.6s min). After each reset event (VCC power-up, manual reset, or watchdog reset), there is an initial watchdog startup timeout period of 25.6s. The startup mode provides an extended period for the system to power up and fully initialize all P and system components before assuming responsibility for routine watchdog updates. The normal watchdog timeout period (1.6s min) begins at the conclusion of the startup timeout period or after the first transition on WDI before the conclusion of the startup period (Figure 3).
VCC2 VCC1
VCC1 VCC2
RST RST2 RST1 100k
MAX6351 MAX6356 MAX6353 MAX6357 MAX6354 MAX6359 MAX6360
GND
Applications Information
Ensuring a Valid RESET Output Down to VCC = 0
In some systems, it is necessary to ensure a valid reset even if VCC falls to 0. In these applications, use the circuit shown in Figure 4. Note that this configuration does not work for the open-drain outputs of the MAX6352/ MAX6355/MAX6358.
Figure 4. Ensuring a Valid Reset Low to VCC1 and VCC2 = 0
BUFFERED RESET TO OTHER SYSTEM COMPONENTS VCC2 VCC1
Interfacing to Ps with Bidirectional Reset Pins
Microprocessors with bidirectional reset pins will contend with the push-pull outputs of these devices. To prevent this, connect a 4.7k resistor between RESET and the P's reset I/O port, as shown in Figure 5. Buffer RESET as shown in the figure if this reset is used by other components in the system.
VCC1 VCC2 RST RST2 RST1 4.7k RESET
P
MAX6351-MAX6360
GND
GND
VTH VCC tWDI-NORMAL 1.6s MAX tWDI-STARTUP 25.6s MAX WDI 1.6s MAX RESET 140ms
Figure 5. Interfacing to Ps with Bidirectional Reset I/O
Chip Information
TRANSISTOR COUNT: 855
Figure 3. Normal Watchdog Startup Sequence
8
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Dual/Triple-Voltage P Supervisory Circuits
Pin Configurations
TOP VIEW
RST1 1
6
VCC1
RST* 1
5
VCC1 *MAX6352: OPEN-DRAIN OUTPUT *MAX6353: PUSH-PULL OUTPUT (VCC1) *MAX6354: PUSH-PULL OUTPUT (VCC2)
GND 2
MAX6351
5
RST2
GND 2
MAX6352 MAX6353 MAX6354
4 VCC2
MR 3
4
VCC2
MR 3
SOT23-6
SOT23-5
RST* 1
6
VCC1
RST* 1
6
VCC1
GND 2
MAX6355 MAX6356 MAX6357
5
RSTIN *MAX6355: OPEN-DRAIN OUTPUT GND 2 *MAX6356: PUSH-PULL OUTPUT (VCC1) *MAX6357: PUSH-PULL OUTPUT (VCC2) VCC2 MR 3
MAX6358 MAX6359 MAX6360
5
WDI
*MAX6358: OPEN-DRAIN OUTPUT *MAX6359: PUSH-PULL OUTPUT (VCC1) *MAX6360: PUSH-PULL OUTPUT (VCC2)
MR 3
4
4
VCC2
SOT23-6
SOT23-6
Selector Guide
PART MAX6351 MAX6352 MAX6353 MAX6354 MAX6355 MAX6356 MAX6357 MAX6358 MAX6359 MAX6360 PIN COUNT 6 5 5 5 6 6 6 6 6 6 NUMBER OF SUPPLIES MONITORED 2 2 2 2 3 3 3 2 2 2 RST1 -- -- -- -- -- -- RST2 -- -- -- -- -- -- OPEN-DRAIN RESET -- -- -- -- -- -- -- WATCHDOG TIMER -- -- -- -- -- -- -- MANUAL RESET
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9
Dual/Triple-Voltage P Supervisory Circuits MAX6351-MAX6360
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.)
6LSOT.EPS
PACKAGE OUTLINE, SOT 6L BODY
21-0058
G
1
1
10
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Dual/Triple-Voltage P Supervisory Circuits
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.)
SOT-23 5L .EPS
MAX6351-MAX6360
PACKAGE OUTLINE, SOT-23, 5L
21-0057
E
1
1
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.
11 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.

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