9-839; Rev 5; 7/2 SC70/µDFN, Single/Dual Low-oltage, General Description The microprocessor (µp) supervisory circuits monitor power-supply voltages from +.8 to +5.0 while consuming only 3µA of supply current at +.8. Whenever falls below the factory-set reset thresholds, the reset output asserts and remains asserted for a minimum reset timeout period after rises above the reset threshold. Reset thresholds are available from +.58 to +4.63, in approximately 00m increments. Seven minimum reset timeout delays ranging from ms to 200ms are available. The MAX638/MAX6384/MAX6387 have a push-pull active-low reset output. The MAX6382/MAX6385/ MAX6388 have a push-pull active-high reset output, and the MAX6383/MAX6386/MAX6389/MAX6390 have an open-drain active-low reset output. The MAX6384/MAX6385/MAX6386 also feature a debounced manual reset input (with internal pullup resistor). The MAX6387/MAX6388/MAX6389 have an auxiliary input for monitoring a second voltage. The MAX6390 offers a manual reset input with a longer reset timeout period (20ms or 200ms) and a shorter manual reset timeout (40ms or 50ms). The MAX638/MAX6382/MAX6383 are available in 3-pin SC70 and 6-pin µdfn packages and the MAX6384 MAX6390 are available in 4-pin SC70 and 6-pin µdfn packages. Computers Controllers Intelligent Instruments TOP IEW () 2 MAX638 MAX6382 MAX6383 SC70 3 Applications Critical µp and µc Power Monitoring Portable/Battery- Powered Equipment Dual oltage Systems Pin Configurations N.C. 6 5 4 MAX638 MAX6382 MAX6383 2 3 N.C. ( ) IS FOR MAX6382 () µdfn Pin Configurations continued at end of data sheet. N.C Features Factory-Set Reset Threshold oltages Ranging from +.58 to +4.63 in Approximately 00m Increments ±2.5% Reset Threshold Accuracy Over Temperature (-40 C to +25 C) Seven Reset Timeout Periods Available: ms, 20ms, 40ms, 280ms, 560ms, 20ms, 200ms (min) 3 Reset Output Options Active-Low Push-Pull Active-High Push-Pull Active-Low Open-Drain Reset Output State Guaranteed alid Down to = Manual Reset Input (MAX6384/MAX6385/MAX6386) Auxiliary IN (MAX6387/MAX6388/MAX6389) Reset Timeout (20ms or 200ms)/Manual Reset Timeout (40ms or 50ms) (MAX6390) Negative-Going Transient Immunity Low Power Consumption of 6µA at +3.6 and 3µA at +.8 Pin Compatible with MAX809/MAX80/MAX803/MAX6326/MAX6327/ MAX6328/MAX6346/MAX6347/MAX6348, and MAX67/MAX672/MAX673 Tiny 3-Pin/4-Pin SC70 and 6-Pin µdfn Packages PART TEMP RANGE PIN- PACKAGE MAX638LT D_+T -40 C to +25 C 6 µdfn MAX638XR D_+T -40 C to +25 C 3 SC70 M AX 638X R D _/ + T -40 C to +25 C 3 SC70 MAX6382LT D_+T -40 C to +25 C 6 µdfn MAX6382XR D_+T -40 C to +25 C 3 SC70 Note: Insert reset threshold suffix (see Reset Threshold table) after "XR", "XS", or "LT." Insert reset timeout delay (see Reset Timeout Delay table) after "D" to complete the part number. Sample stock is generally held on standard versions only (see Standard ersions table). Standard versions have an order increment requirement of 2500 pieces. Nonstandard versions have an order increment requirement of 0,000 pieces. Contact factory for availability of nonstandard versions. +Denotes a lead(pb)-free/rohs-compliant package. / denotes an automotive qualified part. Ordering Information continued at end of data sheet. Typical Operating Circuit appears at end of data sheet. Selector Guide appears at end of data sheet. For pricing, delivery, and ordering information, please contact Maxim Direct at -888-629-4642, or visit Maxim s website at www.maxim-ic.com. Ordering Information
