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| 型号： | MAX16057ATT45+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/17页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR P-P 4.5V 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： | 4.5V |
| 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
Detailed Description
The MAX16056–MAX16059 are ultra-low-current 125nA
(typ) μP supervisory circuits that monitor a single sys-
tem supply voltage. These devices assert an active-low
reset signal whenever the V CC supply voltage drops
below the factory-trimmed reset threshold, manual
reset is pulled low, or the watchdog timer runs out
(MAX16056/MAX16058). The reset output remains
asserted for an adjustable reset timeout period after
V CC rises above the reset threshold. The reset and
watchdog delay periods are adjustable using external
capacitors.
RESET Output
The MAX16056–MAX16059 μP supervisory circuits assert
a reset to prevent code-execution errors during power-
up, power-down, and brownout conditions. The reset
output is guaranteed to be valid for V CC down to 1.1V.
When V CC falls below the reset threshold, the RESET
output asserts low. Once V CC exceeds the reset thresh-
old plus the hysteresis, an internal timer keeps the reset
output asserted for the capacitor-adjusted reset timeout
period (t RP ), then after this interval the reset output
deasserts (see Figure 1). The reset function features
immunity to power-supply voltage transients.
Manual-Reset Input ( MR )
Many μP-based products require manual-reset capabil-
ity, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. The MAX16056 –
MAX16059 feature an MR input. A logic-low on MR
asserts a reset. RESET remains asserted while MR is
low and for the timeout period, t RP , after MR returns
high. Connect MR to V CC if unused. MR can be driven
with CMOS logic levels or with open-drain/collector out-
puts (with a pullup resistor). Connect a normally open
momentary switch from MR to GND and a resistor from
MR to V CC to implement a manual-reset function; exter-
nal debounce circuitry is not required. If MR is driven
by long cables or the device is used in a noisy environ-
ment, connect a 0.1μF capacitor from MR to GND to
provide additional noise immunity.
Maxim Integrated
Watchdog Timer
The MAX16056/MAX16058’s watchdog timer circuitry
monitors the μP’s activity. If the μP does not toggle
(high-to-low) the watchdog input (WDI) within the
capacitor-adjustable watchdog timeout period (t WD ),
RESET asserts for the reset timeout period (t RP ). The
internal watchdog timer is cleared by: 1) any event that
asserts RESET , by 2) a falling transition at WDI (that
can detect pulses as short as 150ns) or by 3) a transi-
tion (high-to-low or low-to-high) at WDS. While reset is
asserted, the watchdog timer remains cleared and
does not count. As soon as reset deasserts, the watch-
dog timer resumes counting.
There are two modes of watchdog operation, normal
mode and extended mode. In normal mode (Figure 2),
the watchdog timeout period is determined by the
value of the capacitor connected between SWT and
ground. In extended mode (Figure 3), the watchdog
timeout period is multiplied by 128. For example, in
extended mode, a 0.33μF capacitor gives a watchdog
timeout period of 217s (see Table 2). To disable the
watchdog timer function, connect SWT to ground.
When V CC ramps above V TH + V HYST , the value of the
external SWT capacitor is sampled after RESET goes
high. When sampling is finished, the capacitor value is
stored in the device and is used to set watchdog time-
out. If RESET goes low before sampling is finished, the
device interrupts sampling, and sampling is restarted
when RESET goes high again.
If the external SWT capacitor is less than 470pF, the
sampling result sets the watchdog timeout to zero. This
causes the watchdog to assert RESET continuously
after sampling is finished. If a PCB manufacturing
defect caused the connection to C SWT to be broken,
the capacitance is very low and RESET is continuously
asserted. If the external SWT capacitor is greater than
0.47μF, the sampling result sets the watchdog timeout
to be infinite, disabling the watchdog function.
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16057ATT46+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 |
| MAX16058ATA16+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 |
| MAX16058ATA17+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 |
| MAX16058ATA18+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 |
| MAX16058ATA19+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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