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参数资料
| 型号： | MAX16021PTEM+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 16/21页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR OD 4.428V 16TQFN |
| 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： | 开路漏极或开路集电极 |
| 复位： | 高有效/低有效 |
| 复位超时： | 最小 145 ms |
| 电压 - 阀值： | 4.428V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WQFN 裸露焊盘 |
| 供应商设备封装： | 16-TQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
Low-Power μP Supervisory Circuits with
Battery-Backup Circuit and Chip-Enable Gating
To reenable the freshness seal:
1) Connect a battery to BATT.
2) Bring V CC to 0V.
3) Drive MR higher than V BATT + 1.2V for at least 3μs.
4) Pull OUT to 0V.
Reset Output
A μP’s reset input starts the μP in a known state. The
μP supervisory circuits assert a reset to prevent code-
execution errors during power-up, power-down, and
brownout conditions. Reset output is guaranteed to be
a logic-low or logic-high depending on the device cho-
sen. RESET or RESET asserts when V CC is below the
reset threshold and remains asserted for at least 145ms
(t RP ) after V CC rises above the reset threshold. RESET
or RESET also asserts when MR is low. The MAX16016
watchdog function causes RESET to assert in pulses
following a watchdog timeout. The reset output is avail-
able in both push-pull and open-drain configurations.
V 1
Power-Fail Comparator
The MAX16016/MAX16020/MAX16021 offer an under-
voltage comparator that the output PFO goes low when
the voltage at PFI falls below its V PFT threshold.
Common uses for the power-fail comparator include
monitoring the power supply (such as a battery) before
any voltage regulation to provide an early power-fail
warning, so software can conduct an orderly system
shutdown. The power-fail comparator has a typical
input hysteresis of V PFT-HYS and is powered from OUT,
making it independent of the reset circuit. Connect the
PFI input to GND if not used.
Applications Information
Monitoring an Additional Supply
The MAX16016/MAX16020/MAX16021 μP supervisors
can monitor either positive or negative supplies using a
resistive voltage-divider to PFI. PFO can be used to
generate an interrupt to the μP or to trigger a reset
(Figures 2 and 3). To monitor a negative supply, con-
nect the top of the resistive divider to V CC . Connect the
bottom of the resistive divider to the negative voltage to
be monitored.
5V
0.1 μ F
V 2
0.1 μ F
R1
V CC
R1
V CC
RESET
RESET
PFI
PFO
R2
PFI
MAX16016L
μ P
R2
MAX16016
MAX16020
MAX16021
MAX16020L
MAX16021L
PFO
V-
MR
GND
— (5 - V PFT )
GND
V TRIP = V PFT -
R2
R1
ADDITIONAL SUPPLY RESET VOLTAGE
V TRIP IS NEGATIVE
(—)
V 2(RESET) = V PFT x
R1+R2
R2
PFO
+5V
0
V TRIP
Figure 2. Monitoring an Additional Supply by Connecting PFO
Figure 3. Monitoring a Negative Supply
to MR
16
______________________________________________________________________________________
0V
V-
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16021PTER+ | 功能描述:监控电路 uPwr w/Bat-Backup 2.640V 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 |
| MAX16021PTER+T | 功能描述:监控电路 uPwr w/Bat-Backup 2.640V 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 |
| MAX16021PTES+ | 功能描述:监控电路 uPwr w/Bat-Backup 2.946V 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 |
| MAX16021PTES+T | 功能描述:监控电路 uPwr w/Bat-Backup 2.946V 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 |
| MAX16021PTET+ | 功能描述:监控电路 uPwr w/Bat-Backup 3.100V 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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