ABSOLUTE MAXIMUM RATINGS to...-0.3 to +6.0 Open-Drain Output...-0.3 to +6.0, (push-pull output)...-0.3 to ( + 0.3) MR, IN...-0.3 to ( + 0.3) Input Current ( )...20mA Output Current (all pins)...20ma 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 Continuous Power Dissipation (T A = +70 C) 3-Pin SC70 (derate 2.9mW/ C above +70 C)...235mW 4-Pin SC70 (derate 3.mW/ C above +70 C)...245mW 6-Pin µdfn (derate 2.mW/ C above +70 C)...67.7mW Operating Temperature Range...-40 C to +25 C Storage Temperature Range...-65 C to +50 C Lead Temperature (soldering, 0s)...+300 C Soldering Temperature (reflow)...+260 C ( = full range, T A = -40 C to +25 C, unless otherwise specified. Typical values are at T A = +25 C.) (Note ) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operating oltage Range.0 5.5 Supply Current Reset Threshold (See Reset Thresholds table) I CC TH = 5.5, no load 7 3 = 3.6, no load 6 = 2.5, no load 4 7 =.8, no load 3 6 T A = +25 C T A = -40 C to +25 C TH -.5% TH - 2.5% TH TH +.5% TH TH + 2.5% Reset Threshold Tempco TH / C 60 ppm/ C to Reset Delay Reset Timeout Period MAX638 MAX6389 (See Reset Timeout table) Reset Timeout Period MAX6390 MR Input oltage t RP t RP IL falling at 0m/µs from TH + 00m to TH - 00m µa 35 µs D 2 D2 20 40 D3 40 280 D5 280 560 D6 560 20 D4 20 2240 D7 200 2400 MR timeout period D4 40 280 D7 50 300 timeout period D4 20 2240 D7 200 2400 TH < 4 0.3 x 0.7 x IH IL 0.8 TH > 4 IH 2.4 ms ms 2
ELECTRICAL CHARACTERISTICS (continued) ( = full range, T A = -40 C to +25 C, unless otherwise specified. Typical values are at T A = +25 C.) (Note ) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS MR Minimum Input Pulse Width µs MR Glitch Rejection 00 ns MR to Reset Delay 200 ns MR Internal Pullup Resistance MAX638 MAX6389 32 63 00 kω MAX6390 500 560 3000 Ω T A = +25 C.245.27.295 IN Input Threshold THRST T A = 0 C to +85 C.232.308 T A = -40 C to +25 C.29.32 IN to Delay IN falling at 4m/µs from THRST + 40m to THRST - 40m 4.5 µs IN Input Leakage Current I IN -50 ± +50 na Open-Drain Output oltage 4.5, I SINK = 3.2mA, reset asserted 0.4 OL 2.5, I SINK =.2mA, reset asserted 0.3.0, I SINK = 80µA, reset asserted 0.3 Open-Drain Output Leakage Current I LKG > TH, not asserted.0 µa 4.5, I SINK = 3.2mA, reset asserted 0.4 OL 2.5, I SINK =.2mA, reset asserted 0.3.0, I SINK = 80µA, reset asserted 0.3 Push-Pull Output oltage OH 4.5, I SOURCE = 800µA, reset not asserted 2.5, I SOURCE = 500µA, reset not asserted 4.5, I SOURCE = 800µA, reset asserted Push-Pull Output oltage OH 2.5, I SOURCE = 500µA, reset asserted.8, I SOURCE = 50µA, reset asserted.0, I SOURCE = µa, reset asserted OL 4.5, I SINK = 3.2mA, reset not asserted 2.5, I SINK =.2mA, reset not asserted 0.4 0.3 Note : Specifications over temperature are guaranteed by design, not production tested. 3
(T A = +25 C, unless otherwise noted.) SUPPLY CURRENT (µa) 9 8 7 6 5 4 3 2 0 SUPPLY CURRENT vs. TEMPERATURE (NO LOAD) = +5.5 = +2.5 = +3.6-40 -25-0 5 20 35 50 65 80 95 0 25 TEMPERATURE ( C) = +.8 MAX638/90 toc0 POWER-DOWN DELAY (µs) 43 4 39 37 35 33 3 29 27 25 POWER-DOWN DELAY vs. TEMPERATURE = +.8-40 -25-0 5 20 35 50 65 80 95 0 25 TEMPERATURE ( C) Typical Operating Characteristics = +3 MAX638/90 toc02 NORMALIZED TIMEOUT PERIOD.08.06.04.02.00 0.98 0.96 0.94 NORMALIZED POWER-UP TIMEOUT vs. TEMPERATURE -40-25 -0 5 20 35 50 65 80 95 0 25 TEMPERATURE ( C) MAX638/90 toc03 NORMALIZED THRESHOLD.020.05.00.005.000 0.995 0.990 0.985 NORMALIZED THRESHOLD vs. TEMPERATURE MAX638/90 toc04 OL ().2.0 0.8 0.6 0.4 0.2 OUTPUT-OLTAGE LOW vs. SINK CURRENT = +3.0 = +4.5 MAX638/90 toc05 OH () 3.0 2.5 2.0.5.0 0.5 OUTPUT-OLTAGE HIGH vs. SOURCE CURRENT = +.8 = +2.5 MAX638/90 toc06 0.990-40 -25-0 5 20 35 50 65 80 95 0 25 TEMPERATURE ( C) 0 0 3 6 9 2 I SINK (ma) 0 0 250 500 750 000 250 500 I SOURCE (µa) MAXIMUM TRANSIENT DURATION (µs) 500 450 400 350 300 250 200 50 00 50 MAXIMUM TRANSIENT DURATION vs. COMPARATOR OERDRIE ASSERTED ABOE THIS LINE MAX638/90 toc07 IN DELAY (µs) 5.5 5.3 5. 4.9 4.7 4.5 4.3 4. 3.9 3.7 IN TO DELAY vs. TEMPERATURE MAX638/90 toc08 0 0 00 000 COMPARATOR OERDRIE, TH - (m) 3.5-40 -25-0 5 20 35 50 65 80 95 0 25 TEMPERATURE ( C) 4
µdfn (MAX6382/ MAX6385/ MAX6388) (MAX638/ MAX6383/ MAX6384/ MAX6386/ MAX6387/ MAX6390) 2, 3, 5 (MAX638/ MAX6382/ MAX6383) 2, 5 (MAX6384 MAX6390) 3 (MAX6384/ MAX6385/ MAX6386/ MAX6390) 3 (MAX6387/ MAX6388/ MAX6389) 4 (MAX638 MAX6390) 6 (MAX638 MAX6390) 3-PIN SC70 PIN MAX6384/ MAX638/ MAX6383 MAX6382 MAX6386/ MAX6390 4-PIN SC70 MAX6385 MAX6387/ MAX689 MAX6388 NAME 2 2 2 2 2 2 N.C. 3 3 MR 3 3 IN Pin Description FUNCTION Active-High Push-Pull Reset Output. changes from low to high when any monitored voltage ( or IN ) drops below the reset threshold or MR is pulled low. remains high for the reset timeout period after monitored voltages exceed the reset thresholds or MR is released. Acti ve- Low Op en- D r ai n/p ush- P ul l Reset Outp ut. RE S E T chang es fr om hi g h to l ow w hen any m oni tor ed vol tag e ( C C or RE S E TIN ) d r op s b el ow the r eset thr eshol d or M R i s p ul l ed l ow. RE S E T r em ai ns l ow for the r eset ti m eout p er i od after the m oni tor ed vol tag es exceed the r eset thr eshol d s or M R i s r el eased. O p en- d r ai n r eq ui r es an exter nal p ul l up r esi stor. No Connection. Not Internally connected. Active-Low Manual Reset Input. Drive low to force a reset. Reset remains active as long as MR is low and for the reset timeout period after MR is released. Leave unconnected or connect to if unused. MR has an internal 63kΩ (.56kΩ for MAX6390) pullup resistor to. Auxi l i ar y Reset Inp ut. H i g h- i m p ed ance i np ut to the auxi l i ar y r eset com p ar ator. C onnect RE S E T IN to the center p oi nt of an exter nal r esi stor vol tag e- d i vi d er netw or k to set the r eset thr eshol d vol tag e. Reset asser ts w hen ei ther C C or RE S E T IN fal l s b el ow i ts thr eshol d vol tag e. 3 3 4 4 4 4 Supply oltage for the device and input for fixed reset threshold monitor. Ground 5
Detailed Description Output A µp reset input starts the µp in a known state. These µp supervisory circuits assert reset to prevent code execution errors during power-up, power-down, or brownout conditions. Reset asserts when is below the reset threshold; once exceeds the reset threshold, an internal timer keeps the reset output asserted for the reset timeout period. After this interval, reset output deasserts. Reset output is guaranteed to be in the correct logic state for. Manual Reset Input (MAX6384/ MAX6385/MAX6386/MAX6390) Many µp-based products require manual reset capability, allowing the operator, a test technician, or external logic circuitry to initiate a reset. A logic low on MR asserts reset. Reset