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| 型号： | MAX803SQ308D2T1G |
| 厂商： | ON Semiconductor |
| 文件页数： | 7/10页 |
| 文件大小： | 0K |
| 描述： | IC MPU RESET MON 3.08V SOT-323 |
| 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： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 最小为 20 ms |
| 电压 - 阀值： | 3.08V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-70，SOT-323 |
| 供应商设备封装： | SC-70-3（SOT323） |
| 包装： | 带卷 (TR) |
MAX803 Series, NCP803 Series
APPLICATIONS INFORMATION
V CC Transient Rejection
The MAX803/NCP803 series provides accurate V CC
monitoring and reset timing during power ? up,
power ? down, and brownout/sag conditions, and rejects
negative ? going transients (glitches) on the power supply
line. Figure 13 shows the maximum transient duration vs.
maximum negative excursion (overdrive) for glitch
rejection. Any combination of duration and overdrive which
lies under the curve will not generate a reset signal.
Combinations above the curve are detected as a brownout or
power ? down. Typically, transient that goes 100 mV below
the NCP803/MAX803 has Open ? Drain and active ? low
output, it typically uses a pullup resistor. With this device,
RESET will most likely not maintain an active condition,
but will drift to a non ? active level due to the pullup resistor
and the reduced sinking capability of the open ? drain device.
Therefore, this device is not recommended for applications
where the RESET pin is required to be valid down to
V CC = 0 V.
V CC
the reset threshold and lasts 5.0 m s or less will not cause a
reset pulse. Transient immunity can be improved by adding
a capacitor in close proximity to the V CC pin of the
MAX803.
V CC
V TH
V CC
MAX809
NCP803
RESET
GND
R1
100 k*
Overdrive
*Assume High ? Z Reset Input to Microprocessor
Figure 14. RESET Signal Integrity
Duration
MAX803 RESET Output Allows Use With Two Power
250
200
150
Supplies
In numerous applications the pullup resistor place on the
RESET output is connected to the supply voltage monitored
by the IC. Nevertheless, a different supply voltage can also
power this output and so level ? shift from the monitored
supply to reset the microprocessor. However, if the
100
50
V TH = 4.63 V
V TH = 1.2 V
NCP803/MAX803’s supply goes blew 1 V, the RESET
output ability to sink current will decrease and the result is
a high state on the pin even though the supply’s IC is under
the threshold level. This occurs at a V CC level that depends
on the R pullup value and the voltage which is connected.
0
10
60
110
160
210
260
310
360 410
V CC1
V CC2
RESET COMPARATOR OVERDRIVE (mV)
Figure 13. Maximum Transient Duration vs.
Overdrive for Glitch Rejection at 25 ° C
RESET Signal Integrity During Power ? Down
The MAX803/NCP803 RESET output is valid to V CC =
1.0 V. Below this voltage the output becomes an “open
V CC
MAX803
NCP803
RESET
GND
R pullup
V CC
Microprocessor
RESET
GND
circuit” and does not sink current. This means CMOS logic
inputs to the Microprocessor will be floating at an
undetermined voltage. Most digital systems are completely
shutdown well above this voltage. However, in situations
where RESET must be maintained valid to V CC = 0 V, since
Figure 15. MAX803 RESET Output with Two Supplies
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX803SQ308T1G | 功能描述:监控电路 ANA 3.08V MC RESET 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 |
| MAX803SQ438T1G | 功能描述:监控电路 ANA 4.38V MC RESET 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 |
| MAX803SQ463T1G | 功能描述:监控电路 ANA 4.63V MC RESET 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 |
| MAX803T | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:3-Pin Microprocessor Reset Circuits |
| MAX803TEXR | 制造商:Maxim Integrated Products 功能描述:3 PIN SC70 MICROPROCESSOR RESET CIRCUIT. - Rail/Tube |
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