19-1294; Rev 4; 12/05 3-Pin, Ultra-Low-Power SC70/SOT P Reset Circuits The MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/ MAX6348 microprocessor (P) supervisory circuits monitor the power supplies in P and digital systems. These devices provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with 2.5V, 3V, 3.3V, and 5V powered circuits. These circuits perform a single function: they assert a reset signal whenever the VCC supply voltage declines below a preset threshold, keeping it asserted for at least 100ms after VCC has risen above the reset threshold. The only difference between the devices is their output. The MAX6326/MAX6346 (push-pull) and MAX6328/ MAX6348 (open-drain) have an active-low reset output. The MAX6327/MAX6347 have an active-high push-pull reset output. All of these parts are guaranteed to be in the correct state for VCC down to 1V. The reset comparator is designed to ignore fast transients on VCC. Reset thresholds are factory-trimmable between 2.2V and 4.63V, in approximately 100mV increments. Twenty-one standard versions are available. Contact the factory for availability of nonstandard versions. Ultra-low supply currents (1A max for the MAX6326/ MAX6327/MAX6328) make these parts ideal for use in portable equipment. All six devices are available in space-saving SOT23 and SC70 packages. Applications Computers Intelligent Instruments Controllers Automotive Critical P and C Power Monitoring Portable/Battery-Powered Equipment Pin Configuration TOP VIEW GND 1 MAX6326 MAX6327 MAX6328 MAX6346 MAX6347 MAX6348 (RESET) RESET 3 VCC Features Ultra-Low 1A (max) Supply Current (MAX6326/MAX6327/MAX6328) Precision Monitoring of 2.5V, 3V, 3.3V, and 5V Power-Supply Voltages Reset Thresholds Available from 2.2V to 4.63V Fully Specified Over Temperature 100ms (min) Power-On Reset Pulse Width Low Cost Available in Three Versions: Push-Pull RESET, Push-Pull RESET, and Open-Drain RESET Power-Supply Transient Immunity No External Components 3-Pin SC70/SOT23 Packages Pin Compatible with MAX803/MAX809/MAX810 Ordering Information PART TEMP. RANGE PIN-PACKAGE MAX6326XR_ _-T -40C to +85C 3 SC70-3 MAX6326UR_ _-T -40C to +85C 3 SOT23-3 MAX6327XR_ _-T -40C to +85C 3 SC70-3 MAX6327UR_ _-T MAX6328XR_ _-T MAX6328UR_ _-T MAX6346XR_ _-T -40C to +85C -40C to +85C -40C to +85C -40C to +85C 3 SOT23-3 3 SC70-3 3 SOT23-3 3 SC70-3 MAX6346UR_ _-T -40C to +85C 3 SOT23-3 MAX6347XR_ _-T -40C to +85C 3 SC70-3 MAX6347UR_ _-T MAX6348XR_ _-T MAX6348UR_ _-T -40C to +85C -40C to +85C -40C to +85C 3 SOT23-3 3 SC70-3 3 SOT23-3 The MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/ MAX6348 are available in factory-set VCC reset thresholds from 2.2V to 4.63V, in approximately 0.1V increments. Choose the desired reset-threshold suffix from Table 1 and insert it in the blank spaces following "R." There are 21 standard versions with a required order increment of 2500 pieces. Sample stock is generally held on the standard versions only (see the Selector Guide). Required order increment is 10,000 pieces for nonstandard versions (Table 2). Contact factory for availability. 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. 2 SOT23-3/SC70-3 Selector Guide appears at end of data sheet. ( ) ARE FOR THE MAX6327/MAX6347. ________________________________________________________________ Maxim Integrated Products 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. 