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MAX810L Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX810L Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 8 page MAX803/MAX809/MAX810 3-Pin Microprocessor Reset Circuits 5 Maxim Integrated Detailed Description A microprocessor’s (µP’s) reset input starts the µP in a known state. The MAX803/MAX809/MAX810 assert reset to prevent code-execution errors during power- up, power-down, or brownout conditions. They assert a reset signal whenever the VCC supply voltage declines below a preset threshold, keeping it asserted for at least 140ms after VCC has risen above the reset thresh- old. The MAX803 uses an open-drain output, and the MAX809/MAX810 have a push-pull output stage. Connect a pullup resistor on the MAX803’s RESET out- put to any supply between 0 and 6V. Applications Information Negative-Going VCC Transients In addition to issuing a reset to the µP during power-up, power-down, and brownout conditions, the MAX803/ MAX809/MAX810 are relatively immune to short-duration negative-going VCC transients (glitches). Figure 1 shows typical transient duration vs. reset com- parator overdrive, for which the MAX803/MAX809/ MAX810 do not generate a reset pulse. The graph was generated using a negative-going pulse applied to VCC, starting 0.5V above the actual reset threshold and end- ing below it by the magnitude indicated (reset compara- tor overdrive). The graph indicates the maximum pulse width a negative-going VCC transient can have without causing a reset pulse. As the magnitude of the transient increases (goes farther below the reset threshold), the maximum allowable pulse width decreases. Typically, for the MAX8__L and MAX8__M, a VCC transient that goes 100mV below the reset threshold and lasts 20µs or less will not cause a reset pulse. A 0.1µF bypass capacitor mounted as close as possible to the VCC pin provides additional transient immunity. Ensuring a Valid Reset Output Down to VCC = 0V When VCC falls below 1V, the MAX809 RESET output no longer sinks current—it becomes an open circuit. 2 RESET (MAX803/ MAX809) RESET Output remains low while VCC is below the reset threshold, and for at least 140ms after VCC rises above the reset threshold. 1 GND Ground PIN NAME FUNCTION RESET (MAX810) RESET Output remains high while VCC is below the reset threshold, and for at least 140ms after VCC rises above the reset threshold. 3 VCC Supply Voltage (+5V, +3.3V, +3.0V, or +2.5V) Selector Guide TOP MARK PART/SUFFIX RESET THRESHOLD (V) OUTPUT TYPE SOT SC70 MAX803L 4.63 OPEN-DRAIN RESET ⎯ AAZ MAX803M 4.38 OPEN-DRAIN RESET ⎯ ABA MAX803T 3.08 OPEN-DRAIN RESET ⎯ ABB MAX803S 2.93 OPEN-DRAIN RESET ⎯ ABC MAX803R 2.63 OPEN-DRAIN RESET ⎯ ABD MAX803Z 2.32 OPEN-DRAIN RESET ⎯ ABE MAX809L 4.63 PUSH-PULL RESET AAAA AAN MAX809M 4.38 PUSH-PULL RESET ABAA AAO MAX809J 4.00 PUSH-PULL RESET CWAA ⎯ MAX809T 3.08 PUSH-PULL RESET ACAA AAP MAX809S 2.93 PUSH-PULL RESET ADAA AAQ MAX809R 2.63 PUSH-PULL RESET AFAA AAR MAX809Z 2.32 PUSH-PULL RESET ⎯ AAS MAX810L 4.63 PUSH-PULL RESET AGAA AAT MAX810M 4.38 PUSH-PULL RESET AHAA AAU MAX810T 3.08 PUSH-PULL RESET AJAA AAV MAX810S 2.93 PUSH-PULL RESET AKAA AAX MAX810R 2.63 PUSH-PULL RESET ALAA AAW MAX810Z 2.32 PUSH-PULL RESET ⎯ AAY Pin Description |
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