MAX6803/MAX6804/ MAX6805 4-Pin, Low-Power P Reset Circuits with Manual Reset General Description Features The MAX6803/MAX6804/MAX6805 microprocessor (P) supervisory circuits monitor the power supplies in 2.85V to 5.0V P and digital systems. They increase circuit reliability and reduce cost by eliminating external components and adjustments. They also feature a debounced manual-reset input. These devices perform a single function: they assert a reset signal whenever the VCC supply voltage declines below a preset threshold or whenever manual reset is asserted. Reset remains asserted for a preset timeout period after VCC has risen above the reset threshold or after manual reset is deasserted. The only difference among the three devices is their output. The MAX6804 (push/pull) and MAX6805 (open-drain) have an activelow RESET output, while the MAX6803 (push/pull) has an active-high RESET output. The MAX6803/MAX6804 are guaranteed to be in the correct state for VCC down to 0.7V. The MAX6805 is guaranteed to be in the correct state for VCC down to 1.0V. The reset comparator in these ICs is designed to ignore fast transients on VCC. Reset thresholds are factorytrimmable between 2.63V and 4.80V, in approximately 100mV increments. These devices are available with a 1ms min, 20ms min, or 100ms min reset timeout period. Ideal for space-critical applications, the MAX6803/ MAX6804/MAX6805 come packaged in a 4-pin SOT143. For a lower threshold voltage version, see the MAX6335/ MAX6336/MAX6337. Applications Computers Controllers Intelligent Instruments Critical P/C Power Monitoring Portable/Battery-Powered Equipment Typical Operating Circuit and Pin Configuration appear at end of data sheet. Selector Guide appears at end of data sheet. 19-1946; Rev 3; 7/14 Ultra-Low 0.7V Operating Supply Voltage Low 4.0A Supply Current Precision Monitoring of 2.85V to 5.0V Power-Supply Voltages Reset Thresholds Available from 2.63V to 4.80V, in Approximately 100mV Increments Debounced Manual-Reset Input 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 RESET, Push/Pull RESET, Open-Drain RESET Guaranteed RESET/RESET Valid to VCC = 0.7V (MAX6803/MAX6804) Power-Supply Transient Immunity No External Components Required 4-Pin SOT143 Package Pin Compatible with MAX811/MAX812 and MAX6314/MAX6315( Ordering Information PART* TEMP RANGE PIN-PACKAGE MAX6803US_ _D_-T -40C to +125C 4 SOT143 MAX6804US_ _D_-T -40C to +125C 4 SOT143 MAX6805US_ _D_-T -40C to +125C 4 SOT143 *These devices are available in factory-set VCC reset thresholds from 2.63V to 4.80V, in approximately 0.1V increments. Choose the desired reset threshold suffix from Table 1 and insert it in the blanks following "US" 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. MAX6803/MAX6804/ MAX6805 4-Pin, Low-Power P Reset Circuits with Manual Reset Absolute Maximum Ratings Terminal Voltage (with respect to GND) VCC.......................................................................-0.3V to +6V Push/Pull RESET or RESET, MR......... -0.3V to (VCC + 0.3V) Open-Drain RESET..............................................