1 MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348 General Description MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348 3-Pin, Ultra-Low-Power SC70/SOT P Reset Circuits ABSOLUTE MAXIMUM RATINGS Terminal Voltage (with respect to GND) VCC ...........................................................................-0.3V to +6V RESET, RESET (push-pull) .........................-0.3V to (VCC + 0.3V) RESET (open drain)..................................................-0.3V to +6V Input Current (VCC) .............................................................20mA Output Current (RESET, RESET).........................................20mA Rate of Rise (VCC) ...........................................................100V/s Continuous Power Dissipation (TA = +70C) 3-Pin SC70 (derate 2.7mW/C above +70C) ...............174mW 3-Pin SOT23 (derate 4mW/C above +70C)................320mW Operating Temperature Range ...........................-40C to +85C 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 +85C, unless otherwise noted. Typical values are at TA = +25C and VCC = 3V.) (Note 1) PARAMETER SYMBOL VCC Range Supply Current ICC CONDITIONS MIN Reset Threshold Tempco VTH 5.5 TA = -40C to +85C 1.2 5.5 MAX632_ only, VCC = 3.0V for VTH 2.93V, VCC = 3.2V for VTH > 2.93V, no load 0.5 1.0 1.75 TA = +25C VTH VTH + 1.5% TA = -40C to +85C VTH 2.5% VTH VTH + 2.5% Table 1 VCC = VTH to (VTH - 100mV) Reset Active Timeout Period 100 RESET Output Voltage (MAX6326/MAX6328/ MAX6346/MAX6348) VOL RESET Output Voltage (MAX6326/MAX6346) VOH VOH RESET Output Voltage (MAX6327/MAX6347) VOL V A V ppm/C 20 s 185 280 ISINK = 1.6mA, VCC > 2.1V, reset asserted 0.3 ISINK = 100A, VCC 1.2V, reset asserted 0.4 ms V ISOURCE = 500A, VCC = 3.2V, MAX6326 only 0.8 * VCC ISOURCE = 800A, VCC = 4.5V, VTH 4.38V 0.8 * VCC ISOURCE = 800A, VCC = VTH(MAX), VTH 4.5V 0.8 * VCC ISOURCE = 500A, VCC 2.1V, reset asserted 0.8 * VCC ISOURCE = 50A, VCC 1.2V, reset asserted 0.8 * VCC V ISINK = 1.2mA, VCC 3.2V, reset not asserted, MAX6327 only 0.3 ISINK = 3.2mA, VCC 4.5V, reset not asserted, VTH 4.38V 0.4 V 0.4 MAX6326/MAX6327/MAX6328 6.3 MAX6346/MAX6347/MAX6348 9.5 Open-Drain RESET Output Leakage Current Note 1: Overtemperature limits are guaranteed by design and not production tested. 2 UNITS 40 ISINK = 3.2mA, VCC = VTH(MAX), VTH 4.5V RESET Threshold Hysteresis 1.0 VTH 1.5% VTH/C VCC to Reset Delay MAX 1.0 VCC = 5.5V, no load Reset Threshold TYP TA = 0C to +70C _______________________________________________________________________________________ mV 0.1 A 3-Pin, Ultra-Low-Power SC70/SOT P Reset Circuits POWER-DOWN RESET DELAY vs. TEMPERATURE MAX6326-01 1.0 0.9 MAX6326-02 SUPPLY CURRENT vs. TEMPERATURE 200 VCC = 5V 0.7 RESET DELAY (s) 0.6 VCC = 3.3V 0.5 0.4 100 VOD = 20mV VOD = 10mV 0.3 50 0.2 0.1 VOD = 100mV VCC = 1.2V VOD = 200mV 0 0 -20 0 20 40 60 -40 80 -20 0 20 40 60 80 TEMPERATURE (C) TEMPERATURE (C) POWER-UP RESET TIMEOUT vs. TEMPERATURE MAXIMUM TRANSIENT DURATION vs. RESET THRESHOLD OVERDRIVE (SC70) MAX6326-03 210 200 190 180 170 160 150 140 500 MAXIMUM TRANSIENT DURATION (s) -40 POWER-UP RESET TIMEOUT (ms) 150 MAX6326-04 SUPPLY CURRENT (A) 0.8 400 300 200 100 0 130 -40 -20 0 20 40 60 1 80 TEMPERATURE (C) 10 100 1000 RESET THRESHOLD OVERDRIVE, VTH - VCC (mV) ______________________________________________________________Pin Description PIN PIN MAX6326/MAX6346 MAX6328/MAX6348 MAX6327 MAX6347 NAME 1 1 GND FUNCTION Ground 2 -- RESET Active-Low Reset Output. RESET remains low while VCC is below the reset threshold and for at least 100ms after VCC rises above the reset threshold. RESET is open-drain on the MAX6328/MAX6348 and push-pull on the MAX6326/MAX6346. -- 2 RESET Active-High Reset Output. RESET remains high while VCC is below the reset threshold and for at least 100ms after VCC rises above the reset threshold. 