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| 型号： | SP791CN-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 8/19页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU LP 16NSOIC |
| 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： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC N |
| 包装： | 带卷 (TR) |
+5V
0.1 μ F
0.1 μ F
CMOS
RAM
0.47F
V cc
V BATT
BATT
ON
SWT
V OUT
OTHER SYSTEM
RESET SOURCES
MR
CE OUT
CE IN
ADDRESS
DECODE
UNREGULATED
SUPPLY
PFI
Corporation
WDI
AO-A15
μ P
I/O
PFO
LOWLINE
RESET
NMI
RESET
UNREGULATED
SUPPLY FAILURE
GND
WDO
INT
Typical Operating Circuit
MR
25 μ s MIN
MANUAL RESET
MR
7 μ s TYP
RESET
OTHER
*
Corporation
CE IN
0V
RESET
SOURCES
*
CE OUT
15 μ s TYP
* DIODES NOT REQUIRED ON OPEN-DRAIN OUTPUTS
Figure 2. Manual-Reset Timing Diagram
FEATURES
The SP791 is a microprocessor ( μ P) supervi-
sory circuit that monitors the power supplied to
digital circuits such as microprocessors,
microcontrollers, or memory. The SP791 is an
ideal solution for portable, battery-powered
equipment that require power supply monitor-
ing. The SP791 watchdog functions will con-
tinuously oversee the operational status of a sys-
tem. Implementing the SP791 will reduce the
number of components and overall complexity
in a design that requires power supply monitor-
ing circuitry. The operational features and ben-
efits of the SP791 are described in more detail
below.
THEORY OF OPERATION
The SP791 is a complete μ P supervisor IC and
provides the following main functions:
1) μ P reset ? RESET output is asserted during
power fluctuations such as power-up, power-
down, and brown out conditions, and is guar-
anteed to be in the correct state for V CC down
to 1V.
Figure 3. Diode "OR" connections allow multiple reset
sources to connect to MR.
2) Manual-Reset input ? Manually resets
RESET output
3) Power Fail Comparator ? Provides for power-
fail warning and low-battery detection, or
monitors another power supply.
4) Watchdog function ? Monitors μ P activity
where the watchdog output goes to a logic
LOW state if the watchdog input is not toggled
for a period greater than the timeout period.
5) Internal switch ? Switches over from V CC to
V BATT if the V CC falls below the reset thresh-
old and below V BATT .
MANUAL RESET INPUT
Many microprocessor or microcontroller prod-
ucts include manual-reset capability, allowing
the operator or test technician to initiate a reset.
The Manual Reset Input (MR) can be connected
directly to a switch, without an external pull-up
resistor. It connects to a 1.25V comparator, and
has an internal pull-up to V OUT as shown in Fig-
ure 1 . The propagation delay from asserting MR
to RESET being asserted is 7us typical. Pulsing
SP791DS/08
SP791 Low Power Microprocessor Supervisory with Battery Switch-Over
8
? Copyright 2000 Sipex Corporation
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP791CP | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP791EB | 功能描述:插座和适配器 Low Power MPU Sprvsr w/Battry Switch-Over RoHS:否 制造商:Silicon Labs 产品:Adapter 用于:EM35x |
| SP791EK | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP791EN | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP791EN-L | 功能描述:监控电路 LW PWR MICRO 5.5V 25mA-250mA BAT SW/OV RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
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