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| 型号： | MAX16057ATT42+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/17页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR P-P 4.2V 6-TDFN |
| 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： | 可调节/可选择 |
| 电压 - 阀值： | 4.2V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-WDFN 裸露焊盘 |
| 供应商设备封装： | 6-TDFN 裸露焊盘（3x3） |
| 包装： | 带卷 (TR) |
MAX16056–MAX16059
125nA Supervisory Circuits with Capacitor-
Adjustable Reset and Watchdog Timeouts
Applications Information
Selecting the Reset Timeout Capacitor
The reset timeout period is adjustable to accommodate
a variety of μP applications. To adjust the reset timeout
period (t RP ), connect a capacitor (C SRT ) between SRT
and ground. The reset timeout capacitor is calculated
as follows:
C SRT = t RP /(5.15 x 10 6 )
with t RP in seconds and C SRT in Farads.
C SRT must be a low-leakage (< 10nA) type capacitor. A
ceramic capacitor with low temperature coefficient
dielectric (i.e., X7R) is recommended.
Selecting Watchdog Timeout Capacitor
The watchdog timeout period is adjustable to accom-
modate a variety of μP applications. With this feature,
the watchdog timeout can be optimized for software
execution. The programmer can determine how often
the watchdog timer should be serviced. Adjust the
watchdog timeout period (t WD ) by connecting a capaci-
tor (C SWT ) between SWT and GND. For normal mode
operation, calculate the watchdog timeout as follows:
t WD = Floor[C SWT x 5.15 x 10 6 /6.4ms] x 6.4ms + 3.2ms
with t WD in seconds and C SWT in Farads.
(Floor: take the integral value) (Figures 2 and 3)
The maximum t WD is 296s. If the capacitor sets t WD
greater than the 296s, t WD = infinite and the watchdog
timer is disabled.
C SWT must be a low-leakage (< 10nA) type capacitor.
A ceramic capacitor with low temperature coefficient
dielectric (i.e., X7R) is recommended.
Watchdog Timeout Accuracy
The watchdog timeout period is affected by the SWT
ramp current (I RAMP2 ) accuracy, the SWT ramp thresh-
old (V RAMP2 ) and the watchdog timeout clock period
(t WDPER ). In the equation above, the constant 5.15 x
10 6 is equal to V RAMP2 /I RAMP2 , and 6.4ms equals the
watchdog timeout clock period. Calculate the timeout
Maxim Integrated
accuracy by substituting the minimum, typical, and
maximum values into the equation.
For example, if C SWT = 100nF.
t WDMIN = Floor[100 x 10 -9 x 1.173/(282 x 10 -9 )/9.5ms] x
3.5ms + 0.5 x 3.2ms = 141.7ms
t WDNOM = Floor[100 x 10 -9 x 1.235/(240 x 10 -9 )/6.4ms]
x 6.4ms + 0.5 x 6.4ms = 515.2ms
t WDMAX = Floor[100 x 10 -9 x 1.297/(197 x 10 -9 )/3.5ms]
x 9.5ms + 0.5 x 9.5ms = 1790.75ms
Transient Immunity
For applications with higher slew rates on V CC during
power-up, additional bypass capacitance may be
required.
The MAX16056–MAX16059 are relatively immune to
short-duration supply voltage transients, or glitches on
V CC . The Maximum V CC Transient Duration vs. Reset
Threshold Overdrive graph in the Typical Operating
Characteristics shows this transient immunity. The area
below the curve of the graph is the region where these
devices typically do not generate a reset pulse. This
graph was generated using a falling pulse applied to
V CC , starting 100mV above the actual reset threshold
(V TH ) and ending below this threshold (reset threshold
overdrive). As the magnitude of the transient increases,
the maximum allowable pulse width decreases.
Typically, a 100mV V CC transient duration of 40μs or
less does not cause a reset.
Using the MAX16056–MAX16059 for
Reducing System Power Consumption
Using the RESET output to control an external p-channel
MOSFET to control the on-time of a power supply can
result in lower system power consumption in systems that
can be regularly put to sleep. By tying the WDI input to
ground, the RESET output becomes a low-frequency
clock output. When RESET is low, the MOSFET is turned
on and power is applied to the system. When RESET is
high, the MOSFET is turned off and no power is con-
sumed by the system. This effectively reduces the shut-
down current of the system to zero (Figure 4).
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16057ATT43+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX16057ATT43+T | 功能描述:监控电路 NanoPwr w/Cap-Adj Reset and Watchdog 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 |
| MAX16057ATT44+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX16057ATT44+T | 功能描述:监控电路 NanoPwr w/Cap-Adj Reset and Watchdog 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 |
| MAX16057ATT45+T | 功能描述:监控电路 NanoPwr w/Cap-Adj Reset and Watchdog 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 |
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