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MAX6361LUT Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX6361LUT Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 12 page SOT23, Low-Power µP Supervisory Circuits with Battery Backup _______________________________________________________________________________________ 7 Operating Circuit, the MAX6362 monitors two supply voltages. To monitor the secondary 5V logic or analog supply with a 4.60V nominal programmed reset thresh- old, choose R2 = 100k Ω, and calculate R1 = 273kΩ. Reset Output A µP’s reset input starts the µP in a known state. The MAX6361–MAX6364 µP supervisory circuits assert a reset to prevent code-execution errors during power- up, power-down, and brownout conditions. RESET is guaranteed to be a logic low or high depending on the device chosen (see Ordering Information). RESET or RESET asserts when VCC is below the reset threshold and for at least 150ms (tRP) after VCC rises above the reset threshold. RESET or RESET also asserts when MR is low (MAX6361) and when RESET IN is less than 1.235V (MAX6364). The MAX6362 watchdog function will cause RESET (or RESET) to assert in pulses follow- ing a watchdog timeout (Figure 1). Applications Information Operation Without a Backup Power Source The MAX6361–MAX6364 were designed for battery- backed applications. If a backup battery is not used, connect VCC to OUT and connect BATT to GND. Replacing the Backup Battery If BATT is decoupled with a 0.1µF capacitor to ground, the backup power source can be removed while VCC remains valid without danger of triggering a reset pulse. The device does not enter battery-backup mode when VCC stays above the reset threshold voltage. Negative-Going VCC Transients These supervisors are relatively immune to short-dura- tion, negative-going VCC transients. Resetting the µP when VCC experiences only small glitches is usually not desirable. The Typical Operating Characteristics section shows a graph of Maximum Transient Duration vs. Reset Threshold Overdrive for which reset is not asserted. The graph was produced using negative-going VCC pulses, starting at VCC and ending below the reset threshold by the magnitude indicated (reset threshold overdrive). The graph shows the maximum pulse width that a negative-going VCC transient can typically have without triggering a reset pulse. As the amplitude of the transient increases (i.e., goes further below the reset threshold), the maximum allowable pulse width decreases. Typically, a VCC transient that goes 100mV below the reset threshold and lasts for 30µs will not trigger a reset pulse. A 0.1µF bypass capacitor mounted close to the VCC pin provides additional transient immunity. RESET WDI tRP tRP tWD tWD = WATCHDOG TIMEOUT PERIOD tRP = RESET TIMEOUT PERIOD tWD Figure 1. MAX6362 Watchdog Timeout Period and Reset Active Time |
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