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參數(shù)資料
| 型號： | MAX820 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Microprocessor and Non-Volatile Memory Supervisory Circuits |
| 中文描述： | 微處理器及非易失存儲器監(jiān)控電路 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大小： | 250K |
| 代理商： | MAX820 |
M
Mic roproc essor and Non-Volatile
Memory S upervisory Circ uits
10
______________________________________________________________________________________
Low-Line Output
In internal threshold mode, the low-line comparator
monitors V
CC
with a threshold voltage typically 120mV
above the reset threshold, and with 15mV of hysteresis.
For normal operation (V
CC
above the reset threshold),
LOWLINE
is pulled to V
CC
. Use
LOWLINE
to provide an NMI
to the μP, as described in the previous section, when
V
CC
begins to fall (Figure 4).
Reset Func tion
The MAX792/MAX820 provide both RESET and
RESET
outputs. The RESET and
RESET
outputs ensure that the
μP powers up in a known state, and prevent code-exe-
cution errors during power-up, power-down, or
brownout conditions.
The reset function will be asserted during the following
conditions:
1) V
CC
less than the programmed reset threshold.
2)
MR
less than 1.30V typ.
3) Reset remains asserted for 200ms typ after V
CC
rises above the reset threshold or after
MR
has
exceeded 1.30V typ.
When reset is asserted, all the internal counters are
reset, the watchdog output (
WDO
)
and watchdog-pulse
output
(
WDPO
)
are set high, and the set watchdog-time-
out input (SWT) is set to (V
CC
- 0.6V) if it is not already
connected to V
CC
(for internal timeouts). The chip-
enable transmission gate is also disabled while reset is
asserted; the chip-enable input (
CE
IN) becomes high
impedance and the chip-enable output (
CE
OUT) is
pulled up to V
CC
.
MR
RESET
CE IN OV
CE OUT
25
μ
s MIN
12
μ
s TYP
15
μ
s TYP
Figure 2. Manual-Reset Timing Diagram
MAX792
MAX820
MANUAL RESET
OTHER
RESET
SOURCES
9
MR
*
*
*
.
DIODES NOT REQUIRED ON OPEN-DRAIN OUTPUTS
Figure 3. Diode "OR"connections allow multiple reset sources
to connect to
MR
.
MAX792
12
GND
3
V
CC
LLIN/REFOUT
RESET
RESET
LOW LINE
RESET IN/INT
4
5
2
10
1
TO
μ
P
TO
μ
P
TO
μ
P NMI
V
IN
Figure 4a. Connection for Internal Threshold Mode
MAX792
GND
V
CC
TO
μ
P
TO
μ
P
TO
μ
P NMI
2
1
10
RESET IN/INT
LLIN/REFOUT
RESET
RESET
LOW LINE
12
V
IN
R3 = 1.30V x V
CC
MAX
V
LOW LINE
x I
MAX
R2 = 1.30V x V
CC
MAX
V
RESET
x I
MAX
–
R3
R1 = V
CC
MAX
I
MAX
– (R2 + R3)
I
= THE MAXIMUM DESIRED CURRENT
THROUGH THE VOLTAGE DIVIDED.
3
R3
R2
R1
Figure 4b. Connection for External Threshold Programming Mode
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX820_CPE | Microprocessor and Non-Volatile Memory Supervisory Circuits |
| MAX820_CSE | Microprocessor and Non-Volatile Memory Supervisory Circuits |
| MAX820_EJE | Microprocessor and Non-Volatile Memory Supervisory Circuits |
| MAX820_EPE | Microprocessor and Non-Volatile Memory Supervisory Circuits |
| MAX820_ESE | Microprocessor and Non-Volatile Memory Supervisory Circuits |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX820_CPE | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Microprocessor and Non-Volatile Memory Supervisory Circuits |
| MAX820_CSE | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Microprocessor and Non-Volatile Memory Supervisory Circuits |
| MAX820_EJE | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Microprocessor and Non-Volatile Memory Supervisory Circuits |
| MAX820_EPE | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Microprocessor and Non-Volatile Memory Supervisory Circuits |
| MAX820_ESE | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Microprocessor and Non-Volatile Memory Supervisory Circuits |
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