3 3 VCC Supply Voltage _______________________________________________________________________________________ 3 MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348 __________________________________________Typical Operating Characteristics (TA = +25C, unless otherwise noted.) MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348 3-Pin, Ultra-Low-Power SC70/SOT P Reset Circuits ____________ Applications Information Interfacing to Ps with Bidirectional Reset Pins Since the RESET output on the MAX6328/MAX6348 is open drain, these devices interface easily with microprocessors (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 pull-up resistor allows either device to assert reset (Figure 1). VCC VCC MAX6328 MAX6348 VCC P MOTOROLA RESET 68HCXX INPUT RESET 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 Threshold Overdrive graph, for which reset pulses are not generated. The graph shows the maximum pulse width that a negativegoing VCC transient may typically have when issuing a reset signal. As the amplitude of the transient increases, the maximum allowable pulse width decreases. GND GND Figure 1. Interfacing to Ps with Bidirectional Reset Pins Table 1. Factory-Trimmed Reset Thresholds RESET THRESHOLD VOLTAGE, VTH (V) PART SUFFIX TA = +25C TA = -40C to +85C MIN TYP MAX MIN MAX MAX632_ _R 22 2.167 2.200 2.233 2.145 2.250 MAX632_ _R 23 2.285 2.320 2.355 2.262 2.375 MAX632_ _R 24 2.364 2.400 2.436 2.340 2.460 MAX632_ _R 25 2.462 2.500 2.537 2.437 2.562 MAX632_ _R 26 2.591 2.630 2.669 2.564 2.696 MAX632_ _R 27 2.660 2.700 2.741 2.633 2.768 MAX632_ _R 28 2.758 2.800 2.842 2.730 2.870 MAX632_ _R 29 2.886 2.930 2.974 2.857 3.000 MAX632_ _R 30 2.955 3.000 3.045 2.925 3.075 MAX632_ _R 31 3.034 3.080 3.126 3.003 3.150 MAX634_ _R 33 3.250 3.300 3.350 3.217 3.383 MAX634_ _R 34 3.349 3.400 3.451 3.315 3.485 MAX634_ _R 35 3.447 3.500 3.552 3.412 3.587 MAX634_ _R 36 3.546 3.600 3.654 3.510 3.690 MAX634_ _R 37 3.644 3.700 3.755 3.607 3.792 MAX634_ _R 38 3.743 3.800 3.857 3.705 3.895 Factory-trimmed reset thresholds are available in approximately 100mV increments with a 1.5% room-temperature variance. 4 _______________________________________________________________________________________ 3-Pin, Ultra-Low-Power SC70/SOT P Reset Circuits RESET THRESHOLD VOLTAGE, VTH (V) PART SUFFIX TA = +25C TA = -40C to +85C MIN TYP MAX MIN MAX MAX634_ _R 39 3.841 3.900 3.958 3.802 3.997 MAX634_ _R 40 3.940 4.000 4.060 3.900 4.100 MAX634_ _R 41 4.038 4.100 4.161 3.997 4.202 MAX634_ _R 42 4.137 4.200 4.263 4.095 4.305 MAX634_ _R 43 4.235 4.300 4.364 4.192 4.407 MAX634_ _R 44 4.314 4.380 4.446 4.270 4.489 MAX634_ _R 45 4.432 4.500 4.567 4.387 4.612 MAX634_ _R 46 4.560 4.630 4.699 4.514 4.746 Factory-trimmed reset thresholds are available in approximately 100mV increments with a 1.5% room-temperature variance. Table 2. Device Marking Codes and Minimum Order