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19-1294; Rev 3; 1/00
3-Pin, Ultra-Low-Power SC70/SOT P Reset Circuits
General Description
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.
Features
o Ultra-Low 1A (max) Supply Current (MAX6326/MAX6327/MAX6328) o Precision Monitoring of 2.5V, 3V, 3.3V, and 5V Power-Supply Voltages o Reset Thresholds Available from 2.2V to 4.63V o Fully Specified Over Temperature o 100ms (min) Power-On Reset Pulse Width o Low Cost o Available in Three Versions: Push-Pull RESET, Push-Pull RESET, and Open-Drain RESET o o o o Power-Supply Transient Immunity No External Components 3-Pin SC70/SOT23 Packages Pin Compatible with MAX803/MAX809/MAX810
MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348
Ordering Information
PART MAX6326XR_ _-T MAX6326UR_ _-T MAX6327XR_ _-T MAX6327UR_ _-T MAX6328XR_ _-T MAX6328UR_ _-T MAX6346XR_ _-T MAX6346UR_ _-T MAX6347XR_ _-T MAX6347UR_ _-T MAX6348XR_ _-T MAX6348UR_ _-T TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 3 SC70-3 3 SOT23-3 3 SC70-3 3 SOT23-3 3 SC70-3 3 SOT23-3 3 SC70-3 3 SOT23-3 3 SC70-3 3 SOT23-3 3 SC70-3 3 SOT23-3
Applications
Computers Controllers Critical P and C Power Monitoring Intelligent Instruments Automotive Portable/Battery-Powered Equipment
Pin Configuration
TOP VIEW
GND 1
MAX6326 MAX6327 MAX6328 MAX6346 MAX6347 MAX6348
(RESET) RESET 2
3
VCC
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. Selector Guide appears at end of data sheet.
SOT23-3/SC70-3
( ) ARE FOR THE MAX6327/MAX6347.
________________________________________________________________ Maxim Integrated Products
1
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.
3-Pin, Ultra-Low-Power SC70/SOT P Reset Circuits MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348
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 VCC Range SYMBOL CONDITIONS TA = 0C to +70C TA = -40C to +85C ICC MAX632_ only, VCC = 3.0V for VTH 2.93V, VCC = 3.2V for VTH > 2.93V, no load VCC = 5.5V, no load TA = +25C Reset Threshold VTH Table 1 TA = -40C to +85C Reset Threshold Tempco VCC to Reset Delay Reset Active Timeout Period RESET Output Voltage (MAX6326/MAX6328/ MAX6346/MAX6348) RESET Output Voltage (MAX6326/MAX6346) ISINK = 1.6mA, VCC > 2.1V, reset asserted VOL ISINK = 100A, VCC 1.2V, reset asserted ISOURCE = 500A, VCC = 3.2V, MAX6326 only VOH ISOURCE = 800A, VCC = 4.5V, VTH 4.38V ISOURCE = 800A, VCC = VTH(MAX), VTH 4.5V VOH RESET Output Voltage (MAX6327/MAX6347) VOL ISOURCE = 500A, VCC 2.1V, reset asserted ISOURCE = 50A, VCC 1.2V, reset asserted ISINK = 1.2mA, VCC 3.2V, reset not asserted, MAX6327 only ISINK = 3.2mA, VCC 4.5V, reset not asserted, VTH 4.38V ISINK = 3.2mA, VCC = VTH(MAX), VTH 4.5V RESET Threshold Hysteresis Open-Drain RESET Output Leakage Current Note 1: Overtemperature limits are guaranteed by design and not production tested. MAX6326/MAX6327/MAX6328 MAX6346/MAX6347/MAX6348 6.3 9.5 0.1 0.8 * VCC 0.8 * VCC 0.8 * VCC 0.8 * VCC 0.8 * VCC 0.3 0.4 0.4 mV A V V VTH/C VCC = VTH to (VTH - 100mV) 100 VTH 1.5% VTH 2.5% MIN 1.0 1.2 0.5 1.0 VTH VTH 40 20 185 280 0.3 V 0.4 TYP MAX 5.5 5.5 1.0 1.75 VTH + 1.5% VTH + 2.5% UNITS V