-0.3V to +6V Input Current (VCC).............................................................20mA Output Current (RESET, RESET).......................................20mA Continuous Power Dissipation (TA = +70C) 4-Pin SOT143 (derate 4mW/C above +70C)............320mW Operating Temperature Range.......................... -40C to +125C 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 (VCC = full range, TA = -40C to +125C, unless otherwise noted. Typical values are at VCC = +5.0V and TA = +25C, reset not asserted.) (Note 1) PARAMETER Supply Voltage Range (Note 1) Supply Current Reset Threshold SYMBOL TA = 0C to +125C VCC TA = -40C to +125C MIN MAX 0.7 5.5 MAX6805 1.0 5.5 MAX6803/MAX6804 0.78 5.5 MAX6805 1.2 5.5 4 10 VCC = +5.0V 5 12 VTH - 1.8% VTH VTH + 1.8% VTH - 3% VTH VTH + 3% MAX680_US_ _D1-T 1 1.5 2 MAX680_US_ _D2-T 20 30 40 MAX680_US_ _D3-T 100 150 200 No load VTH MAX680_US_ _D_-T, Table 1 TA = +25C TA = -40C to +125C VCC falling at 10V/ms tRP TYP MAX6803/MAX6804 VCC = +3.0V ICC VCC Falling Reset Delay Reset Active Timeout Period CONDITIONS MR Minimum Pulse Width 30 UNITS V A V s 1 ms s MR Glitch Immunity 50 ns MR Reset Delay 0.1 s MR Input Voltage 0.3 x VCC VIL 0.7 x VCC VIH MR Pullup Resistance 12 RESET Output Low Voltage (MAX6804/MAX6805) VOL RESET Output High Voltage (MAX6804) VOH www.maximintegrated.com Reset asserted Reset not asserted 20 30 ISINK = 50A, VCC 1.0V 0.4 ISINK = 1.2mA, VCC 2.5V 0.3 ISINK = 3.2mA, VCC 4.25V 0.4 ISOURCE = 500A, VCC 3.0V 0.8 x VCC ISOURCE = 800A, VCC 5.0V 0.8 x VCC V kW V V Maxim Integrated 2 MAX6803/MAX6804/ MAX6805 4-Pin, Low-Power P Reset Circuits with Manual Reset Electrical Characteristics (continued) (VCC = full range, TA = -40C to +125C, unless otherwise noted. Typical values are at VCC = +5.0V and TA = +25C, reset not asserted.) (Note 1) PARAMETER SYMBOL CONDITIONS Reset asserted VOH RESET Output Voltage (MAX6803) ISOURCE = 200A, VCC 1.8V RESET Output Leakage Current (MAX6805) TYP MAX UNITS V ISOURCE = 800A, VCC 4.25V 0.8 x VCC Reset not asserted VOL MIN 0.8 x VCC 0.8 x VCC ISOURCE = 1A, VCC 1.0V ISINK = 1.2mA, VCC 3.0V 0.3 ISINK = 3.2mA, VCC 5.0V 0.4 VCC > VTH, RESET not asserted V 0.5 A Note 1: All parts are production tested at TA = +25C. Over temperature limits are guaranteed by design and not production tested. Note 2: ISOURCE for the MAX6803 is 100nA; ISINK for the MAX6804 is 100nA; ISINK for the MAX6805 is 50A. Typical Operating Characteristics (Reset not asserted, TA = +25C, unless otherwise noted.) 4.0 VCC = +3.3V 3.5 3.0 -50 -25 0 25 50 75 100 125 1.020 1.010 1.000 0.990 0.980 0.970 0.950 25 +25C -40C 1.0 1.5 2.0 VCC (V) www.maximintegrated.com 2.5 3.0 -50 -25 0 25 50 75 100 +85C +25C 40 -40C 20 0 125 1.0 1.5 MAXIMUM TRANSIENT DURATION vs. RESET COMPARATOR OVERDRIVE 500 RESET OCCURS 200 RESET DOES NOT OCCUR 100 0 0.1 1 100 90 80 70 VCC = FALLING AT 1V/ms 60 50 40 30 20 VCC = FALLING AT 10V/ms 10 10 3.0 VCC FALLING PROPAGATION DELAY vs. TEMPERATURE 