Increments SOT23 SC70 ORDER INCREMENT (k) FZBI ACO 2.5 MAX6347_R46-T TOP MARK PART MAX6346_R46-T SOT23 SC70 ORDER INCREMENT (k) FZBW ACF 2.5 TOP MARK PART MAX6346_R45-T FZBH - 10 MAX6347_R45-T FZBV - 10 MAX6346_R44-T FZBG ACK 2.5 MAX6347_R44-T FZBU ACL 2.5 MAX6346_R43-T FZBF - 10 MAX6347_R43-T FZBT - 10 MAX6346_R42-T FZBE - 10 MAX6347_R42-T FZBS - 10 MAX6346_R41-T FZBD - 10 MAX6347_R41-T FZBR - 10 MAX6346_R40-T FZBC - 10 MAX6347_R40-T FZBQ - 10 MAX6346_R39-T FZBB - 10 MAX6347_R39-T FZBP - 10 MAX6346_R38-T FZBA - 10 MAX6347_R38-T FZBO - 10 MAX6346_R37-T FZAZ - 10 MAX6347_R37-T FZBN - 10 MAX6346_R36-T FZAY - 10 MAX6347_R36-T FZBM - 10 MAX6346_R35-T FZAX - 10 MAX6347_R35-T FZBL - 10 MAX6346_R34-T FZAW - 10 MAX6347_R34-T FZBK - 10 MAX6346_R33-T FZAV - 10 MAX6347_R33-T FZBJ - 10 MAX6326_R31-T FDAA ACE 2.5 MAX6327_R31-T FMAA ACT 2.5 MAX6326_R30-T FEAA - 10 MAX6327_R30-T FNAA - 10 MAX6326_R29-T FCAA ACP 2.5 MAX6327_R29-T FLAA ACS 2.5 MAX6326_R28-T FBAA - 10 MAX6327_R28-T FKAA - 10 MAX6326_R27-T FAAA - 10 MAX6327_R27-T FJAA - 10 MAX6326_R26-T EZAA ACI 2.5 MAX6327_R26-T FIAA ACR 2.5 MAX6326_R25-T EYAA - 10 MAX6327_R25-T FHAA - 10 MAX6326_R24-T EXAA - 10 MAX6327_R24-T FGAA - 10 MAX6326_R23-T EWAA ACH 2.5 MAX6327_R23-T FFAA ACQ 2.5 MAX6326_R22-T EHAA AAH 2.5 MAX6327_R22-T EIAA AAI 2.5 _______________________________________________________________________________________ 5 MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348 Table 1. Factory-Trimmed Reset Thresholds (continued) MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348 3-Pin, Ultra-Low-Power SC70/SOT P Reset Circuits Table 2. Device Marking Codes and Minimum Order Increments (continued) SOT23 SC70 ORDER INCREMENT (k) SOT23 SC70 ORDER INCREMENT (k) MAX6348_R46-T FZCK ACN 2.5 MAX6348_R45-T FZCJ - 10 MAX6348_R34-T FZBY - 10 MAX6348_R33-T FZBX - 10 MAX6348_R44-T FZCI ACM 2.5 MAX6348_R43-T FZCH - 10 MAX6328_R31-T FVAA ACW 2.5 MAX6328_R30-T FWAA - MAX6348_R42-T FZCG - 10 10 MAX6328_R29-T FUAA ACV 2.5 MAX6348_R41-T FZCF - 10 MAX6328_R28-T FTAA - 10 MAX6348_R40-T MAX6348_R39-T FZCE - 10 MAX6328_R27-T FSAA - 10 FZCD - 10 MAX6328_R26-T FRAA ACJ 2.5 MAX6348_R38-T MAX6348_R37-T FZCC - 10 MAX6328_R25-T FQAA - 10 FZCB - 10 MAX6328_R24-T FPAA - 10 MAX6348_R36-T FZCA - 10 MAX6328_R23-T FOAA ACU 2.5 MAX6348_R35-T FZBZ - 10 MAX6328_R22-T EJAA AAJ 2.5 TOP MARK PART Selector Guide (standard versions*) PART TOP MARK PART ___________________Chip Information TRANSISTOR COUNT: 419 NOMINAL VTH (V) MAX634_ _R46-T 4.63 MAX634_ _R44-T 4.38 MAX632_ _R31-T 3.08 MAX632_ _R29-T 2.93 MAX632_ _R26-T 2.63 MAX632_ _R23-T 2.32 MAX632_ _R22-T 2.20 *Sample stock is generally held on all standard versions. 6 _______________________________________________________________________________________ 3-Pin, Ultra-Low-Power SC70/SOT P Reset Circuits SOTPO3L.EPS _______________________________________________________________________________________ 7 MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348 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.) 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.) SC70, 3L.EPS MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348 3-Pin, Ultra-Low-Power SC70/SOT P Reset Circuits PACKAGE OUTLINE, 3L SC70 21-0075 C 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. 8 _____________________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.