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Part: MAX6351__UT-T
Category:
Power Management
-> Supervisory Circuits
Description: Dual/triple-voltage P Supervisory Circuits
Company: Maxim Integrated Products
Datasheet: Download MAX6351__UT-T datasheet File size : 383 kB
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Datasheet text preview:
19-1508; Rev 1; 10/99
Dual/Triple-Voltage µP Supervisory Circuits
General Description
The MAX6351MAX6360 microprocessor (µP) 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 output(s) is 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 46.4sec start-up timeout period and a 2.9sec timeout period. The MAX6355/MAX6356/MAX6357 offer an additional voltage monitor input to monitor a third voltage. The MAX6351 features both 3V and 5V active-low pushpull reset outputs. The MAX6353/MAX6356/MAX6359 offer a 5V active-low push-pull reset. The MAX6354/ M A X 6 3 5 7 / M A X 6 3 6 0 offer a 3V active-low push-pull r e s e t . The MAX6352/MAX6355/MAX6358's reset is active-low open-drain. All of these devices are offered with a wide variety of v o l t a g e threshold levels, as shown in the Voltage Threshold Levels table below. They are available in 5a n d 6-pin SOT23 packages and operate over the extended (-40°C to +85°C) temperature range.
Features
o Precision Monitoring of Multiple +2.5V, +3.0V, +3.3V, and +5V Power-Supply Voltages o Precision Factory-Set Power-Supply Reset Thresholds o 20µA Supply Current o 100ms min Power-On Reset Pulse Width o Fully Guaranteed Over Temperature o Guaranteed RESET Valid to VCC5 = 1V or VCC3 = 1V o Power-Supply Transient Immunity o No External Components for Dual-Voltage Systems o Small 5- and 6-Pin SOT23 Packages o Debounced TTL/CMOS-Compatible Manual-Reset Input o Watchdog Timer 46.4sec Start-Up Timeout 2.9sec Normal Timeout o Low Cost
MAX6351MAX6360
Applications
Computers Controllers Portable/Battery-Powered Equipment Intelligent Instruments Multivoltage Systems
PART* MAX6351_ _UT-T MAX6352_ _UK-T MAX6353_ _UK-T MAX6354_ _UK-T MAX6355_ _UT-T MAX6356_ _UT-T MAX6357_ _UT-T MAX6358_ _UT-T MAX6359_ _UT-T MAX6360_ _UT-T
Ordering Information
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 PIN-PACKAGE 6 SOT23-6 5 SOT23-5 5 SOT23-5 5 SOT23-5 6 SOT23-6 6 SOT23-6 6 SOT23-6 6 SOT23-6 6 SOT23-6 6 SOT23-6
__________Voltage Threshold Levels
PART NO. SUFFIX (_ _) LT LS LR MT MS MR TY SY VCC5 NOMINAL VOLTAGE THRESHOLD (V) 4.63 4.63 4.63 4.38 4.38 4.38 3.08 2.93 VCC3 NOMINAL VOLTAGE THRESHOLD (V) 3.08 2.93 2.63 3.08 2.93 2.63 2.19 2.19
*The _ _ are placeholders for the threshold voltage levels of the devices. Substitute the part number suffix in the Voltage Threshold Levels table for the desired voltage level. There are two standard versions for each of the above part numbers. All devices are available in tape-and-reel only.
Note: Standard versions are shown in bold and have a required order increment of 2500 pieces. Sample stock is generally held on the standard versions only. The required order increment for nonstandard versions is 10,000 pieces. Contact factory for availability.
Pin Configurations appear at end of data sheet. Selector Guide appears at end of data sheet.
