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| 型号： | MAX795RESA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/20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： | 100 |
| 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： | 2.625V |
| 工作温度： | -40°C ~ 85°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： | 管件 |
3.0V/3.3V Adjustable Microprocessor
Supervisory Circuits
The propagation delay through the CE transmission
gate depends on V CC , the source impedance of the
drive connected to CE IN, and the loading on CE OUT.
MAX793
MAX794
MAX795
CHIP-ENABLE
OUTPUT
CONTROL
OUT
P
The CE propagation delay is production tested from the
50% point on CE IN to the 50% point on CE OUT using
a 50 ? driver and 50pF of load capacitance (Figure 9).
For minimum propagation delay, minimize the capaci-
tive load at CE OUT and use a low-output-impedance
driver.
Chip-Enable Output
CE IN
RESET
GENERATOR
P
CE OUT
When the CE transmission gate is enabled, the imped-
ance of CE OUT is equivalent to a 46 ? resistor in series
with the source driving CE IN. In the disabled mode,
the transmission gate is off and an active pullup con-
nects CE OUT to OUT (Figure 8). This pullup turns off
N
Figure 7. Chip-Enable Transmission Gate
The CE transmission gate remains disabled and CE IN
remains high impedance (regardless of CE IN activity)
for the first half of the reset timeout period (t RP / 2), any
time a reset is generated. While disabled, CE IN is high
impedance. When the CE transmission gate is enabled,
the impedance of CE IN appears as a 46 ? resistor in
series with the load at CE OUT.
when the transmission gate is enabled.
Early Power-Fail Warning
(MAX793/MAX794)
Critical systems often require an early warning indicat-
ing that power is failing. This warning provides time for
the μP to store vital data and take care of any additional
“housekeeping ” functions, before the power supply
gets too far out of tolerance for the μP to operate reli-
ably. The MAX793/MAX794 offer two methods of
achieving this early warning. If access to the unregulat-
ed supply is feasible, the power-fail comparator input
(PFI) can be connected to the unregulated supply
through a voltage divider, with the power-fail compara-
tor output ( PFO ) providing the NMI to the μP (Figure
V RST
V RST
V RST
V RST
V CC
CE OUT
V SW
V SW
V BATT
t RP / 2
10 μ s
V BATT
V CC
t RP
RESET
(PULLED TO V CC )
CE IN
V BATT = 3.6V
RESET PULLED UP TO V CC
Figure 8. Chip-Enable Timing
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX795RESA+ | 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 |
| MAX795RESA+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 |
| MAX795RESA-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 |
| MAX795SCPA | 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 |
| MAX795SCPA+ | 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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