remains asserted while MR is low, and for the reset active timeout period (t RP ) after MR returns high. This input has an internal 63kΩ pullup resistor (.56kΩ for MAX6390), so it can be left unconnected if it is not used. MR can be driven with TTL or CMOS logic levels, or with open-drain/collector outputs. Connect a normally open momentary switch from MR to to create a manual-reset function; external debounce circuitry is not required. If MR is driven from long cables or if the device is used in a noisy environment, connecting a 0.µF capacitor from MR to provides additional noise immunity. IN Comparator (MAX6387/MAX6388/MAX6389) IN is compared to an internal +.27 reference. If the voltage at IN is less than.27, reset asserts. Use the IN comparator as a useradjustable reset detector or as a secondary power-supply monitor by implementing a resistor-divider at IN (shown in Figure ). Reset asserts when either or IN falls below its respective threshold voltage. Use the following equation to set the threshold: INTH = THRST (R/R2 + ) where THRST = +.27. To simplify the resistor selection, choose a value of R2 and calculate R: R = R2 [( INTH / THRST ) - ] Since the input current at IN is 50nA (max), large values can be used for R2 with no significant loss in accuracy. Reset Thresholds (-40 C to +25 C) SUFFIX TH (min) TH (nom) TH (max) 46 4.5 4.63 4.74 45 4.39 4.50 4.6 44 4.27 4.38 4.48 43 4.9 4.30 4.4 42 4.0 4.20 4.3 4 4.00 4.0 4.20 40 3.90 4.00 4.0 39 3.80 3.90 4.00 38 3.7 3.80 3.90 37 3.6 3.70 3.79 36 3.5 3.60 3.69 35 3.4 3.50 3.59 34 3.32 3.40 3.49 33 3.22 3.30 3.38 32 3.2 3.20 3.28 3 3.00 3.08 3.5 30 2.93 3.00 3.08 29 2.85 2.93 3.00 28 2.73 2.80 2.87 27 2.63 2.70 2.77 26 2.56 2.63 2.69 25 2.44 2.50 2.56 24 2.34 2.40 2.46 23 2.26 2.3 2.37 22 2.3 2.9 2.24 2 2.05 2.0 2.5 20.95 2.00 2.05 9.85.90.95 8.76.80.85 7.62.67.7 6.54.58.6 Applications Information Negative-Going CC Transients In addition to issuing a reset to the µp during power-up, power-down, and brownout conditions, the are relatively immune to short duration negative-going transients (glitches). The Typical Operating Characteristics section shows the Maximum Transient Durations vs. Reset Comparator Overdrive, for which the do not generate a reset pulse. This graph was generated using 6
IN R R2 IN Figure. IN Configuration MAX6387 MAX6388 MAX6389 () ( ) IS FOR MAX6388 a negative-going pulse applied to, starting above the actual reset threshold and ending below it by the magnitude indicated (reset comparator overdrive). The graph indicates the typical maximum pulse width a negative-going transient may have without causing a reset pulse to be issued. As the magnitude of the transient increases (goes farther below the reset threshold), the maximum allowable pulse width decreases. A 0.µF capacitor mounted as close as possible to provides additional transient immunity. Ensuring a alid Output Down to CC = 0 The are guaranteed to operate properly down to =. In applications that require valid reset levels down to = 0, a pulldown resistor to active-low outputs (push/pull only, Figure 2) and a pullup resistor to active-high outputs (push/pull only) will ensure that the reset line is valid while the reset output can no longer sink or source current. This scheme Reset Timeout Delay SUFFIX MIN D ms D2 20ms D3 40ms D5 280ms D6 560ms D4 20ms D7 200ms MAX6390 D4 20/40ms* MAX6390 D7 200/50ms* *The MAX6390 has a 20ms or 200ms timeout and a 40ms or 50ms manual reset timeout. MAX638 MAX6384 MAX6387 Figure 2. alid to = Ground Circuit R 00k does not work with the open-drain outputs of the MAX6383/MAX6386/MAX6389/MAX6390. The resistor value used is not critical, but it must be small enough not to load the reset output when is above the reset threshold. For most applications, 00kΩ is adequate. PART MAX638_ MAX6390 THRESHOLD 46 44 3 29 26 23 22 7 6 46 44 3 29 26 23 22 7 6 Standard ersions TIMEOUT D3 D4 7
