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MAX6423XS22-T Datasheet(PDF) 4 Page - Maxim Integrated Products |
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MAX6423XS22-T Datasheet(HTML) 4 Page - Maxim Integrated Products |
4 / 10 page Low-Power, SC70/SOT µP Reset Circuits with Capacitor-Adjustable Reset Timeout Delay 4 _______________________________________________________________________________________ Detailed Description Reset Output The reset output is typically connected to the reset input of a µP. A µP’s reset input starts or restarts the µP in a known state. The MAX6340/MAX6421–MAX6426 µP supervisory circuits provide the reset logic to prevent code-execution errors during power-up, power-down, and brownout conditions (see Typical Operating Characteristics). RESET changes from high to low whenever VCC drops below the threshold voltage. Once VCC exceeds the threshold voltage, RESET remains low for the capacitor- adjustable reset timeout period. The MAX6422 active-high RESET output is the inverse logic of the active-low RESET output. All device outputs are guaranteed valid for VCC > 1V. The MAX6340/MAX6423/MAX6425/MAX6426 are open- drain RESET outputs. Connect an external pullup resis- tor to any supply from 0 to 5.5V. Select a resistor value large enough to register a logic low when RESET is asserted and small enough to register a logic high while supplying all input current and leakage paths connected to the RESET line. A 10k Ω to 100kΩ pullup is sufficient in most applications. Selecting a Reset Capacitor The reset timeout period is adjustable to accommodate a variety of µP applications. Adjust the reset timeout period (tRP) by connecting a capacitor (CSRT) between SRT and ground. Calculate the reset timeout capacitor as follows: Pin Description PIN MAX6340 MAX6421 MAX6422 MAX6423 MAX6424 MAX6425 MAX6426 SOT23 SOT143 SC70 SOT23 SOT23 NAME FUNCTION 1 3 3 5 1 SRT Set Reset Timeout Input. Connect a capacitor between SRT and ground to set the timeout period. Determine the period as follows: tRP = 2.73 ✕ 10 6 ✕ CSRT + 275µs with tRP in seconds and CSRT in farads. 2 1 2 3 2, 3 GND Ground 3 —— 4 — N.C. Not Internally Connected. Can be connected to GND. 42 1 2 5 VCC Supply Voltage and Reset Threshold Monitor Input 51 4 RESET RESET changes from high to low whenever VCC drops below the selected reset threshold voltage. RESET remains low for the reset timeout period after VCC exceeds the reset threshold. — 44 —— RESET RESET changes from low to high whenever VCC drops below the selected reset threshold voltage. RESET remains high for the reset timeout period after VCC exceeds the reset threshold. MAX6340 MAX6423 MAX6425 MAX6426 VREF CSRT SRT RESET TIMEOUT N GND RESET LASER-TRIMMED RESISTORS VCC 3.3V 10k Ω 5.0V 5V SYSTEM Figure 1. MAX6340/MAX6423/MAX6425/MAX6426 Open-Drain RESET Output Allows Use with Multiple Supplies |
Similar Part No. - MAX6423XS22-T |
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Similar Description - MAX6423XS22-T |
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