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| 型号： | MAX6886ETP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/13页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR HEX 20-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 多压监控器 |
| 监视电压数目： | 6 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 可调节/可选择 |
| 电压 - 阀值： | 6 种可选阀值组合 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WQFN 裸露焊盘 |
| 供应商设备封装： | 20-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
Pin-Selectable, Hex Power-Supply
Supervisory Circuit
Margin Output Disable ( MARGIN )
MARGIN allows system-level testing while power sup-
plies exceed the normal operating ranges. Drive
Connect a capacitor from SWT to GND to determine the
normal watchdog timeout period according to the fol-
lowing equation:
MARGIN low to hold RESET in its existing state while
system-level testing occurs. Leave MARGIN uncon-
nected or connect to DBP if unused. An internal 10μA
current source pulls MARGIN to DBP. MARGIN over-
C SWT =
t WD
4 . 348 x 10 6
rides MR if both are asserted at the same time.
Watchdog Timer
The MAX6886 ’s watchdog circuit monitors the μP ’s
activity. If the μP does not toggle the watchdog input
(WDI) within the watchdog timeout period, RESET
asserts. The internal watchdog timer is cleared by a
reset, or by a transition at WDI (which can detect puls-
es as short as 50ns.) The watchdog timer remains
cleared while RESET is asserted. The timer starts
counting as soon as RESET goes high (see Figure 2).
The MAX6886 features two modes of watchdog timer
operation: normal and initial modes. At power-up, after a
reset event, or after the watchdog timer expires, the ini-
tial watchdog timeout is active (t WDI ). After the first tran-
sition on WDI, the normal watchdog timeout is active
(t WD ). The initial and normal watchdog timeouts are
determined by the value of the capacitor connected
between SWT and ground. The initial watchdog timeout
is approximately 64 times the normal watchdog timeout.
2.5V
V CC OR IN1–IN4
RESET
WDI
where t WD is in seconds and C SWT is in Farads. As an
example, a 1μF capacitor gives a normal timeout peri-
od of 4.68s and an initial watchdog timeout period of
approximately 4.5 minutes. Connect SWT to V CC to use
the factory-default watchdog normal and initial timeouts
of 1.6s and 102.4s, respectively. Choose a low-leakage
capacitor for C SWT . Disable the watchdog timer by
connecting SWT to GND. WDI is internally pulled down
to GND through a 10μA current sink.
RESET Output
The reset output is typically connected to the reset
input of a μP. A μP’s reset input starts or restarts the μP
in a known state. RESET goes low whenever one or
more input voltage (IN1–IN6) monitors drop below their
respective thresholds, when MR is pulled low for a mini-
mum of 1μs, or when the watchdog timer expires.
RESET remains low for its reset timeout period (t RP )
after all assertion-causing conditions have been
cleared (see Figure 2).
t D-PO
t RP
*t WDI
t WD
t RP
*t WDI
*t WDI IS THE INITIAL WATCHDOG TIMER PERIOD.
Figure 2. Watchdog, Reset, and Power-Up Timing Diagram
______________________________________________________________________________________
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6887AETE | 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 |
| MAX6887AETE+ | 功能描述:监控电路 Hex Power-Supply Supervisor 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 |
| MAX6887AETE+T | 功能描述:监控电路 Hex Power-Supply Supervisor 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 |
| MAX6887AETE-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 |
| MAX6887BETE | 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 |
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