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| 型号： | MIC2786-XAYMT TR |
| 厂商： | Micrel Inc |
| 文件页数： | 11/17页 |
| 文件大小： | 0K |
| 描述： | IC DUAL PUSH BUTTON RESET 8MLF |
| 特色产品： | MIC2786 and MIC2787 Pushbutton Reset IC |
| 标准包装： | 1 |
| 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： | 4.625V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-UFDFN 裸露焊盘，8-TMLF? |
| 供应商设备封装： | 8-TMLF?（2x2） |
| 包装： | 标准包装 |
| 其它名称： | 576-4005-6 |
Micrel, Inc.
MIC2786/MIC2787
Asserting /RST and RSTP Outputs
a) When Functioning as a Manual Reset
The reset outputs /RST and RSTP are asserted when
the setup delay time, t SETUP , is exceeded while the /MR0,
/MR1 pins are driven low. Both the reset outputs remain
asserted for a factory-programmed reset timeout delay
time t RESET . Two options are available with 140ms or
240ms minimum t RESET duration. The /RST pin is driven
active low while the RSTP pin is driven active high for
the t RESET duration. The reset outputs are undefined for
V IN < 1.6V.
Figure 3. Voltage Monitor Function
V IN Transients
The MIC2786/MIC2787 is relatively immune to small
negative-going V IN glitches below the reset threshold. As
shown in Figure 4, the overdrive voltage is the difference
between the threshold voltage and the minimum point of
the V IN glitch. Typically, an overdrive of 100mV, with
duration of 20 μ s or less will not cause a reset.
Figure 2. Manual Reset Function
b) When Functioning as a Voltage Monitor
The /RST pin is asserted whenever V IN falls below the
reset threshold voltage, V TH (V IN < V TH ). The V IN pin
circuitry includes hysteresis to prevent /RST or RSTP pin
chattering due to noise. The /RST pin remains asserted
for the duration of the reset timeout delay (t RESET ) after
V IN has risen above the reset threshold voltage plus the
hysteresis. The reset function ensures a microprocessor
is properly reset and powers up in a known condition
after a power failure. /RST remains valid with V IN as low
as 1.6V. The RSTP output is a compliment of the /RST
output.
Figure 4. V IN Transient
October 2011
11
M9999-102711-A
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