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| 型号： | MAX795SCSA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/20页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 备用电池电路 |
| 监视电压数目： | 1 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 2.925V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
3.0V/3.3V Adjustable Microprocessor
Supervisory Circuits
3.6V
BATT
V CC
V CC
In most battery-operated portable systems, reserve
energy in the battery provides ample time to complete
the shutdown routine once the low-line warning is
encountered and before reset asserts. If the system
must also contend with a more rapid V CC fall time, such
25 ? EQUIVALENT
SOURCE IMPEDANCE
50 ? CABLE
MAX793
MAX794
MAX795
as when the main battery is disconnected or a high-
side switch is opened during normal operation, use
capacitance on the V CC line to provide time to execute
the shutdown routine (Figure 11).
50 ?
50 ?
CE IN
CE OUT
50pF
C L *
First, calculate the worst-case time required for the sys-
tem to perform its shutdown routine. Then, with the worst-
case shutdown time, the worst-case load current, and the
minimum low-line to reset threshold (V LR min), calculate
GND
*C L INCLUDES LOAD CAPACITANCE AND SCOPE PROBE CAPACITANCE.
Figure 9. CE Propagation Delay Test Circuit
10). If there is no easy access to the unregulated sup-
ply, the LOWLINE output can be used to generate an
NMI to the μP (see LOWLINE Output section).
L O W L I N E Output (MAX793/MAX794)
The low-line comparator monitors V CC with a threshold
voltage typically 45mV above the reset threshold (10mV
of hysteresis) for the MAX793, and 15mV above RESET
IN (4mV of hysteresis) for the MAX794. For normal
operation (V CC above the reset threshold), LOWLINE is
pulled to V CC . Use LOWLINE to provide an NMI to the
μP when power begins to fall.
UNREGULATED
the amount of capacitance required to allow the shut-
down routine to complete before reset is asserted:
C HOLD > I LOAD x t SHDN / V LR
where I LOAD is the current being drained from the
capacitor, V LR is the low-line to reset threshold differ-
ence (V LL - V RST ), and t SHDN is the time required for
the system to complete an orderly shutdown routine.
Power-Fail Comparator (MAX793/MAX794)
The MAX793/MAX794’s PFI input is compared to an
internal reference. If PFI is less than the power-fail
threshold (V PFT ), PFO goes low. The power-fail com-
parator is intended for use as an undervoltage detector
to signal a failing power supply (Figure 12). However,
the comparator does not need to be dedicated to this
function because it is completely separate from the rest
of the circuitry.
SUPPLY
REGULATOR
3.0V OR 3.3V
REGULATOR
3.0V OR 3.3V
V CC
LOWLINE
TO μ P NMI
V CC
C HOLD
R1
PFI
MAX793
MAX794
PFO
TO μ P NMI
C HOLD > I LOAD x t SHDN
MAX793
MAX794
R2
GND
V LR
GND
Figure 10. Using the Power-Fail Comparator to Generate
Power-Fail Warning
Figure 11. Using LOWLINE to Provide Power-Fail Warning
to the μP
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| MAX795SEPA | 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 |
| MAX795SEPA+ | 功能描述:监控电路 3/3.3/AdjV MPU 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 |
| MAX795SESA | 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 |
| MAX795SESA+ | 功能描述:监控电路 3/3.3/AdjV MPU 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 |
| MAX795SESA+T | 功能描述:监控电路 3/3.3/AdjV MPU 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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