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| 型号： | SP705EN-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 10/17页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU LP 8NSOIC |
| 标准包装： | 2,500 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 复位： | 低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 4.65V |
| 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-SOIC |
| 包装： | 带卷 (TR) |
| 其它名称： | SP705EN-L/TR-ND |
S P 7 0 5 - S P 7 0 8 - S P 8 1 3 L
L o w P o w e r M i c r o p r o c e s s o r S u p e r v i s o r y C i r c u i t s
Fig. 18: SP705/706/813L Watchdog Timing Waveforms
Fig. 20: Typical Operating Circuit
M ANUAL R ESET
The manual-reset input ( MR ) allows RESET to
be triggered by a pushbutton switch. The
switch is effectively debounced by the 140ms
minimum RESET pulse width. MR is TTL/CMOS
logic compatible, so it can be driven by an
Fig. 19: SP705/706 Timing Diagrams with WDI tri-stated.
P OWER -F AIL C OMPARATOR
The power-fail comparator can be used for
various purposes because its output and non
inverting input are not internally connected.
The inverting input is internally connected to a
1.25V reference.
To build an early-warning circuit for power
failure, connect the PFI pin to a voltage divider
as shown in Figure 20. Choose the voltage
divider ratio so that the voltage at PFI falls
below 1.25V just before the +5V regulator
drops out. Use PFO to interrupt the μP so it
can prepare for an orderly power-down.
external logic line. MR can be used to force a
watchdog timeout to generate a RESET pulse
in the SP705/706/813L. Simply connect WDO
to MR .
Ensuring a Valid Reset Output Down to
V CC =0V
When V CC falls below 1.1V, the
SP705/706/707/708 RESET output no longer
sinks current, it becomes an open circuit.
High-impedance CMOS logic inputs can drift to
undetermined voltages if left undriven. If a
pull-down resistor is added to the RESET pin,
any stray charge or leakage currents will be
shunted to ground, holding RESET LOW. The
resistor value is not critical. It should be about
100KW, large enough not to load RESET and
small enough to pull RESET to ground.
? 2010 Exar Corporation
10/17
Rev. 2.0.0
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP705EP | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Low Power Microprocessor Supervisory Circuits |
| SP705EP-L | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| SP705EP-L/TR | 制造商:EXAR 制造商全称:EXAR 功能描述:Low Power Microprocessor Supervisory Circuits |
| SP705EU | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Low Power Microprocessor Supervisory Circuits |
| SP705EU-L/TR | 制造商:EXAR 制造商全称:EXAR 功能描述:Low Power Microprocessor Supervisory Circuits |
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