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MAX692A Datasheet(PDF) 5 Page - Maxim Integrated Products

Part # MAX692A
Description  Microprocessor Supervisory Circuits
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX692A Datasheet(HTML) 5 Page - Maxim Integrated Products

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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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