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參數(shù)資料
| 型號： | MAX79E |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 3.0V/3.3V Adjustable Microprocessor Supervisory Circuits |
| 中文描述： | 3.0V/3.3V可調微處理器監(jiān)控電路 |
| 文件頁數(shù)： | 9/20頁 |
| 文件大?。?/td> | 150K |
| 代理商： | MAX79E |
brownout conditions. RESET is guaranteed to be a
logic low for 0V < V
CC
< V
RST
, provided V
BATT
is
greater than 1V. Without a backup battery (V
BATT
=
V
CC
= V
OUT
), RESET is guaranteed valid for V
CC
≥
1V.
Once V
CC
exceeds the reset threshold, an internal
timer keeps RESET low for the reset timeout period
(t
RP
); after this interval, RESET becomes high imped-
ance (Figure 2). RESET is an open-drain output, and
requires a pull-up resistor to V
CC
(Figure 3). Use a
4.7k
to 1M
pull-up resistor that will provide sufficient
current to assure the proper logic levels to the μP.
If a brownout condition occurs (V
CC
dips below the
reset threshold), RESET goes low. Each time RESET is
asserted, it stays low for the reset timeout period. Any
time V
CC
goes below the reset threshold, the internal
timer restarts.
The watchdog output (WDO) can also be used to initi-
ate a reset. See the Watchdog Outputsection.
The RESET output is the inverse of the RESET output,
and it can both source and sink current.
M
3.0V /3.3V Adjustable Mic roproc essor
S upervisory Circ uits
_______________________________________________________________________________________
9
V
CC
V
LOWLINE
(MAX793/MAX794)
V
RESET
(RESET PULLED UP TOV
CC
)
V
RESET
(MAX793/MAX794)
V
CE OUT
V
WDO
(MAX793/MAX794)
V
BOK
(MAX793)
V
PFO
(MAX793/MAX794)
SHOWN FOR V
CC
= 3.3V to 0V, V
BATT
= 3.6V, CE IN = GND, PFI = V
CC
.
TYPICAL DELAY TIMES REFLECT A 40mV OVERDRIVE
V
BATT ON
MAX794: V
RESET IN
= V
CC
(V
RST IN
/ V
RST
)
V
BATT
V
BATT
4
μ
s
V
LL
V
RST
V
SW
20
μ
s
20
μ
s
25
μ
s
10
μ
s
25
μ
s
25
μ
s
25
μ
s
25
μ
s
Figure 2. Timing Diagram, V
CC
Falling
相關PDF資料 |
PDF描述 |
|---|---|
| MAX794ESE | 3.0V/3.3V Adjustable Microprocessor Supervisory Circuits |
| MAX794CPE | Quadruple 2-Input Exclusive-OR Gates 14-CDIP -55 to 125 |
| MAX794CSE | Quadruple 2-Input Exclusive-OR Gates 14-CFP -55 to 125 |
| MAX794EPE | 3.0V/3.3V Adjustable Microprocessor Supervisory Circuits |
| MAX793CPE | 3.0V/3.3V Adjustable Microprocessor Supervisory Circuits |
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