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MAX692AMJA Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX692AMJA Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 12 page Microprocessor Supervisory Circuits _______________________________________________________________________________________ 5 ______________________________________________________________Pin Description NAME FUNCTION MAX805L 1 1 VOUT 2 2 VCC +5V Supply Input 3 3 GND Ground 4 4 PFI 5 5 PFO 6 6 WDI 7 RESET 8 8 VBATT Power-Fail Comparator Input. When PFI is less than 1.25V, PFO goes low. Connect PFI to GND or VCC when not used. Power-Fail Output. When PFI is less than 1.25V, PFO goes low; otherwise PFO stays high. Watchdog Input. If WDI remains high or low for 1.6sec, the internal watchdog timer runs out and reset is triggered. If WDI is left floating or connected to a high-impedance three-state buffer, the watchdog feature is disabled. The internal watchdog timer clears whenever reset is asserted, WDI is three-stated, or WDI sees a rising or falling edge. PIN MAX690A/MAX692A MAX802L/MAX802M Reset Output. Whenever RESET is triggered, it pulses low for 200ms. It stays low when VCC is below the reset threshold (4.65V in the MAX690A/MAX802L and 4.4V in the MAX692A/MAX802M) and remains low for 200ms after VCC rises above the reset threshold. A watchdog timeout also triggers RESET. Supply Output for CMOS RAM. When VCC is above the reset threshold, VOUT connects to VCC through a P-channel MOSFET switch. When VCC is below the reset threshold, the higher of VCC or VBATT will be connected to VOUT. Backup-Battery Input. When VCC falls below the reset threshold, VBATT will be switched to VOUT if VBATT is 20mV greater than VCC. When VCC rises to 20mV above VBATT, VOUT will be reconnected to VCC. The 40mV hysteresis prevents repeated switching if VCC falls slowly. – 7 RESET Active-High Reset Output is the inverse of RESET. When RESET is asserted, the RESET output voltage = VCC or VBATT, whichever is higher. |
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