3-Pin, Low-Power μp Reset Circuits MAX6800/MAX6801/ MAX6802. Benefits and Features. General Description. Typical Operating Circuit.
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1 General Description The MAX6800/MAX6801/ microprocessor (μp) supervisory circuits monitor the power supplies in 2.85 to 5.0 μp and digital systems. They increase circuit reliability and reduce cost by eliminating external components and adjustments. These devices perform a single function they assert a reset signal whenever the CC supply voltage declines below a preset threshold, keeping it asserted for a preset timeout period after CC has risen above the reset threshold. The only difference among the three devices is their output. The MAX6801 (push/pull) and (open-drain) have an active-low output, while the MAX6800 (push/pull) has an active-high output. The devices are guaranteed to be in the correct state for CC down to 0.7. The is guaranteed to be in the correct state for CC down to 1.0. The reset comparator in these ICs is designed to ignore fast transients on CC. Reset thresholds are factorytrimmable between 2.63 and 4.80, in approximately 100m increments. These devices are available with a 1ms (min), 20ms (min), or 100ms (min) reset pulse width. Ideal for space-critical applications, the MAX6800/ MAX6801/ come packaged in a 3-pin SOT23. For a lower threshold voltage version, see the MAX6332/ MAX6333/MAX6334. Applications Computers Controllers Intelligent Instruments Critical μp/μc Power Monitoring Portable/Battery-Powered Equipment Benefits and Features Ultra-Low 0.7 Operating Supply oltage Low 4.0μA Supply Current Precision Monitoring of 2.85 to 5.0 Power- Supply oltages Reset Thresholds Available from 2.63 to 4.80, in Approximately 100m Increments Fully Specified over Temperature Three Power-On Reset Timeout Periods Available (1ms min, 20ms min, 100ms min) Low Cost Three Available Output Structures: Push/Pull, Push/Pull, Open-Drain Guaranteed / alid to CC = 0.7 (MAX6800/MAX6801) Power-Supply Transient Immunity No External Components Required 3-Pin SOT23 Package Pin-Compatible with MAX809/MAX810, MAX6326/MAX6327/MAX6328, and MAX6346/MAX6347/MAX6348 Typical Operating Circuit CC CC CC Selector Guide (Standard ersions*) appears at end of data sheet. MAX6801 µp ; Rev 5; 2/16
2 Absolute Maximum Ratings Terminal oltage (with respect to ) CC to +6 Push/Pull, to ( CC + 0.3) Open-Drain to +6 Input Current ( CC )...20mA Output Current (, )...20mA Continuous Power Dissipation (T A = +70 C) 3-Pin SOT23 (derate 4mW/ C above +70 C)...320mW Operating Temperature Range C to +125 C Junction Temperature C Storage Temperature Range C to +150 C Lead Temperature (soldering, 10s) C Soldering Temperature (reflow) C Lead (Pb)-free packages C Package containing lead (Pb) 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 ( CC = full range, T A = -40 C to +125 C, unless otherwise noted. Typical values are at CC = +5.0 and T A = +25 C, reset not asserted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS MAX6800/MAX T Supply oltage Range A = 0 C to +125 C (Note 2) CC MAX6800/MAX T A = -40 C to +125 C CC = Supply Current I CC No load µa CC = Reset Threshold TH MAX680_UR D_-T, Table 1 T A = +25 C T A = -40 C to +125 C TH - 1.8% TH - 3% Output Leakage Current () CC > TH, not asserted 0.5 µa Note 1: All parts are production tested at T A = +25 C. Overtemperature limits are guaranteed by design and not production tested. Note 2: I SOURCE for the MAX6800 is 100nA. I SINK for the MAX6801 is 100nA. I SINK for the is 