400 300 2.5 2.0 VCC (V) MAX6803/04/05 toc05 600 MAXIMUM TRANSIENT DURATION (s) +125C +85C 0 MAX6803/04/05 toc04 OUTPUT-VOLTAGE HIGH (VCC - VOH) (mV) VTH = 2.93V ISINK = 100A RESET ASSERTED (MAX6803) 50 +125C TEMPERATURE (C) OUTPUT-VOLTAGE HIGH vs. SUPPLY VOLTAGE 75 60 0.960 TEMPERATURE (C) 100 VTH = 2.93V ISINK = 500A RESET 100 1000 RESET COMPARATOR OVERDRIVE (mV) MAX6803/04/05 toc06 4.5 1.030 80 OUTPUT-VOLTAGE LOW (mV) 5.0 1.040 POROPAGATION DELAY (s) ICC (A) VCC = +5.0V MAX6803/04/05 toc02 6.0 1.050 NORMALIZED RESET TIMEOUT PERIOD MAX6803/04/05 toc01 6.5 5.5 OUTPUT-VOLTAGE LOW vs. SUPPLY VOLTAGE NORMALIZED RESET TIMEOUT PERIOD vs. TEMPERATURE MAX6803/04/05 toc03 SUPPLY CURRENT vs. TEMPERATURE 0 -50 -25 0 25 50 75 100 125 TEMPERATURE (C) Maxim Integrated 3 MAX6803/MAX6804/ MAX6805 4-Pin, Low-Power P Reset Circuits with Manual Reset Pin Description PIN MAX6803 MAX6804 NAME FUNCTION MAX6805 1 1 GND Ground -- 2 RESET Active-Low Reset Output. RESET is asserted while VCC is below the reset threshold, or while MR is asserted. RESET remains asserted for a reset timeout period (tRP) after VCC rises above the reset threshold or MR is deasserted. RESET on the MAX6804 is push/pull. RESET on the MAX6805 is open-drain. 2 -- RESET Active-High Reset Output. RESET is asserted high while VCC is below the reset threshold or while MR is asserted, and RESET remains asserted for a reset timeout period (tRP) after VCC rises above the reset threshold or MR is deasserted. RESET on the MAX6803 is push/pull. 3 3 MR Manual-Reset Input. A logic low on MR asserts reset. Reset remains asserted as long as MR is low, and for the reset timeout period (tRP) after MR goes high. Leave unconnected or connect to VCC if not used. 4 4 VCC Supply Voltage Input Applications Information Manual-Reset Input Many P-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 after MR returns high. MR has an internal 20k pullup resistor, so it can be left unconnected if not used. Connect a normally open momentary switch from MR to GND to create a manual-reset function; external debounce circuitry is not required. Interfacing to Ps with Bidirectional Reset Pins Since the RESET output on the MAX6805 is open-drain, this device interfaces easily with Ps that have bidirectional reset pins, such as the Motorola 68HC11. Connecting the P supervisor's RESET output directly to the microcontroller's (C's) RESET pin with a single pullup resistor allows either device to assert reset (Figure 1). Negative-Going VCC Transients In addition to issuing a reset to the P during power-up, power-down, and brownout conditions, these devices are relatively immune to short-duration, negative-going VCC transients (glitches). The Typical Operating Characteristics show the Maximum Transient Duration vs. Reset Comparator Overdrive graph. The graph www.maximintegrated.com shows the maximum pulse width that a negative-going VCC transient may typically have without issuing a reset signal. As the amplitude of the transient increases, the maximum allowable pulse