- 您现在的位置：买卖IC网 > PDF目录13355 > MAX802MCSA+T (Maxim Integrated Products)IC SUPERVISOR MPU 8-SOIC PDF资料下载
参数资料
| 型号： | MAX802MCSA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/12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： | 推挽式，图腾柱 |
| 复位： | 低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 4.4V |
| 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) |
Microprocessor Supervisory Circuits
V BATT
V CC
+5V
SW1
SW2
SW3
SW4
V CC
V OUT
TO STATIC RAM
D1
D2
MAX690A
SUBSTRATE
MAX802L
MAX690A MAX802L MAX805L
MAX692A MAX802M
D3
V BATT MAX805L RESET
(RESET)
TO μ P
+
V OUT
0.1F
GND
CONDITION
V CC > Reset Threshold
SW1/SW2
Open
SW3/SW4
Closed
V CC < Reset Threshold and
V CC > V BATT
V CC < Reset Threshold and
V CC < V BATT
Open
Closed
Closed
Open
( ) ARE FOR MAX805L ONLY.
Figure 4. Using a SuperCap as a Backup Power Source with a
RESET THRESHOLD = 4.65V IN MAX690A/MAX802L/MAX805L.
RESET THRESHOLD = 4.4V IN MAX692A/MAX802M
Figure 3. Backup-Battery Switchover Block Diagram
completely separate from the rest of the circuitry. The
external voltage divider drives PFI to sense the unregu-
lated DC input to the +5V regulator (see Typical
Operating Circuit ). The voltage-divider ratio can be
chosen such that the voltage at PFI falls below 1.25V
just before the +5V regulator drops out. PFO then trig-
gers an interrupt which signals the μP to prepare for
MAX690A/MAX802L/MAX805L and a +5V ±5% Supply
When V CC exceeds the reset threshold, it is connected to
the MAX690A/MAX692A/MAX802L/MAX802M/MAX805L
substrate, regardless of the voltage applied to V BATT
(Figure 3). During this time, the diode (D1) between V BATT
and the substrate will conduct current from V BATT to V CC if
V BATT is 0.6V or greater than V CC .
Table 1. Input and Output Status in Battery-Backup Mode
power-down.
To conserve backup-battery power, the power-fail
detector comparator is turned off and PFO is forced
low when V BATT connects to V OUT .
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 V BATT , the devices automati-
cally switch RAM to backup power when V CC fails.
As long as V CC exceeds the reset threshold, V OUT connects
to V CC through a 5 ? PMOS power switch. Once V CC falls
below the reset threshold, V CC or V BATT (whichever is high-
er) switches to V OUT . Unlike the MAX690/MAX692, the
MAX690A/MAX692A/MAX802L/MAX802M/MAX805L don’t
always connect V BATT to V OUT when V BATT is greater than
V CC . V BATT connects to V OUT (through an 80 ? switch) only
when V CC is below the reset threshold and V BATT is greater
than V CC .
SIGNAL
V CC
V OUT
V BATT
PFI
PFO
RESET
RESET
WDI
STATUS
Disconnected from V OUT
Connected to V BATT through an internal 80 ?
PMOS switch
Connected to V OUT . Current drawn from the
battery is less than 1μA, as long as
V CC < V BATT - 1V.
Power-fail comparator is disabled.
Logic low
Logic low
Logic high (MAX805L only)
Watchdog timer is disabled
_______________________________________________________________________________________
7
相关PDF资料 |
PDF描述 |
|---|---|
| V300B5C200BF | CONVERTER MOD DC/DC 5V 200W |
| VI-24V-EY-B1 | CONVERTER MOD DC/DC 5.8V 50W |
| AFK336M10B12B-F | CAP ALUM 33UF 10V 20% SMD |
| VI-2NB-EY-F1 | CONVERTER MOD DC/DC 95V 50W |
| VI-240-EY-B1 | CONVERTER MOD DC/DC 5V 50W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX802MEPA | 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 |
| MAX802MEPA+ | 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 |
| MAX802MESA | 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 |
| MAX802MESA+ | 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 |
| MAX802MESA+T | 功能描述:监控电路 NULL 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 |
发布紧急采购，3分钟左右您将得到回复。