PART NUMBER PUSH-PULL ACTIE-LOW X PUSH-PULL ACTIE-HIGH OPEN-DRAIN ACTIE-LOW MANUAL INPUT MR Selector Guide IN MAX638 MAX6382 X MAX6383 X MAX6384 X X MAX6385 X X MAX6386 X X MAX6390* X X MAX6387 X X MAX6388 X X MAX6389 X X *The MAX6390 offers a reset timeout of 20ms or 200ms (min) and a manual reset timeout of 40ms or 50ms (min). Typical Operating Circuit Ordering Information (continued) CORE R R I/O SUPPLY IN ** MR * PUSHBUTTON SWITCH () CORE OLTAGE INPUT *MR is for MAX6384/MAX6385/MAX6386/MAX6390 ** IN is for MAX6387/MAX6388/MAX6389 ( ) are for MAX6382/MAX6385/MAX6388 I/O OLTAGE P PART TEMP RANGE PIN- PACKAGE MAX6383LT D_+T -40 C to +25 C 6 µdfn MAX6383XR D_+T -40 C to +25 C 3 SC70 MAX6384LT D_+T -40 C to +25 C 6 µdfn MAX6384XS D_+T -40 C to +25 C 4 SC70 MAX6385LT D_+T -40 C to +25 C 6 µdfn MAX6385XS D_+T -40 C to +25 C 4 SC70 MAX6386LT D_+T -40 C to +25 C 6 µdfn MAX6386XS D_+T -40 C to +25 C 4 SC70 MAX6387LT D_+T -40 C to +25 C 6 µdfn MAX6387XS D_+T -40 C to +25 C 4 SC70 MAX6388LT D_+T -40 C to +25 C 6 µdfn MAX6388XS D_+T -40 C to +25 C 4 SC70 MAX6389LT D_+T -40 C to +25 C 6 µdfn MAX6389XS D_+T -40 C to +25 C 4 SC70 MAX6390LT D_+T -40 C to +25 C 6 µdfn MAX6390XS D_+T* -40 C to +25 C 4 SC70 Note: Insert reset threshold suffix (see Reset Threshold table) after "XR", "XS", or "LT." Insert reset timeout delay (see Reset Timeout Delay table) after "D" to complete the part number. Sample stock is generally held on standard versions only (see Standard ersions table). Standard versions have an order increment requirement of 2500 pieces. Nonstandard versions have an order increment requirement of 0,000 pieces. Contact factory for availability of nonstandard versions. *MAX6390 is available with D4 or D7 timing only. +Denotes a lead(pb)-free/rohs-compliant package. 8
TOP IEW MAX6384 MAX6385 MAX6386 MAX6390 4 Pin Configurations (continued) 2 3 2 () 3 MR N.C. MR () µdfn SC70 ( ) IS FOR MAX6385 ( ) IS FOR MAX6385 6 5 4 N.C. MAX6384 MAX6385 MAX6386 MAX6390 N.C. 4 6 5 4 MAX6387 MAX6388 MAX6389 MAX6387 MAX6388 MAX6389 () ( ) IS FOR MAX6388 2 SC70 3 IN ( ) IS FOR MAX6388 2 3 () N.C. µdfn IN PROCESS: BiCMOS Chip Information 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 PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 3 SC70 X3+2 2-0075 90-0208 4 SC70 X4+ 2-0098 90-087 6 µdfn L6+ 2-047 90-0080 9
Revision History REISION REISION PAGES DESCRIPTION NUMBER DATE CHANGED 0 0/00 Initial release 3 2/05 Added lead-free notation to Ordering Information., 8 4 4/07 Added µdfn package to data sheet., 2, 5, 7 3 5 7/2 Added automotive package to Ordering Information. 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. The parametric values (min and max limits) shown in the Electrical. Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. 0 Maxim Integrated Products, Inc. 60 Rio Robles, San Jose, CA 9534 USA -408-60-000 202 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.