width decreases. Ensuring a Valid Reset Output Down to VCC = 0 When VCC falls below 1V and approaches the minimum operating voltage of 0.7V, push/pull-structured reset sinking (or sourcing) capabilities decrease drastically. High-impedance CMOS-logic inputs connected to the RESET pin can drift to indeterminate voltages. This does not present a problem in most cases, since most VCC 100k VCC MAX6805 MR RESET GND VCC P MOTOROLA 68HCXX RESET GND Figure 1. Interfacing to Ps with Bidirectional Reset Pins Maxim Integrated 4 MAX6803/MAX6804/ MAX6805 4-Pin, Low-Power P Reset Circuits with Manual Reset Ps and circuitry do not operate when VCC drops below 1V. For the MAX6804 application where RESET must be valid down to 0, adding a pulldown resistor between RESET and GND removes stray leakage currents, holding RESET low (Figure 2a). The pulldown resistor value is not critical; 100k is large enough not to load RESET, and small enough to pull it low. For the MAX6803, where RESET must be valid to VCC = 0, a 100k pullup resistor between RESET and VCC will hold RESET high when VCC falls below 0.7V (Figure 2b). Pin Configuration VCC TOP VIEW MAX6804 MR RESET GND 1 100k GND (a) Since the MAX6805 has an open-drain, active-low out-put, it typically uses a pullup resistor. With this device, RESET 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 opendrain device. Therefore, this device is not recommended for applications where the RESET pin is required to be valid down to VCC = 0. 4 VCC 3 MR MAX6803 MAX6804 MAX6805 VCC RESET (RESET) MAX6803 (b) 100k* RESET MR 2 ( ) ARE FOR MAX6803 SOT143 GND *ASSUMES HIGH-Z RESET INPUT TO THE P Figure 2. Ensuring Reset Valid down to VCC = 0 Typical Operating Circuit VCC VCC VCC MAX6804 P MR RESET GND RESET GND PUSHBUTTON SWITCH www.maximintegrated.com Maxim Integrated 5 MAX6803/MAX6804/ MAX6805 4-Pin, Low-Power P Reset Circuits with Manual Reset Table 1. Factory-Trimmed Reset Thresholds RESET THRESHOLD SUFFIX MIN TYP (VTH) MAX MIN MAX 48 4.714 4.80 4.886 4.656 4.944 47 4.615 4.70 4.785 4.559 4.841 46 4.547 4.63 4.713 4.491 4.769 45 4.419 4.50 4.581 4.365 4.635 44 4.301 4.38 4.459 4.249 4.511 43 4.223 4.30 4.377 4.171 4.429 42 4.124 4.20 4.276 4.074 4.326 41 4.026 4.10 4.174 3.977 4.223 40 3.928 4.00 4.072 3.880 4.120 39 4.830 3.90 3.970 3.783 4.017 38 3.732 3.80 3.868 3.686 3.914 37 3.633 3.70 3.767 3.589 3.811 36 3.535 3.60 3.665 3.492 3.708 35 3.437 3.50 3.563 3.395 3.605 34 3.339 3.40 3.461 3.298 3.502 33 3.241 3.30 3.359 3.201 3.399 32 3.142 3.20 3.258 3.104 3.296 31 3.025 3.08 3.135 2.988 3.172 30 2.946 3.00 3.054 2.910 3.090 29 2.877 2.93 2.983 2.842 3.018 28 2.750 2.80 2.850 2.716 2.884 27 2.651 2.70 2.749 2.619 2.781 26 2.583 2.63 2.677 2.551 2.709 www.maximintegrated.com TA = +25C TA = -40C to +125C Maxim Integrated 6 MAX6803/MAX6804/ MAX6805 4-Pin, Low-Power P Reset Circuits with Manual Reset Selector Guide (Standard Versions*) PART OUTPUT STAGE NOMINAL VTH (V) MIN RESET TIMEOUT (ms) SOT TOP MARK MAX6803US26D3-T Push/Pull RESET 2.63 100 KACH