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MAX821MUS-T Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX821MUS-T Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 7 page General Description The MAX821/MAX822 microprocessor (µP) supervisory circuits monitor power supplies in µP and digital sys- tems. They provide excellent circuit reliability and low cost by eliminating external components and adjust- ments when used with 5V-powered or 3V-powered cir- cuits. The MAX821/MAX822 also provide a power-on reset timeout delay that is pin selectable to 1ms (max), 20ms (min), or 100ms (min). These devices perform a single function: they assert a reset signal whenever the VCC supply voltage falls below a preset threshold, and they keep reset asserted for the pin-selected reset timeout delay after VCC has risen above the reset threshold. The only difference between the two devices is that the MAX821 has an active-low RESET output (which is guaranteed to be in the correct state for VCC down to 1V), while the MAX822 has an active-high RESET output. The reset comparator is designed to ignore fast transients on VCC. Reset thresholds suitable for operation with a vari- ety of supply voltages are available. Low supply current makes the MAX821/MAX822 ideal for use in portable equipment. These devices come in a 4-pin SOT143 package. ________________________Applications Bar-Code Scanners Computers Controllers Intelligent Instruments Critical µP and µC Power Monitoring Portable/Battery-Powered Equipment Features ♦ Pin-Selectable, Precision Power-On Reset Delay: 1ms (max), 20ms (min), or 100ms (min) ♦ Precision Monitoring of +3V to +5V Power-Supply Voltages ♦ 2.5µA Supply Current ♦ Guaranteed Over Temperature (-40°C to +125°C) ♦ Guaranteed RESET Valid to VCC = 1V (MAX821) ♦ Power-Supply Transient Immunity ♦ No External Components ♦ SOT143 Package 4-Pin µP Voltage Monitors with Pin-Selectable Power-On Reset Timeout Delay ________________________________________________________________ Maxim Integrated Products 1 1 2 4 3 VCC SRT (RESET) RESET GND MAX821 MAX822 SOT143 TOP VIEW ( ) ARE FOR MAX822 Pin Configuration MAX821 MAX822 VCC RESET (RESET) RESET INPUT GND VCC GND µP ( ) ARE FOR MAX822 SRT 20ms 100ms 1ms __________Typical Operating Circuit 19-1122; Rev 3; 12/05 PART MAX821LUS-T MAX821MUS-T 4.38 4.63 NOMINAL VTH (V) TOP MARK* AZ_ _ BA_ _ Ordering Information * The first two letters in the package top mark identify the part, while the remaining two letters are the lot-tracking code. Devices are available in both leaded and lead-free packaging. Specify lead-free by replacing “-T” with “+T” when ordering. MAX821PUS-T 4.00 BM_ _ MAX821TUS-T 3.08 BB_ _ MAX821SUS-T 2.93 BC_ _ MAX821UUS-T 2.78 BL_ _ MAX821RUS-T 2.63 BD_ _ MAX822LUS-T 4.63 BF_ _ MAX822MUS-T 4.38 BG_ _ MAX822TUS-T 3.08 BH_ _ MAX822SUS-T 2.93 BJ_ _ MAX822RUS-T 2.63 BK_ _ 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. |
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