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参数资料
| 型号： | MAX6727AKAZID1+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/18页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU SOT23-8 |
| 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： | 3 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 最小为 1.1 ms |
| 电压 - 阀值： | 1.388V，2.313V，可调 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-8 |
| 供应商设备封装： | SOT-23-8 |
| 包装： | 带卷 (TR) |
Dual/Triple, Ultra-Low-Voltage, SOT23 μP
Supervisory Circuits
The normal watchdog timeout period (1.12s min)
begins after the first transition on WDI before the con-
clusion of the long initial watchdog period (Figure 2).
During the normal operating mode, the supervisor will
issue a reset pulse for the reset timeout period if the μP
does not update the WDI with a valid transition (high-to-
low or low-to-high) within the standard timeout period
(1.12s min).
Leave WDI unconnected to disable the watchdog timer.
The WDI unconnected-state detector uses a small
(200nA typ) current source. Therefore, do not connect
WDI to anything that will source more than 50nA.
Power-Fail Comparator
PFI is the noninverting input to a comparator. If PFI is
less than V PFI (626.5mV), PFO goes low. Common uses
for the power-fail comparator include monitoring prereg-
Ensuring a Valid Reset Output
Down to V CC = 0V
The MAX6715A–MAX6729A/MAX6797A are guaranteed
to operate properly down to V CC = 0.8V. In applications
that require valid reset levels down to V CC = 0V, use a
pulldown resistor at RST to ground. The resistor value
used is not critical, but it must be large enough not to
load the reset output when V CC is above the reset thresh-
old. For most applications, 100k ? is adequate. This con-
figuration does not work for the open-drain outputs of the
MAX6715A/MAX6717A/MAX6719A/MAX6721A/
MAX6723A/MAX6725A/MAX6727A/MAX6728A. For push-
pull, active-high RST output connect the external resistor
as a pullup from RST to V CC 1.
A)
ulated input of the power supply (such as a battery) or
providing an early power-fail warning so software can
conduct an orderly system shutdown. It can also be
used to monitor supplies other than V CC 1 or V CC 2 by
V IN
R1
MAX6728A/
MAX6729A/
MAX6797A
V TRIP = V PFI
( R1 R2 + R2 )
setting the power-fail threshold with a resistor-divider, as
shown in Figure 3. PFI is the input to the power-fail com-
parator. The typical comparator delay is 2μs from PFI to
R2
PFI
PFO
PFO . Connect PFI to ground of V CC 1 if unused.
GND
B)
V TH
V CC
[ ( )
1 + - V CC
V TRIP = R2 (V PFI )
V CC
WDI
t WDI-NORMAL
1.12s MAX
t WDI-STARTUP
35s MAX
R1
R2
PFI
MAX6728A/
MAX6729A/
MAX6797A
PFO
V PFI = 626.5mV
R1 R2 R1
1
]
1.12s MAX
V IN
GND
RST
t RP
Figure 2. Normal Watchdog Startup Sequence
Figure 3. Using Power-Fail Input to Monitor an Additional
Power-Supply a) V IN is Positive b) V IN is Negative
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6727AKAZID2+T | 功能描述:监控电路 Triple uPower 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 |
| MAX6727AKAZID3+T | 功能描述:监控电路 Triple uPower 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 |
| MAX6727AKAZID4+T | 功能描述:监控电路 Dual/Triple Ultra-Low-Voltage SOT23 N
|
| MAX6727AKAZID5+T | 功能描述:监控电路 Triple uPower 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 |
| MAX6727AKAZID6+T | 功能描述:监控电路 Triple uPower 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 |
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