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參數(shù)資料
| 型號： | MAX801NMJA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | Interface IC |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, CDIP8 |
| 封裝： | 0.300 INCH, CERDIP-8 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大小： | 91K |
| 代理商： | MAX801NMJA |
M
8-Pin μP S upervisory Circ uits
with ±1.5% Reset Ac c urac y
_______________________________________________________________________________________
7
_________________________________________________Pin Desc ription (c ontinued)
Active-High Reset Output. RESET is the inverse of
RESET
. It is a CMOS output that
sources and sinks current. RESET swings between V
CC
and GND.
—
5
Chip-Enable Output. Output to the chip-enable gating circuit.
CE
OUT is pulled up to
the higher of V
CC
or V
BATT
when the chip-enable gate is disabled.
5
—
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.
—
6
Chip-Enable Input
6
—
RESET
CE
OUT
WDI
CE
IN
BATT
OUT
Backup-Battery Input. When V
CC
falls below the reset threshold and V
BATT
, OUT switch-
es from V
CC
to BATT. V
BATT
may exceed V
CC
. The battery can be removed while the
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
CC
to OUT.
7
7
Output Supply Voltage to CMOS RAM. When V
CC
exceeds the reset threshold or V
BATT
,
OUT connects to V
CC
. When V
CC
falls below the reset threshold and V
BATT
, OUT con-
nects to BATT. Bypass OUT with a 0.1μF capacitor to GND.
8
8
NAME
MAX801
MAX808
FUNCTION
PIN
MAX801
MAX808
CE IN
GND
V
CC
BATT
THE HIGHER
OF V
CC
OR V
BATT
MAX801 ONLY
MAX808 ONLY
BATTERY-BACKUP
COMPARATOR
RESET
COMPARATOR
LOW-LINE
COMPARATOR
2.275V
OUT
LOWLINE
WDI
RESET (MAX801 ONLY)
RESET
CE OUT
P
P
N
WATCHDOG
TRANSITION
DETECTOR
STATE
MACHINE
OSCILLATOR
Figure 1. Functional Diagram
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