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| 型号： | MAX795RESA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/20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： | 2.625V |
| 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： | 带卷 (TR) |
3.0V/3.3V Adjustable Microprocessor
Supervisory Circuits
3.0V OR 3.3V
V IN
3.0V OR 3.3V
R1
V CC
R1
V CC
PFI
MAX793
MAX794
PFO
PFI
MAX793
MAX794
PFO
V CC
PFO
R2
V IN
GND
V CC
PFO
R2
GND
MR
V L
V TRIP
0V
V IN
V TRIP
V H
V IN
( R1 + R2 ) –
( R1 + R2 ) –
V L = R2 (V PFT )
(
)
V TRIP = V PFT
(
V H = (V PFT + V PFH )
V TRIP = R2 (V PFT + V PFH )
1 1 V CC
1 1
R1
V CC
R1
WHERE V PFT = 1.237V
V PFH = 10mV
NOTE: V TRIP, V L ARE NEGATIVE
R1 + R2
R2
R1 + R2
R2
)
(a)
(b)
Figure 12. Using the Power-Fail Comparator to Monitor an Additional Power Supply: (a) V IN Is Negative, (b) V IN Is Positive
The power-fail comparator turns off and PFO goes low
when V CC falls below V SW on power-down. During the
first half of the reset timeout period (t RP ), PFO is forced
high, irrespective of V PFI . At the beginning of the sec-
ond half of t RP , the power-fail comparator is enabled
and PFO follows PFI. If the comparator is unused, con-
nect PFI to V CC and leave PFO unconnected. PFO can
be connected to MR so that a low voltage on PFI gener-
ates a reset (Figure 12b). In this configuration, when
the monitored voltage causes PFI to fall below V PFT ,
PFO pulls MR low, causing a reset to be asserted.
Reset remains asserted as long as PFO holds MR low,
and for 200ms after PFO pulls MR high when the moni-
tored supply is above the programmed threshold.
Backup-Battery Switchover
In the event of a brownout or power failure, it may be
necessary to preserve the contents of RAM. With a
backup battery installed at BATT, the devices automati-
cally switch RAM to backup power when V CC falls. In
order to allow the backup battery (e.g., a 3.6V lithium
cell) to have a higher voltage than V CC , this family of μP
supervisors (designed for 3.3V and 3V systems) does
not always connect BATT to OUT when V BATT is
greater than V CC . BATT connects to OUT (through a
140 ? switch) either when V CC falls below V SW and
V BATT is greater than V CC , or when V CC falls below
1.75V (typ) regardless of the BATT voltage.
Switchover at V SW ensures that battery-backup mode is
entered before V OUT gets too close to the 2.0V mini-
mum required to reliably retain data in most CMOS
RAM, (switchover at higher V CC voltages would
decrease backup-battery life). When V CC recovers,
switchover is deferred either until V CC crosses V BATT if
V BATT is below V RST , or when V CC rises above the
reset threshold (V RST ) if V BATT is above V RST . This
power-up switchover technique prevents V CC from
charging the backup battery through OUT when using
an external transistor driven by BATT ON. OUT con-
nects to V CC through a 4 ? (max) PMOS power switch
when V CC crosses the reset threshold (Figure 13).
BATT ON (MAX793/MAX794)
BATT ON is high when OUT is connected to BATT.
Although BATT ON can be used as a logic output to
indicate the battery switchover status, it is most often
used as a gate or base drive for an external pass tran-
sistor for high-current applications (see Driving an
External Switch with BATT ON in the Applications
Information section). When V CC exceeds V RST on
power-up, BATT ON sinks 3.2mA at 0.4V. In battery-
backup mode, this terminal sources 100μA from BATT.
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| MAX795SCSA | 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 |
| MAX795SCSA+ | 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 |
| MAX795SCSA+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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