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| 型号： | MAX812SCUS+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/8页 |
| 文件大小： | 0K |
| 描述： | IC MPU V-MONITOR 2.93V SOT143-4 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 输出： | 推挽式，图腾柱 |
| 复位： | 高有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 2.93V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-253-4，TO-253AA |
| 供应商设备封装： | SOT-143-4 |
| 包装： | 带卷 (TR) |
4-Pin μP Voltage Monitors
with Manual Reset Input
8
7
T A = +25 ° C
6
5
4
3
2
1
0
MAX81 _L/M
MAX81 _R/S/T
V CC
MAX811
RESET
GND
R1
1
10
100
1000
RESET COMPARATOR OVERDRIVE , V TH - V CC (mV)
Figure 1. Maximum Transient Duration without Causing a
Reset Pulse vs. Comparator Overdrive
__________ Applications Information
Negative-Going V CC Transients
In addition to issuing a reset to the μP during power-up,
power-down, and brownout conditions, the MAX811/
MAX812 are relatively immune to short duration nega-
tive-going V CC transients (glitches).
Figure 1 shows typical transient durations vs. reset
comparator overdrive, for which the MAX811/MAX812
do not generate a reset pulse. This graph was generat-
ed using a negative-going pulse applied to V CC , start-
ing above the actual reset threshold and ending below
it by the magnitude indicated (reset comparator over-
drive). The graph indicates the typical maximum pulse
width a negative-going V CC transient may have without
causing a reset pulse to be issued. As the magnitude
of the transient increases (goes farther below the reset
threshold), the maximum allowable pulse width
decreases. Typically, a V CC transient that goes 125mV
below the reset threshold and lasts 40μs or less
(MAX81_L/M) or 20μs or less (MAX81_T/S/R) will not
cause a reset pulse to be issued. A 0.1μF capacitor
mounted as close as possible to V CC provides addi-
tional transient immunity.
Figure 2. RESET Valid to V CC = Ground Circuit
Ensuring a Valid RESET Output
Down to V CC = 0V
When V CC falls below 1V, the MAX811 RESET output
no longer sinks current—it becomes an open circuit.
Therefore, high-impedance CMOS-logic inputs con-
nected to the RESET output can drift to undetermined
voltages. This presents no problem in most applica-
tions, since most μP and other circuitry is inoperative
with V CC below 1V. However, in applications where the
RESET output must be valid down to 0V, adding a pull-
down resistor to the RESET pin will cause any stray
leakage currents to flow to ground, holding RESET low
(Figure 2). R1’s value is not critical; 100k Ω is large
enough not to load RESET and small enough to pull
RESET to ground.
A 100k Ω pull-up resistor to V CC is also recommended
for the MAX812 if RESET is required to remain valid for
V CC < 1V.
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX812SEUS | 制造商:Maxim Integrated Products 功能描述:4-PIN UP VOLTAGE MONITORS WITH MANU - Rail/Tube |
| MAX812SEUS+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 2.93V 2.7UA 4PIN SOT-143 - Rail/Tube |
| MAX812SEUS+T | 功能描述:监控电路 4-Pin uPower Voltage Monitor 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 |
| MAX812SEUS-T | 功能描述:监控电路 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 |
| MAX812SEUS-T+ | 制造商:Maxim Integrated Products 功能描述:Supervisory microprocessor,MAX812SEUS-T |
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