50μA. TH TH TH + 1.8% TH + 3% Reset Active Timeout Period t RP CC Falling Reset Delay CC falling at 10/ms 30 µs MAX680_UR D2-T ms MAX680_UR D1-T MAX680_UR D3-T I SINK = 50µA, CC Output Low-oltage Reset (MAX6801/) OL I asserted SINK = 1.2mA, CC I SINK = 1.2mA, CC Output High-oltage (MAX6801) Output oltage (MAX6800) OH OH OL Reset not asserted Reset asserted Reset not asserted I SOURCE = 500µA, CC x CC I SOURCE = 800µA, CC x CC I SOURCE = 1µA, CC x CC I SOURCE = 200µA, CC x CC I SOURCE = 800µA, CC x CC I SINK = 1.2mA, CC I SINK = 3.2mA, CC Maxim Integrated 2
3 Typical Operating Characteristics (Reset not asserted, T A = +25 C, unless otherwise noted.) ICC (µa) OUTPUT OLTAGE HIGH (CC - OH) (m) SUPPLY CURRENT vs. TEMPERATURE CC = +5.0 CC = TEMPERATURE ( C) ( OH ) vs. SUPPLY OLTAGE T A = +125 C T A = +85 C T A = -40 C CC () TH = 2.93 I SOURCE = 100A ASSERTED (MAX6800) T A = +25 C MAX6800/01/02 toc01 MAX6800/01/02 toc04 NORMALIZED TIMEOUT PERIOD MAXIMUM TRANSIENT DURATION (µs) NORMALIZED TIMEOUT PERIOD vs. TEMPERATURE TEMPERATURE ( C) MAXIMUM TRANSIENT DURATION vs. COMPARATOR OERDRIE DOES NOT OCCUR OCCURS MAX6800/01/02 toc02 MAX6800/01/02 toc COMPARATOR OERDRIE (m) OUTPUT OLTAGE LOW (m) PROPAGATION DELAY (µs) ( OL ) vs. SUPPLY OLTAGE T A = +125 C T A = +85 C TH = 2.93 I SINK = 500mA ASSERTED MAX6801/ T A = +25 C T A = -40 C CC () CC FALLING PROPAGATION DELAY vs. TEMPERATURE CC = FALLING AT 1/ms CC = FALLING AT 10/ms TEMPERATURE ( C) MAX6800/01/02 toc03 MAX6800/01/02 toc06 Maxim Integrated 3
4 Pin Configuration TOP IEW 1 MAX6800 MAX CC () 2 ( ) ARE FOR MAX6800 SOT23-3 Pin Description MAX6800 PIN MAX6801/ NAME 1 1 Ground CC Supply oltage Input FUNCTION Active-Low Reset Output. is asserted while CC is below the reset threshold and remains asserted for a reset timeout period (t RP ) after CC rises above the reset threshold. on the MAX6801 is push/pull. on the is open-drain. Active-High Reset Output. is asserted while CC is below the reset threshold and remains asserted for a reset timeout period (t RP ) after CC rises above the reset threshold. on the MAX6800 is push/pull. Maxim Integrated 4
5 Applications Information Interfacing to μps with Bidirectional Reset Pins Since the output on the is opendrain, this device interfaces easily with μps that have bidirectional reset pins, such as the Motorola 68HC11. Connecting the μp supervisor s output directly to the microcontroller s (μc s) pin with a single pullup resistor allows either device to assert reset (Figure 1). Negative-Going CC Transients In addition to issuing a reset to the μp during power-up, power-down, and brownout conditions, these devices are relatively immune to short-duration, negativegoing CC transients (glitches). The Typical Operating Characteristics show the Maximum Transient Duration vs. Reset Comparator Overdrive graph. The graph shows the maximum pulse width that a negative-going CC transient may typically have without issuing a reset signal. As the amplitude of the transient increases, the maximum allowable pulse width decreases. Ensuring a alid Reset Output Down to CC = 0 When CC falls below 1 and approaches the minimum operating voltage of 0.7, push/pull-structured reset sinking (or sourcing) capabilities decrease drastically. High-impedance CMOS-logic inputs connected to the pin can drift to indeterminate voltages. This does not present a problem in most cases, since most μps and circuitry do not operate when CC drops below 1. For the MAX6801 application, where must be valid down to 0, adding a pulldown resistor between