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| 型号： | MCP120T-485I/SN |
| 厂商： | Microchip Technology |
| 文件页数： | 4/16页 |
| 文件大小： | 0K |
| 描述： | IC SUPRVSR 4.85V OPN DRAIN 8SOIC |
| 标准包装： | 3,300 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 最小为 150 ms |
| 电压 - 阀值： | 4.725V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 带卷 (TR) |
MCP120/130
2.0
2.1
APPLICATIONS INFORMATION
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.
V DD
V DD
Microcontroller
5V
0
Transient
Duration
0
(V TRIP MIN - V DD )
TIME
V TRIP MAX
V TRIP MIN
V SS
M CP12 0
Bypass
Capacitor
V DD
MCLR
10
8
T A = +25° C
or
RST
RESET
V SS
6
4
2
Transients above the
curve will cause a reset
Transients below
the curve will NOT
Figure 2-1:
Typical Application
0
cause a reset
0 1
2 3
4
5
V TRIP - V DD (V)
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 μ F bypass
cap mounted as close as possible to the V DD pin pro-
vides additional transient immunity.
DS11184D-page 4
Figure 2-2:
Typical Transient Response
? 2001 Microchip Technology Inc.
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