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參數(shù)資料
| 型號： | MCP120 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Microcontroller Supervisory Circuit with Push-Pull Output(漏極開路輸出微控制器監(jiān)控電路) |
| 中文描述： | 微控制器監(jiān)控電路與推，拉輸出（漏極開路輸出微控制器監(jiān)控電路） |
| 文件頁數(shù)： | 3/8頁 |
| 文件大?。?/td> | 91K |
| 代理商： | MCP120 |
1999 Microchip Technology Inc.
Preliminary
DS11184C-page 3
MCP120/130
FIGURE 1:
MCP120/130 Timing Diagram
2.0
APPLICATIONS INFORMATION
2.1
The Need for Supervisory Circuits
For many of today’s microcontroller applications, care
must be taken to prevent low power conditions that can
cause many different system problems. The most com-
mon causes are brown-out conditions where the sys-
tem supply drops below the operating level momentar-
ily, and the second, is when a slowly decaying power
supply causes the microcontroller to begin executing
instructions without enough voltage to sustain SRAM
and producing indeterminate results.
FIGURE 2-1:
Typical Application
2.2
Negative Going V
DD
Transients
Many system designers implementing POR circuits are
concerned about the minimum pulse width required to
cause a reset. Figure 2-2 shows typical transient
voltage below the trip point (V
TRIP
- V
DD
) vs. transient
duration. It shows that the farther below the trip point
the transient pulse goes, the duration of the pulse
required to cause a reset gets shorter. A 0.1 μF bypass
cap mounted as close as possible to the V
DD
pin pro-
vides additional transient immunity.
FIGURE 2-2:
Typical Transient Response
V
DD
RESET
V
OH
t
RPU
V
TRIP
t
RPD
V
OH
MICROCONTROLLER
OR
RESET
V
DD
V
SS
RST
MCP130
V
SS
V
DD
V
DD
cbypass
TIME
S
0
0
5V
V
TRIP
MAX
V
TRIP
MIN
T
RANSIENT
D
URATION
(V
TRIP
MIN
-
V
DD
)
0
1
2
3
V
TRIP
- V
DD
(V)
10
8
6
4
2
0
T
4
5
Transients above the
curve will cause a reset
Transients below
the curve will NOT
cause a reset
T
A
= +25°C
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