MAX690AMJA-883B Maxim Integrated Products, Inc., MAX690AMJA-883B Datasheet - Page 5

• Manufacturer Part Number: MAX690AMJA-883B
• Description: Max690a, Max692a, Max802l, Max802m, Max805l Microprocessor Supervisory Circuits
• Manufacturer: Maxim Integrated Products, Inc.

______________________________________________________________Pin Description
MAX690A/MAX692A
MAX802L/MAX802M
1
2
3
4
5
6
7
–
8
PIN
_______________________________________________________________________________________
MAX805L
Microprocessor Supervisory Circuits
1
2
3
4
5
6
7
8
RESET
RESET
NAME
V
V
GND
WDI
V
PFO
PFI
BATT
OUT
CC
Supply Output for CMOS RAM. When V
V
is below the reset threshold, the higher of V
connected to V
+5V Supply Input
Ground
Power-Fail Comparator Input. When PFI is less than 1.25V, PFO goes
low. Connect PFI to GND or V
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.
Reset Output. Whenever RESET is triggered, it pulses low for 200ms. It
stays low when V
MAX690A/MAX802L and 4.4V in the MAX692A/MAX802M) and remains
low for 200ms after V
timeout also triggers RESET.
Active-High Reset Output is the inverse of RESET. When RESET is
asserted, the RESET output voltage = V
higher.
Backup-Battery Input. When V
will be switched to V
rises to 20mV above V
hysteresis prevents repeated switching if V
OUT
connects to V
OUT
CC
.
CC
is below the reset threshold (4.65V in the
OUT
CC
through a P-channel MOSFET switch. When V
BATT
rises above the reset threshold. A watchdog
if V
, V
BATT
OUT
FUNCTION
CC
CC
is 20mV greater than V
will be reconnected to V
when not used.
falls below the reset threshold, V
CC
CC
or V
CC
is above the reset threshold,
CC
falls slowly.
or V
BATT
BATT
, whichever is
will be
CC
CC
. When V
. The 40mV
BATT
CC
CC
5