MAX6803US29D3-T Push/Pull RESET 2.93 100 KACI MAX6803US31D3-T Push/Pull RESET 3.08 100 KACJ MAX6803US44D3-T Push/Pull RESET 4.38 100 KACK MAX6803US46D3-T Push/Pull RESET 4.63 100 KACL MAX6804US26D3-T Push/Pull RESET 2.63 100 KACN MAX6804US29D3-T Push/Pull RESET 2.93 100 KACP MAX6804US31D3-T Push/Pull RESET 3.08 100 KACQ MAX6804US44D3-T Push/Pull RESET 4.38 100 KACR MAX6804US46D3-T Push/Pull RESET 4.63 100 KACS MAX6805US26D3-T Open-Drain RESET 2.63 100 KACO MAX6805US29D3-T Open-Drain RESET 2.93 100 KACU MAX6805US31D3-T Open-Drain RESET 3.08 100 KACV MAX6805US44D3-T Open-Drain RESET 4.38 100 KACW MAX6805US46D3-T Open-Drain RESET 4.63 100 KACX *Sample stock is generally held on all standard versions. Chip Information TRANSISTOR COUNT: 505 PROCESS: BiCMOS www.maximintegrated.com Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.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. 4 SOT143 U4-1 21-0052 90-0183 Maxim Integrated 7 MAX6803/MAX6804/ MAX6805 4-Pin, Low-Power P Reset Circuits with Manual Reset Revision History REVISION NUMBER REVISION DATE 3 7/14 PAGES CHANGED DESCRIPTION No /V OPNs; removed Automotive reference from Applications section 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated's website at www.maximintegrated.com. 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. (c) 2014 Maxim Integrated Products, Inc. 8 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Maxim Integrated: MAX6803US26D1+T MAX6803US26D2+T MAX6803US26D3+T MAX6803US27D1+T MAX6803US27D2+T MAX6803US27D3+T MAX6803US28D1+T MAX6803US28D2+T MAX6803US28D3+T MAX6803US29D1+T MAX6803US29D2+T MAX6803US29D3+T MAX6803US30D1+T MAX6803US30D2+T MAX6803US30D3+T MAX6803US31D1+T MAX6803US31D2+T MAX6803US31D3+T MAX6803US32D1+T MAX6803US32D2+T MAX6803US32D3+T MAX6803US33D1+T MAX6803US33D2+T MAX6803US33D3+T MAX6803US34D1+T MAX6803US34D2+T MAX6803US34D3+T MAX6803US35D1+T MAX6803US35D2+T MAX6803US35D3+T MAX6803US36D1+T MAX6803US36D2+T MAX6803US36D3+T MAX6803US37D1+T MAX6803US37D2+T MAX6803US37D3+T MAX6803US38D1+T MAX6803US38D2+T MAX6803US38D3+T MAX6803US39D1+T MAX6803US39D2+T MAX6803US39D3+T MAX6803US40D1+T MAX6803US40D2+T MAX6803US40D3+T MAX6803US41D1+T MAX6803US41D2+T MAX6803US41D3+T MAX6803US42D1+T MAX6803US42D2+T MAX6803US42D3+T MAX6803US43D1+T MAX6803US43D2+T MAX6803US43D3+T MAX6803US44D1+T MAX6803US44D2+T MAX6803US44D3+T MAX6803US45D1+T MAX6803US45D2+T MAX6803US45D3+T MAX6803US46D1+T MAX6803US46D2+T MAX6803US46D3+T MAX6803US47D1+T MAX6803US47D2+T MAX6803US47D3+T MAX6803US48D1+T MAX6803US48D2+T MAX6803US48D3+T MAX6804US26D1+T MAX6804US26D2+T MAX6804US26D3+T MAX6804US27D1+T MAX6804US27D2+T MAX6804US27D3+T MAX6804US28D1+T MAX6804US28D2+T MAX6804US28D3+T MAX6804US29D1+T MAX6804US29D2+T MAX6804US29D3+T MAX6804US30D1+T MAX6804US30D2+T MAX6804US30D3+T MAX6804US31D1+T MAX6804US31D2+T MAX6804US31D3+T MAX6804US32D1+T MAX6804US32D2+T MAX6804US32D3+T MAX6804US33D1+T MAX6804US33D2+T MAX6804US33D3+T MAX6804US34D1+T MAX6804US34D2+T MAX6804US34D3+T MAX6804US35D1+T MAX6804US35D2+T MAX6804US35D3+T MAX6804US36D1+T