MAX808N Maxim Integrated Products, MAX808N Datasheet - Page 7

• Manufacturer Part Number: MAX808N
• Description: (MAX801x / MAX808x) Supervisory Circuits
• Manufacturer: Maxim Integrated Products

Figure 1. Functional Diagram
_________________________________________________Pin Description (continued)
MAX801
—
—
5
6
7
8
CE IN
PIN
BATT
GND
V
CC
MAX808
—
—
5
6
7
8
_______________________________________________________________________________________
CE OUT
NAME
RESET
CE IN
BATT
OUT
WDI
2.275V
BATTERY-BACKUP
COMPARATOR
RESET
COMPARATOR
LOW-LINE
COMPARATOR
Active-High Reset Output. RESET is the inverse of RESET. It is a CMOS output that
sources and sinks current. RESET swings between V
Chip-Enable Output. Output to the chip-enable gating circuit. CE OUT is pulled up to
the higher of V
Watchdog Input. If WDI remains high or low longer than the watchdog timeout period
(typically 1.6sec), RESET will be asserted for 200ms. Leave unconnected to disable the
watchdog function.
Chip-Enable Input
Backup-Battery Input. When V
es from V
MAX801/MAX808 is powered up, provided BATT is bypassed with a 0.1µF capacitor to
GND. If no battery is used, connect BATT to ground and V
Output Supply Voltage to CMOS RAM. When V
OUT connects to V
nects to BATT. Bypass OUT with a 0.1µF capacitor to GND.
8-Pin µP Supervisory Circuits
CC
with ±1.5% Reset Accuracy
to BATT. V
OSCILLATOR
CC
or V
CC
. When V
BATT
BATT
when the chip-enable gate is disabled.
may exceed V
CC
CC
falls below the reset threshold and V
P
N
falls below the reset threshold and V
FUNCTION
TRANSITION
WATCHDOG
DETECTOR
MACHINE
STATE
CC
MAX801
MAX808
. The battery can be removed while the
CC
exceeds the reset threshold or V
THE HIGHER
CC
OR V
OF V
and GND.
BATT
CC
P
CC
to OUT.
CE OUT
OUT
LOWLINE
WDI
RESET (MAX801 ONLY)
RESET
BATT
BATT
MAX808 ONLY
MAX801 ONLY
, OUT switch-
, OUT con-
BATT
,
7