Supply Current
A
V
ppm/C s ms
2
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3-Pin, Ultra-Low-Power SC70/SOT P Reset Circuits
__________________________________________Typical Operating Characteristics
(TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
0.9 0.8 SUPPLY CURRENT (A) RESET DELAY (s) 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 -40 -20 0 20 40 60 80 TEMPERATURE (C) VCC = 1.2V 0 -40 -20 0 50 VOD = 100mV VOD = 200mV 20 40 60 80 TEMPERATURE (C) VCC = 3.3V VCC = 5V 150
MAX6326-01
MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348
POWER-DOWN RESET DELAY vs. TEMPERATURE
200
MAX6326-02
1.0
100
VOD = 20mV VOD = 10mV
POWER-UP RESET TIMEOUT vs. TEMPERATURE
MAX6326-03
MAXIMUM TRANSIENT DURATION vs. RESET THRESHOLD OVERDRIVE (SC70)
MAXIMUM TRANSIENT DURATION (s)
MAX6326-04
210 POWER-UP RESET TIMEOUT (ms) 200 190 180 170 160 150 140 130 -40 -20 0 20 40 60 80 TEMPERATURE (C)
500
400
300
200
100
0 1 10 100 1000 RESET THRESHOLD OVERDRIVE, VTH - VCC (mV)
______________________________________________________________Pin Description
PIN PIN MAX6327 MAX6347 1 NAME GND Ground 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. 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. Supply Voltage FUNCTION MAX6326/MAX6346 MAX6328/MAX6348 1
2
--
RESET
-- 3
2 3
RESET VCC
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3-Pin, Ultra-Low-Power SC70/SOT P Reset Circuits MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348
____________ 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 VCC
MAX6328 MAX6348
P
RESET RESET INPUT MOTOROLA 68HCXX
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 MAX632_ _R MAX632_ _R MAX632_ _R MAX632_ _R MAX632_ _R MAX632_ _R MAX632_ _R MAX632_ _R MAX632_ _R MAX632_ _R MAX634_ _R MAX634_ _R MAX634_ _R MAX634_ _R MAX634_ _R MAX634_ _R SUFFIX MIN 22 23 24 25 26 27 28 29 30 31 33 34 35 36 37 38 2.167 2.285 2.364 2.462 2.591 2.660 2.758 2.886 2.955 3.034 3.250 3.349 3.447 3.546 3.644 3.743 TA = +25C TYP 2.200 2.320 2.400 2.500 2.630 2.700 2.800 2.930 3.000 3.080 3.300 3.400 3.500 3.600 3.700 3.800 MAX 2.233 2.355 2.436 2.537 2.669 2.741 2.842 2.974 3.045 3.126 3.350 3.451 3.552 3.654 3.755 3.857 TA = -40C to +85C MIN 2.145 2.262 2.340 2.437 2.564 2.633 2.730 2.857 2.925 3.003 3.217 3.315 3.412 3.510 3.607 3.705 MAX 2.250 2.375 2.460 2.562 2.696 2.768 2.870 3.000 3.075 3.150 3.383 3.485 3.587 3.690 3.792 3.895
Factory-trimmed reset thresholds are available in approximately 100mV increments with a 1.5% room-temperature variance.
