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參數(shù)資料
| 型號(hào)： | MAX809 |
| 廠(chǎng)商： | Maxim Integrated Products, Inc. |
| 元件分類(lèi)： | 復(fù)位半導(dǎo)體 |
| 英文描述： | 3-Pin Microprocessor Reset Circuits(3管腳微處理器復(fù)位監(jiān)視器) |
| 中文描述： | 3引腳微處理器復(fù)位電路 |
| 文件頁(yè)數(shù)： | 4/8頁(yè) |
| 文件大?。?/td> | 78K |
| 代理商： | MAX809 |
M
__________Applic ations Information
Negative-Going V
CC
T ransients
In addition to issuing a reset to the microprocessor (μP)
during power-up, power-down, and brownout condi-
tions, the MAX809/MAX810 are relatively immune to
short duration negative-going V
CC
transients (glitches).
Figure 1 shows typical transient duration vs. reset com-
parator overdrive, for which the MAX809/MAX810 do
not
generate a reset pulse. The graph was generated
using a negative-going pulse applied to V
CC
, starting
0.5V above the actual reset threshold and ending
below it by the magnitude indicated (reset comparator
overdrive). The graph indicates the maximum pulse
width a negative-going V
CC
transient can have without
causing a reset pulse. As the magnitude of the tran-
sient increases (goes farther below the reset threshold),
the maximum allowable pulse width decreases.
Typically, for the MAX809L and MAX810M, a V
CC
tran-
sient that goes 100mV below the reset threshold and
lasts 20μs or less will not cause a reset pulse. A 0.1μF
bypass capacitor mounted as close as possible to the
V
CC
pin provides additional transient immunity.
Ensuring a V alid Reset Output Down to
V
CC
= 0V
When V
CC
falls below 1V, the MAX809
RESET
output
no longer sinks current—it becomes an open circuit.
Therefore, high-impedance CMOS logic inputs con-
nected to
RESET
can drift to undetermined voltages.
This presents no problem in most applications, since
most μP and other circuitry is inoperative with V
CC
below 1V. However, in applications where
RESET
must
be valid down to 0V, adding a pull-down resistor to
RESET
causes any stray leakage currents to flow to
ground, holding
RESET
low (Figure 2). R1’s value is not
critical; 100k
is large enough not to load
RESET
and
small enough to pull
RESET
to ground.
A 100k
pull-up resistor to V
CC
is also recommended
for the MAX810, if RESET is required to remain valid for
V
CC
< 1V.
3-Pin Mic roproc essor Reset Circ uit
4
_______________________________________________________________________________________
2
RESET
(MAX809)
RESET
Output remains low while V
CC
is below the reset threshold, and for
240ms after V
CC
rises above the reset
threshold.
1
GND
Ground
PIN
NAME
FUNCTION
RESET
(MAX810)
RESET Output remains high while V
CC
is below the reset threshold, and for
240ms after V
CC
rises above the reset
threshold.
_____________________Pin Desc ription
400
320
0
1
100
1000
160
80
240
RESET COMPARATOR OVERDRIVE , V
TH
- V
CC
(mV)
M
10
T
A
= +25°C
MAX8_ _L/M
MAX8_ _R/S/T
Figure 1. Maximum Transient Duration without Causing a
Reset Pulse vs. Reset Comparator Overdrive
3
V
CC
Supply Voltage (+5V, +3.3V, or +3.0V)
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| MAX809_EXR-T | 制造商:MAXIM 制造商全稱(chēng):Maxim Integrated Products 功能描述:3-Pin Microprocessor Reset Circuits |
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