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参数资料
| 型号： | MAX793RCPE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/20页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU 16-DIP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 25 |
| 类型： | 备用电池电路 |
| 监视电压数目： | 1 |
| 输出： | 开路漏极，推挽式 |
| 复位： | 高有效/低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 2.625V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 16-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 16-PDIP |
| 包装： | 管件 |
3.0V/3.3V Adjustable Microprocessor
Supervisory Circuits
V CC
V RST
V SW
3.3V
to V CC , the collector to OUT, and the base to BATT ON
(Figure 14a). No current-limiting resistor is required, but
a resistor connecting the base of the PNP to BATT ON
can be used to limit the current drawn from V CC , pro-
longing battery life in portable equipment.
If you are using a PMOS transistor, however, it must be
connected backwards from the traditional method.
Connect the gate to BATT ON, the drain to V CC , and
3.6V
3.3V
3.6V
the source to OUT (Figure 14b). This method orients
the body diode from V CC to OUT and prevents the
V OUT
V BATT = 3.6V
Figure 13. Battery Switchover Timing
Table 1. Input and Output Status in
Battery-Backup Mode
backup battery from discharging through the FET when
its gate is high. Two PMOS transistors in the Siliconix
LITTLE FOOT ? series are specified with V GS down to
-2.7V. The Si9433DY has a maximum 100m ? drain-
source on-resistance with 2.7V of gate drive and a 2A
drain-source current. The Si9434DY specifies a 60m ?
drain-source on-resistance with 2.7V of gate drive and
a 5.1A drain-source current.
PIN NAME
OUT
V CC
BATT ON
BATT OK
PFI
PFO
MR
WDO
WDI
RESET
RESET
BATT
LOWLINE
CE IN
CE OUT
STATUS
Connected to BATT through an internal
140 ? switch
Disconnected from OUT
Pulled up to BATT
Logic low
Disabled
Logic low
Disabled, but still pulled up to V CC
Logic low
Disabled
Logic low
Pulled up to V CC
Connected to OUT
Logic low
High impedance
Pulled to BATT
Using a Super Cap as a Backup
Power Source
Super caps are capacitors with extremely high capaci-
tance values (e.g., order of 0.47F) for their size. Figure
15 shows two ways to use a super cap as a backup
power source. The super cap can be connected
through a diode to the 3V input (Figure 15a); or, if a 5V
supply is also available, the super cap can be charged
up to the 5V supply (Figure 15b), allowing a longer
backup period. Since V BATT can exceed V CC while
V CC is above the reset threshold, there are no special
precautions when using these μP supervisors with a
super cap.
Operation without a
Backup Power Source
These μP supervisors were designed for battery-
backed applications. If a backup battery is not used,
connect BATT, OUT, and V CC together, or use a differ-
ent μP supervisor.
__________Applications Information
These μP supervisory circuits are not short-circuit pro-
tected. Shorting V OUT to ground, excluding power-up
transients such as charging a decoupling capacitor,
destroys the device. Decouple both V CC and BATT
pins to ground by placing 0.1μF ceramic capacitors as
Replacing the Backup Battery
The backup power source can be removed while V CC
remains valid, without danger of triggering a reset
pulse, provided that BATT is decoupled with a 0.1μF
capacitor to ground. As long as V CC stays above the
reset threshold, battery-backup mode cannot be
entered.
close to the device as possible.
Driving an External Switch with BATT ON
BATT ON can be directly connected to the base of a
PNP transistor or the gate of a PMOS transistor. The
PNP connection is straightforward: connect the emitter
LITTLE FOOT is a registered trademark of Siliconix Inc.
______________________________________________________________________________________
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX793RCPE+ | 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 |
| MAX793RCSE | 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 |
| MAX793RCSE+ | 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 |
| MAX793RCSE+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 |
| MAX793RCSE-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 |
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