|Description||3-pin, Ultra-low-power Sc70/sot ¥ìP Reset Circuits|
|Company||Maxim Integrated Products|
|Datasheet||Download MAX6346XR-T datasheet
The MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/ MAX6348 microprocessor (µP) supervisory circuits monitor the power supplies in µP and digital systems. These devices provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with 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 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 (1µA 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 1µA (max) Supply Current (MAX6326/MAX6327/MAX6328) o Precision Monitoring 3V, 3.3V, and 5V Power-Supply Voltages o Reset Thresholds Available from 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 Power-Supply Transient Immunity o No External Components 3-Pin SC70/SOT23 Packages o Pin Compatible with MAX803/MAX809/MAX810Applications
Computers Controllers Critical µP and µC Power Monitoring Intelligent Instruments Automotive Portable/Battery-Powered Equipment
The MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/ MAX6348 are available in factory-set VCC reset thresholds from 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.
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.
Terminal Voltage (with respect to GND) to +6V RESET, RESET (push-pull).........................-0.3V to (VCC + 0.3V) RESET (open to +6V Input Current (VCC).............................................................20mA Output Current (RESET, RESET).........................................20mA Rate of Rise (VCC)...........................................................100V/µs Continuous Power Dissipation (TA 3-Pin SC70 (derate 2.7mW/°C above 3-Pin SOT23 (derate 4mW/°C above +70°C)................320mW Operating Temperature to +85°C Storage Temperature to +150°C Lead Temperature (soldering, 10s).................................+300°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.
(VCC = full range, to +85°C, unless otherwise noted. Typical values are = +25°C and VCC = 3V.) (Note 1) PARAMETER VCC Range SYMBOL CONDITIONS to +85°C ICC MAX632_ only, VCC = 3.0V for VTH 2.93V, VCC = 3.2V for VTH 2.93V, no load VCC 5.5V, no load = +25°C Reset Threshold VTH Table to +85°C 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 = 100µA, VCC 1.2V, reset asserted ISOURCE = 500µA, VCC 3.2V, MAX6326 only VOH ISOURCE = 800µA, VCC = 4.5V, VTH 4.38V ISOURCE = 800µA, VCC = VTH(MAX), VTH 4.5V VOH RESET Output Voltage (MAX6327/MAX6347) VOL ISOURCE = 500µA, VCC 2.1V, reset asserted ISOURCE = 50µA, 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 VCC 0.8 VCC 0.8 VCC 0.8 VCC 0.8 VCC µA V VTH/°C VCC = VTH to (VTH 100mV) 100 VTH 1.5% VTH 2.5% MIN VTH V 0.4 TYP MAX VTH + 1.5% VTH + 2.5% UNITS VMAXIMUM TRANSIENT DURATION vs. RESET THRESHOLD OVERDRIVE (SC70)
PIN 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 MAX6328/MAX6348 1
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