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| 型号： | MAX795SCSA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/20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
V IN
V IN
R1
PFI
V CC
MAX793
R1
PFI
V CC
MAX793
R2
R3
MAX794
R2
R3
MAX794
C1*
C1*
PFO
GND
PFO
GND
PFO
TO μ P
*OPTIONAL
PFO
TO μ P
*OPTIONAL
0V
0V
V L
V TRIP
V H
V IN
0V
0V
V TRIP
V H
V IN
( R1 R2 + R2 )
V TRIP = V PFT
V H = (V PFT + V PFH ) (R1)
(
1
R1
+
1
R2
+
1
R3
)
WHERE V PFT = 1.237V
V PFH = 10mV
V TRIP = V PFT ( R1 + R2 R2 )
V H = R1 (V PFT + V PFH )
( R11 + R21 + R31 ) –
V D
R3
(a)
V L = R1 V PFT
(
1
R1
+
1
R2
+
1
R3
)
–
V CC
R3
(b)
WHERE V PFT = 1.237V
V PFH = 10mV
V D = DIODE FORWARD VOLTAGE DROP
V L = V TRIP
Figure 16. Adding Hysteresis to the Power-Fail Comparator: (a) Symmetrical Hysteresis, (b) Hysteresis Only on Rising V IN
Monitoring an Additional Power Supply
These μP supervisors can monitor either positive or
negative supplies using a resistor voltage divider to
PFI. PFO can be used to generate an interrupt to the μP
or to cause reset to assert (Figure 12).
V CC
Interfacing to μPs with
Bidirectional Reset Pins
Since the RESET output is open drain, the MAX793/
V CC
RESET
V CC
MAX794/MAX795 interface easily with μPs that have
bidirectional reset pins, such as the Motorola 68HC11.
Connecting the RESET output of the μP supervisor
directly to the RESET input of the microcontroller with a
single pullup resistor allows either device to assert
RESET
GENERATOR
N
RESET
μ P
reset (Figure 17).
Negative-Going V CC Transients
These supervisors are relatively immune to short-dura-
tion negative-going V CC transients (glitches) while issu-
MAX793
MAX794
MAX795
ing resets to the μP during power-up, power-down, and
GND
GND
brownout conditions. Therefore, resetting the μP when
V CC experiences only small glitches is usually not rec-
ommended.
Figure 17. Interfacing to μPs with Bidirectional Reset I/O
______________________________________________________________________________________
17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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