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_______________________________________________________________________________________
3-Pin, Ultra-Low-Power SC70/SOT P Reset Circuits MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348
Table 1. Factory-Trimmed Reset Thresholds (continued)
RESET THRESHOLD VOLTAGE, VTH (V) PART MAX634_ _R MAX634_ _R MAX634_ _R MAX634_ _R MAX634_ _R MAX634_ _R MAX634_ _R MAX634_ _R SUFFIX MIN 39 40 41 42 43 44 45 46 3.841 3.940 4.038 4.137 4.235 4.314 4.432 4.560 TA = +25C TYP 3.900 4.000 4.100 4.200 4.300 4.380 4.500 4.630 MAX 3.958 4.060 4.161 4.263 4.364 4.446 4.567 4.699 TA = -40C to +85C MIN 3.802 3.900 3.997 4.095 4.192 4.270 4.387 4.514 MAX 3.997 4.100 4.202 4.305 4.407 4.489 4.612 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
TOP MARK PART SOT23 MAX6346_R46-T MAX6346_R45-T MAX6346_R44-T MAX6346_R43-T MAX6346_R42-T MAX6346_R41-T MAX6346_R40-T MAX6346_R39-T MAX6346_R38-T MAX6346_R37-T MAX6346_R36-T MAX6346_R35-T MAX6346_R34-T MAX6346_R33-T MAX6326_R31-T MAX6326_R30-T MAX6326_R29-T MAX6326_R28-T MAX6326_R27-T MAX6326_R26-T MAX6326_R25-T MAX6326_R24-T MAX6326_R23-T MAX6326_R22-T FZBI FZBH FZBG FZBF FZBE FZBD FZBC FZBB FZBA FZAZ FZAY FZAX FZAW FZAV FDAA FEAA FCAA FBAA FAAA EZAA EYAA EXAA EWAA EHAA SC70 ACO - ACK - - - - - - - - - - - ACE - ACP - - ACI - - ACH AAH ORDER INCREMENT (k) 2.5 10 2.5 10 10 10 10 10 10 10 10 10 10 10 2.5 10 2.5 10 10 2.5 10 10 2.5 2.5 TOP MARK PART SOT23 MAX6347_R46-T MAX6347_R45-T MAX6347_R44-T MAX6347_R43-T MAX6347_R42-T MAX6347_R41-T MAX6347_R40-T MAX6347_R39-T MAX6347_R38-T MAX6347_R37-T MAX6347_R36-T MAX6347_R35-T MAX6347_R34-T MAX6347_R33-T MAX6327_R31-T MAX6327_R30-T MAX6327_R29-T MAX6327_R28-T MAX6327_R27-T MAX6327_R26-T MAX6327_R25-T MAX6327_R24-T MAX6327_R23-T MAX6327_R22-T FZBW FZBV FZBU FZBT FZBS FZBR FZBQ FZBP FZBO FZBN FZBM FZBL FZBK FZBJ FMAA FNAA FLAA FKAA FJAA FIAA FHAA FGAA FFAA EIAA SC70 ACF - ACL - - - - - - - - - - - ACT - ACS - - ACR - - ACQ AAI ORDER INCREMENT (k) 2.5 10 2.5 10 10 10 10 10 10 10 10 10 10 10 2.5 10 2.5 10 10 2.5 10 10 2.5 2.5
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5
3-Pin, Ultra-Low-Power SC70/SOT P Reset Circuits MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348
Table 2. Device Marking Codes and Minimum Order Increments (continued)
TOP MARK PART SOT23 MAX6348_R46-T MAX6348_R45-T MAX6348_R44-T MAX6348_R43-T MAX6348_R42-T MAX6348_R41-T MAX6348_R40-T MAX6348_R39-T MAX6348_R38-T MAX6348_R37-T MAX6348_R36-T MAX6348_R35-T FZCK FZCJ FZCI FZCH FZCG FZCF FZCE FZCD FZCC FZCB FZCA FZBZ SC70 ACN - ACM - - - - - - - - - ORDER INCREMENT (k) 2.5 10 2.5 10 10 10 10 10 10 10 10 10 TOP MARK PART SOT23 MAX6348_R34-T MAX6348_R33-T MAX6328_R31-T MAX6328_R30-T MAX6328_R29-T MAX6328_R28-T MAX6328_R27-T MAX6328_R26-T MAX6328_R25-T MAX6328_R24-T MAX6328_R23-T MAX6328_R22-T FZBY FZBX FVAA FWAA FUAA FTAA FSAA FRAA FQAA FPAA FOAA EJAA SC70 - - ACW - ACV - - ACJ - - ACU AAJ ORDER INCREMENT (k) 10 10 2.5 10 2.5 10 10 2.5 10 10 2.5 2.5
Selector Guide (standard versions*)
PART MAX634_ _R46-T MAX634_ _R44-T MAX632_ _R31-T MAX632_ _R29-T MAX632_ _R26-T MAX632_ _R23-T MAX632_ _R22-T NOMINAL VTH (V) 4.63 4.38 3.08 2.93 2.63 2.32 2.20
___________________Chip Information
TRANSISTOR COUNT: 419
*Sample stock is generally held on all standard versions.
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3-Pin, Ultra-Low-Power SC70/SOT P Reset Circuits
________________________________________________________Package Information
SOTPO3L.EPS
MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348
_______________________________________________________________________________________
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3-Pin, Ultra-Low-Power SC70/SOT P Reset Circuits MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348
Package Information (continued)
SC70, 3L.EPS
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) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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