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________________________________________________________________ Maxim Integrated Products
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
Dual/Triple-Voltage µP Supervisory Circuits MAX6351MAX6360
ABSOLUTE MAXIMUM RATINGS
VCC5, VCC3 to GND .......-0.3V to +6V RST (MAX6352/55/58) ............ -0.3V to +6V RST, MR, WDI, RST5, RSTIN (MAX6351/53/56/59).....-0.3V to (VCC5 + 0.3V) RST, RST3 (MAX6351/54/57/60) ........-3V to (VCC3 + 0.3V) Input/Output Current, All Pins ............20mA Continuous Power Dissipation (TA = +70°C) 5-Pin SOT23-5 (derate 7.1mW/°C above +70°C) ........571mW 6-Pin SOT23-6 (derate 7.1mW/°C above +70°C) ........571mW Operating Temperature Range ...-40°C to +85°C Storage Temperature Range .....-65°C to +150°C Lead Temperature (soldering, 10sec) .....+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
(VCC3 = VCC5 = +1.2V to +5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER Supply Voltage Range (Note 2) Supply Current SYMBOL VCC ICC5 + ICC3 CONDITIONS TA = 0°C to +70°C TA = -40°C to +85°C VCC5 = 5.5V, VCC3 = 3.6V, all I/O pins open MAX63_ _L_ MAX63_ _M_ VCC5 Threshold (Note 3) VTH5 MAX63_ _T_ MAX63_ _S_ MAX63_ _ _T MAX63_ _ _S VCC3 Threshold (Note 3) VTH3 MAX63_ _ _R MAX63_ _ _Y Reset Threshold Tempco Reset Threshold Hysteresis VCC to Reset Delay Reset Timeout Period tRP 100mV overdrive VCC5 > VTH5(MAX), VCC3 > VTH3(MAX) VCC5 or VCC3 2.7V, ISINK = 1.2mA VCC5 or VCC3 4.5V, ISINK = 3.2mA RESET Output Voltage Low VOL VCC5 or VCC3 < 1V, ISINK = 50µA, TA = 0°C to +70°C VCC5 or VCC3 < 1.2V, ISINK = 50µA 100 VTH/°C TA = +25°C TA = -40°C to +85°C TA = +25°C TA = -40°C to +85°C TA = +25°C TA = -40°C to +85°C TA = +25°C TA = -40°C to +85°C TA = +25°C TA = -40°C to +85°C TA = +25°C TA = -40°C to +85°C TA = +25°C TA = -40°C to +85°C TA = +25°C TA = -40°C to +85°C 4.54 4.5 4.3 4.25 3.03 3.00 2.88 2.85 3.03 3.00 2.88 2.85 2.58 2.55 2.16 2.13 20 VTH/500 20 180 280 0.3 0.4 0.3 0.3 V V 2.19 2.63 2.93 3.08 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 3.14 3.15 2.98 3.00 2.68 2.70 2.22 2.25 ppm/°C V µs ms V V UNITS V µA
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Dual/Triple-Voltage µP Supervisory Circuits
ELECTRICAL CHARACTERISTICS (continued)
(VCC3 = VCC5 = +1.2V to +5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MAX6351/MAX6353/ MAX6354/MAX6356/ MAX6357/MAX6359/ MAX6360 (_Y versions only), VCC5 > VTH5(MAX), VCC3 > VTH3(MAX) RESET Output Voltage High VOH MAX6351/MAX6353/ MAX6354/MAX6356/ MAX6357/MAX6359/ MAX6360 ISOURCE = 800µA (L_, M_ versions only), VCC5 > VTH5(MAX), VCC3 > VTH3(MAX) WATCHDOG INPUT (MAX6358/MAX6359/MAX6360) Watchdog Timeout Period WDI Pulse Width (Note 4) WDI Input Threshold (Note 5) WDI Input Current (Note 6) MANUAL RESET INPUT VIL MR Input VIH VIL VIH MR Pull-Up Resistance MR Minimum Pulse Width MR Glitch Rejection MR to Reset Delay tMD VCC5 > VTH5(MAX), VCC3 > VTH3(MAX) TA = +25°C TA = -40°C to +85°C 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 MAX63_ _L_, MAX63_ _M_, VCC5 > VTH5(MAX) MAX63_ _L_, MAX63_ _M_, VCC5 > VTH5(MAX) MAX63_ _ _Y, VCC5 > VTH5(MAX) MAX63_ _ _Y, VCC5 > VTH5(MAX) 32 10 100 0.1 63.5 0.3VCC 0.7VCC 100 k µs ns µs 0.8 2.3 V tWD tWDI VIL VIH First timeout period after reset After first WDI falling edge VIL = 0.4V, VIH = 0.8VCC VCC3 = 5V VWDI = VCC VWDI = 0 -20 25.6 1.6 50 0.3VCC 0.7VCC 120 -15 160 46.4 2.9 72.0 4.5 sec ns V µA MIN TYP MAX UNITS
MAX6351MAX6360
ISOURCE = 500µA
0.8VCC
V
VCC - 1.5
0 < VRISTIN < VCC5 - 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 VCC3 or VCC5 is within its specified region of operation. Note 3: The reset output(s) is asserted if either VCC5 or VCC3 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. _______________________________________________________________________________________ 3
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