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| 型号： | APX803-23SAG-7 |
| 厂商： | Diodes Inc |
| 文件页数： | 5/10页 |
| 文件大小： | 0K |
| 描述： | IC MPU RESET CIRC 2.25V SOT23-3 |
| 标准包装： | 1 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 2.25V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-236-3，SC-59，SOT-23-3 |
| 供应商设备封装： | SOT-23-3 |
| 包装： | 标准包装 |
| 其它名称： | APX803-23SAG-7DIDKR |
APX803
3-PIN MICROPROCESSOR RESET CIRCUIT
Functional Description
Microprocessors (μPs) and microcontrollers (μC) have a reset
input to ensure that it starts up in a known state. The APX803
drive the μP’s reset input to prevent code-execution errors during
power-up, power-down, or brownout conditions. They assert a
reset signal whenever the V CC supply voltage declines below a
preset threshold, keeping it asserted for at least 140ms after V CC
has risen above the reset threshold. The APX803 has an
open-drain output stage.
Ensuring a Valid Reset Output
Down to V CC = 0
RESET is guaranteed to be a logic low for V CC > 1V. Once V CC
drift to undetermined voltages.
This presents no problem in most applications since most μP and
other circuitry is inoperative with V CC below 1V.
Interfacing to μP with Bidirectional Reset Pins
Since the RESET output on the APX803 is open drain, this
device interfaces easily with μ P/μC that have bidirectional reset
pins, such as the Motorola 68HC11.
Connecting the μ P supervisor’s RESET output directly to the
microcontroller’s ( μ C’s) RESET pin with a single pull-up resistor
allows either device to assert reset.
Supervising and monitoring Multiple Supplies
exceeds the reset threshold, an internal timer keeps
RESET
Generally, the pull-up resistor connected to the APX803 will
low for the reset timeout period; after this interval, RESET
goes high. If a brownout condition occurs (V CC dips below the
RESET reset threshold), RESET goes low. Any time
V CC goes below the reset threshold, the internal timer resets to
connect to the supply voltage that is being monitored at the IC’s
V CC pin. However, some systems may use the APX803
open-drain output to level-shift from the monitored supply to reset
the μP powered by a different supply voltage or monitor multiple
supplies that will be fed into 1 μC/μP reset input.
zero, and
RESET goes low. The internal timer starts after
V CC returns above the reset threshold, and
low for the reset timeout period.
RESET remains
When V CC falls below 1V, the APX803
RESET output no
longer sinks current — it becomes an open circuit. Therefore,
high-impedance CMOS logic inputs connected to RESET can
Block Diagram
RESET
V REF
Delay Circuit
Driver
/ RESET
APX803 Rev. 1
Document number: DS32132 Rev. 1 – 2
5 of 10
MARCH 2010
? Diodes Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| APX803-23SR | 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:er3-PIN MICROPROCESSOR RESET CIRCUIT |
| APX803-23SRG-7 | 功能描述:监控电路 LINEAR REGULATOR VOLT SPVSR,2.25V 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 |
| APX803-26SA | 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:er3-PIN MICROPROCESSOR RESET CIRCUIT |
| APX803-26SAG-7 | 功能描述:监控电路 LINEAR REGULATOR VOLT SPVSR,2.63V 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 |
| APX803-26SR | 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:er3-PIN MICROPROCESSOR RESET CIRCUIT |
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