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| 型号： | MAX808NESA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/12页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 备用电池电路 |
| 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： | 4.575V |
| 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) |
8-Pin μP Supervisory Circuits
with ±1.5% Reset Accuracy
V RST (max)
+5V
V CC
MAX808
1N4148
BATT
V CC
OUT
50 Ω DRIVER
CE IN
CE OUT
50pF C LOAD
0.47F
MAX801
MAX808
GND
Figure 7. MAX808 CE Gate Test Circuit
Chip-Enable Output
In enabled mode, CE OUT’s impedance is equivalent to
75 Ω in series with the source driving CE IN. In disabled
mode, the 75 Ω transmission gate is off and CE OUT is
actively pulled to the higher of V CC or V BATT . The
source turns off when the transmission gate is enabled.
__________Applications Information
The MAX801/MAX808 are not short-circuit protected.
Shorting OUT to ground, other than power-up transients
such as charging a decoupling capacitor, may destroy
the device. If long leads connect to the IC’s inputs,
ensure that these lines are free from ringing and other
conditions that would forward bias the IC’s protection
diodes. Bypass OUT, V CC , and BATT with 0.1μF
capacitors to GND.
The MAX801/MAX808 operate in two distinct modes:
1) Normal Operating Mode, with all circuitry powered
up. Typical supply current from V CC is 68μA (48μA
for the MAX808), while only leakage currents flow
from the battery.
2) Battery-Backup Mode, where V CC is below V BATT
and V RST . The supply current from the battery is typ-
ically less than 1μA.
Using SuperCaps? or MaxCaps?
with the MAX801/MAX808
BATT has the same operating voltage range as V CC , and
the battery-switchover threshold voltage is typically
V BATT when V CC is decreasing or V BATT + 0.05V when
V CC is increasing. This hysteresis allows use of a
SuperCap (e.g., around 0.47F) and a simple charging
GND
Figure 8. Using the MAX801/MAX808 with a SuperCap
circuit as a backup source (Figure 8). Since V BATT can
exceed V CC while V CC is above the reset threshold, no
special precautions are needed when using these μP
supervisors with a SuperCap.
Backup-Battery Replacement
The backup battery can be disconnected while V CC is
above the reset threshold, provided BATT is bypassed
with a 0.1μF capacitor to ground. No precautions are
necessary to avoid spurious reset pulses.
Negative-Going V CC Transients
While issuing resets to the μP during power-up, power-
down, and brownout conditions, these supervisors are
relatively immune to short-duration, negative-going V CC
transients (glitches). It is usually undesirable to reset
the μP when V CC experiences only small glitches.
The Typical Operating Characteristics show a graph of
Maximum Transient Duration vs. Reset Threshold
Overdrive, for which reset pulses are not generated.
The graph was produced using negative-going V CC
pulses, starting at 5V and ending below the reset
threshold by the magnitude indicated (reset compara-
tor overdrive). The graph shows the maximum pulse
width that a negative-going V CC transient may typically
have without causing a reset pulse to be issued. As the
amplitude of the transient increases (i.e., goes farther
below the reset threshold), the maximum allowable
pulse width decreases. Typically, a V CC transient that
goes 40mV below the reset threshold and lasts for 3μs
or less will not cause a reset pulse to be issued. A
0.1μF bypass capacitor mounted close to the V CC pin
provides additional transient immunity.
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX808NMJA | 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 |
| MAX809 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Very Low Supply Current 3-Pin Microprocessor Reset Monitors |
| MAX809_10 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Very Low Supply Current 3-Pin Microprocessor Reset Monitors |
| MAX809_EUR+T | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:3-Pin Microprocessor Reset Circuits |
| MAX809_EUR-T | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:3-Pin Microprocessor Reset Circuits |
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