参数资料
型号: MCP1318MT-29LE/OT
厂商: Microchip Technology
文件页数: 32/52页
文件大小: 0K
描述: IC SUPERVISOR 2.9V OD/PP SOT23-5
标准包装: 3,000
类型: 简单复位/加电复位
监视电压数目: 1
输出: 开路漏极,推挽式
复位: 高有效/低有效
复位超时: 最小为 140 ms
电压 - 阀值: 2.9V
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: SC-74A,SOT-753
供应商设备封装: SOT-23-5
包装: 带卷 (TR)
MCP131X/2X
4.2 Reset Delay Timer (t RST )
The Reset delay timer ensures that the MCP131X/2X
device will “hold” the embedded system in Reset until
the system voltage has stabilized. There are several
time-out options to better meet the requirements of
different applications. These Reset delay timer time
outs are shown in Table 4-2 . The Standard offering time
Figure 4-15 illustrates when the Reset delay timer
(t RST ) is active or inactive.
V DD
V TRIP
out is typically 200 ms.
The Reset delay timer (t RST ) starts after the device volt-
age rises above the “actual” trip point (V TRIP ) plus the
hysteresis (V HYS ). When the Reset delay timer times
out, the Reset output pin (RST/RST) is driven inactive.
While the Reset delay timer (t RST ) is
Note:
active, additional system current is con-
RST
t RST
Reset
sumed.
Reset Delay
Delay
Timer
TABLE 4-2:
RESET DELAY TIMER
Timer Inactive
Inactive
TIME OUTS ( 1 )
Min
t RST
Typ
Max
Units
See Figures 2-12 ,
See Figures 2-12 ,
1.0
20
1.4
30
2.0
40
ms
ms
See Figures 2-15 ,
140
1120
200
1.6
280
2.24
ms
sec
FIGURE 4-15:
Waveform.
Reset Power-up Timer
This is the
minimum time that
This is the
maximum time
4.2.1
EFFECT OF TEMPERATURE ON
RESET POWER-UP TIMER (T RPU )
the Reset delay
timer will “hold” the
Reset pin active
after V DD rises
above
V TRIP + V HYS
that the Reset
delay timer will
“hold” the Reset
pin active after
V DD rises above
V TRIP + V HYS
The Reset delay timer time out period (t RST )
determines how long the device remains in the Reset
condition. This time out is affected by both the device
V DD and temperature. Typical responses for different
V DD values and temperatures are shown in Figures 2-
33 , 2-32 and 2-31 .
Note 1:
Shaded rows are custom ordered time
outs.
DS21985C-page 32
? 2005-2012 Microchip Technology Inc.
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