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| 型号： | MAX6345ZUT+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/8页 |
| 文件大小： | 0K |
| 描述： | IC RESET MPU W/COMP SOT23-6 |
| 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： | 低有效 |
| 复位超时： | 最小为 100 ms |
| 电压 - 阀值： | 2.33V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 |
| 供应商设备封装： | SOT-6 |
| 包装： | 带卷 (TR) |
6-Pin μP Reset Circuit with
Power-Fail Comparator
+3.3V
+5.0V
160
140
V CC
MAX6343
RESET
10k ?
RESET
V CC
μ P
120
100
80
60
MAX634_L/M
40
20
M AX634_T/S/R/Z
GND
0
1
10
100
1000
RESET COMPARATOR OVERDRIVE, V TH - V CC (mV)
Figure 3. Open-Drain RESET Output Allows Use with Multiple
Supplies
Figure 4. Maximum Transient Duration Magnitude Rejection
V CC
V CC
100k ?
V CC
MAX6342
V CC
RESET
MAX6345
GND
RESET
GND MAX6344
100k ?
Figure 5. Ensuring RESET Valid to V CC = 0 on Active-Low
Push-Pull Outputs
Power-Fail Comparator
The power-fail comparator is useful for various purpos-
es because the power-fail output ( PFO ) is independent
of the reset output. The inverting input is internally con-
nected to a +1.25V reference.
To build an early-warning circuit for power failure, con-
nect the PFI pin to a voltage divider (see the Typical
Oper-ating Circuit ). Choose the voltage-divider ratio so
that the voltage at PFI falls below +1.25V just before the
+5V regulator drops out. Use PFO to interrupt the μP to
prepare for an orderly shutdown.
Applications Information
Negative-Going V CC Transients
The MAX6342–MAX6345 supervisors are immune to
short-duration, negative-going V CC transients (glitches)
that usually do not require the entire system to shut down.
Figure 4 shows typical transient duration vs. reset com-
parator overdrive, for which the MAX6342–MAX6345 do
not generate a reset pulse. The graph was generated
using a negative-going pulse applied to V CC , starting
MAX6345
Figure 6. Ensuring RESET Valid to V CC = 0 on Active-High
Push-Pull Outputs
0.5V above the actual reset threshold and ending below
it by the magnitude indicated (reset comparator over-
drive). The graph indicates the maximum pulse width a
negative-going V CC transient can have without causing
a reset pulse. As the magnitude of the transient increas-
es (goes further below the reset threshold), the maxi-
mum allowable pulse width decreases.
Typically, a V CC transient that goes 100mV below the
reset threshold and lasts 12μs or less will not cause a
reset pulse. A 1μF bypass capacitor mounted as close
as possible to the V CC pin provides additional transient
immunity.
Ensuring a Valid Reset Output
Down to V CC = 0
The MAX6342–MAX6345 are guaranteed to operate
properly down to V CC = +1V. In applications that require
valid reset levels down to V CC = 0, a pulldown resistor to
active-low outputs (MAX6342/MAX6345) and a pullup
resistor to active-high outputs (MAX6344/MAX6345)
ensure that the reset line is valid when the reset output is
no longer sinking or sourcing current (Figures 5 and 6).
6
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