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参数资料
| 型号： | MAX16021PTER+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/21页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR OD 2.640V 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： | 2.64V |
| 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
Adding Hysteresis to PFI
The power-fail comparators have a typical input hys-
teresis of V PFT-HYS . This is sufficient for most applica-
tions where a power-supply line is being monitored
through an external voltage-divider (see the Monitoring
an Additional Supply section). Figure 4 shows how to
add hysteresis to the power-fail comparator. Select the
ratio of R1 and R2 so that PFI sees V PFT when V IN falls
to the desired trip point (V TRIP ). Resistor R3 adds hys-
teresis. R3 is typically an order of magnitude greater
than R1 or R2. R3 should be larger than 50k ? to pre-
vent it from loading down PFO . Capacitor C1 adds
additional noise rejection.
Battery-On Indicator (Push-Pull Version)
BATTON goes high when in battery-backup mode. Use
BATTON to indicate battery-switchover status or to sup-
ply base drive to an external pass transistor for higher
current applications (Figure 5).
Operation Without a Backup Power Source
The MAX16016/MAX16020/MAX16021 provide a bat-
tery-backup function. If a backup power source is not
used, connect BATT to GND and OUT to V CC .
V IN
+5V
0.1 μ F
V CC
0.1 μ F
1 μ F
R1
V CC
PFI
V CC
BATTON
OUT
R2
C1*
R3
MAX16016L
BATT
CEOUT
CE
TO μ P
PFO
MAX16020L
MAX16021L
MR
MAX16020L
CEIN
ADDRESS
DECODE
CMOS RAM
A0–A15
μ P
*OPTIONAL
GND
RESET
RESET
(—)
V TRIP = V PFT x
R1+R2
R2
GND
) x (– + – + 1 )
V H = (V PFT +V PFT-HYS
V = R1 x (—
+ —) + V
R2
R3
PFO
+5V
0
R1 R1
R2 R3
V PFT V CC -V PFT
L PFT
WHERE V PFT IS THE POWER-FAIL THRESHOLD VOLTAGE
Figure 5. BATTON Driving an External Pass Transistor
V L
V TRIP
V H
V IN
Figure 4. Adding Hysteresis to the Power-Fail Comparator
______________________________________________________________________________________
17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| MAX16021PTET+T | 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 |
| MAX16021PTEV+ | 功能描述:监控电路 uPwr w/Bat-Backup 1.571V 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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