and removes stray leakage currents, holding low (Figure 2a). The pulldown resistor value is not critical; 100kΩ is large enough not to load and small enough to pull it low. For the MAX6800 application, where must be valid to CC = 0, a 100kΩ pullup resistor between and CC will hold high when CC falls below 0.7 (Figure 2b). Since the has an open-drain, active-low output, it typically uses a pullup resistor. With this device, will most likely not maintain an active condition, but will drift to a non-active level due to the pullup resistor and the reduced sinking capability of the open-drain device. Therefore, this device is not recommended for applications where the pin is required to be valid down to CC = 0. CC CC CC CC 100kΩ CC µp MOTOROLA 68HCXX MAX kΩ MAX kΩ* (a) (b) *ASSUMES HIGH-Z INPUT TO THE µp Figure 1. Interfacing to μps with Bidirectional Reset Pins Figure 2. Ensuring Reset alid Down to CC = 0 Maxim Integrated 5
6 Table 1. Factory-Trimmed Reset Thresholds THRESHOLD SUFFIX T A = +25 C T A = -40 C to +125 C MIN TYP ( TH ) MAX MIN MAX Maxim Integrated 6
7 Selector Guide (Standard ersions*) PART OUTPUT STAGE NOMINAL TH () *Sample stock is generally held on all standard versions. MIN TIMEOUT (ms) SOT TOP MARK MAX6800UR26D3-T Push/Pull FZIE MAX6800UR29D3-T Push/Pull FZIF MAX6800UR31D3-T Push/Pull FZIG MAX6800UR44D3-T Push/Pull FZIH MAX6800UR46D3-T Push/Pull FZII MAX6801UR26D3-T Push/Pull FZIK MAX6801UR29D3-T Push/Pull FZIM MAX6801UR31D3-T Push/Pull FZIN MAX6801UR44D3-T Push/Pull FZIO MAX6801UR46D3-T Push/Pull FZIP UR26D3-T Open-Drain FZIQ UR29D3-T Open-Drain FZIR UR31D3-T Open-Drain FZIS UR44D3-T Open-Drain FZIT UR46D3-T Open-Drain FZIU Ordering Information PART TEMP RANGE PIN-PACKAGE MAX6800UR D_-T -40 C to +125 C 3 SOT23 MAX6801UR D_-T -40 C to +125 C 3 SOT23 UR D_-T -40 C to +125 C 3 SOT23 *These devices are available in factory-set CC reset thresholds from 2.63 to 4.80, in approximately 0.1 increments. Choose the desired reset threshold suffix from Table 1 and insert it in the blanks following UR in the part number. Factory-programmed reset timeout periods are also available. Insert the number corresponding to the desired nominal reset timeout period (1 = 1ms min, 2 = 20ms min, 3 = 100ms min) in the blank following D in the part number. There are 15 standard versions with a required order increment of 2500 pieces. Sample stock is generally held on the standard versions only (see Selector Guide). Contact the factory for availability of nonstandard versions (required order increment is 10,000 pieces). All devices available in tape-and-reel only. Devices are available in both leaded and lead-free packaging. Specify lead-free by replacing -T with +T when ordering. Chip Information PROCESS: BiCMOS Package Information For the latest package outline information and land patterns (footprints), go to 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 SOT23 U Maxim Integrated 7
8 Revision History REISION NUMBER REISION DATE DESCRIPTION PAGES CHANGED 3 10/11 Added automotive-qualified part information to Ordering Information /12 Updated Factory-Trimmed Reset Thresholds table /16 Updated Ordering Information table 1 For pricing, delivery, and ordering information, please contact Maxim Direct at , or visit Maxim Integrated s website at Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated 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. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc Maxim Integrated Products, Inc. 8
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