- 您现在的位置：买卖IC网 > PDF目录15442 > SP813LCN-L (Exar Corporation)IC MPU SUPERVISORY CIRC 8NSOIC PDF资料下载
参数资料
| 型号： | SP813LCN-L |
| 厂商： | Exar Corporation |
| 文件页数： | 11/17页 |
| 文件大小： | 0K |
| 描述： | IC MPU SUPERVISORY CIRC 8NSOIC |
| 标准包装： | 98 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 复位： | 高有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 4.65V |
| 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-SOICN |
| 包装： | 管件 |
| 其它名称： | SP813LCN-L-ND |
S P 7 0 5 - S P 7 0 8 - S P 8 1 3 L
L o w P o w e r M i c r o p r o c e s s o r S u p e r v i s o r y C i r c u i t s
M ONITORING V OLTAGES O THER THAN THE
U NREGULATED DC I NPUT
Monitor voltages other than the unregulated
DC by connecting a voltage divider to PFI and
adjusting the ratio appropriately. If required,
add hysteresis by connecting a resistor (with a
the SP705-708/813L will keep RESET asserted
(where RESET = LOW and RESET = HIGH).
Note that this circuit's accuracy depends on
the PFI threshold tolerance, the V CC line, and
the resistors.
value approximately 10 times the sum of the
two resistors in the potential divider network)
between PFI and PFO . A capacitor between PFI
and GND will reduce the power-fail circuit's
sensitivity to high-frequency noise on the line
being monitored. RESET can be used to
monitor voltages other than the +5V V CC line.
Connect PFO to MR to initiate a RESET pulse
when PFI drops below 1.25V. Figure 21 shows
the SP705/706/707/708 configured to assert
RESET when the +5V supply falls below the
RESET threshold, or when the +12V supply
falls below approximately 11V.
Fig. 22: Monitoring a Negative Voltage Supply
I NTERFACING TO μ P S WITH B IDIRECTIONAL
RESET P INS
μPs with bidirectional RESET pins, such as the
Motorola 68HC11 series, can contend with the
SP705/706/707/708 RESET output. If, for
example, the RESET output is driven HIGH and
the μP wants to pull it LOW, indeterminate
logic levels may result. To correct this,
connect a 4.7K ? resistor between the RESET
output and the μP reset I/O, as shown if
Figure 23. Buffer the RESET output to other
system components.
Fig. 21: Monitoring +5V and +12V Power Supplies
M ONITORING A N EGATIVE V OLTAGE S UPPLY
The power-fail comparator can also monitor a
negative supply rail, shown in Figure 22. When
the negative rail is good (a negative voltage of
large magnitude), PFO is LOW. By adding the
resistors and transistor as shown, a HIGH PFO
triggers RESET. As long as PFO remains HIGH,
? 2010 Exar Corporation
11/17
Rev. 2.0.0
相关PDF资料 |
PDF描述 |
|---|---|
| V300C8T100BG3 | CONVERTER MOD DC/DC 8V 100W |
| VE-B7M-EY-B1 | CONVERTER MOD DC/DC 10V 50W |
| V300C8T100BG2 | CONVERTER MOD DC/DC 8V 100W |
| VE-B7L-EY-B1 | CONVERTER MOD DC/DC 28V 50W |
| VE-B74-EY-B1 | CONVERTER MOD DC/DC 48V 50W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SP813LCN-L/TR | 功能描述:监控电路 LOW PWR MICROPRCESSR CIRCUITS 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 |
| SP813LCP | 制造商:EXAR 制造商全称:EXAR 功能描述:Low Power Microprocessor Supervisory Circuits |
| SP813LCP-L | 功能描述:监控电路 LOW PWR MICROPRCESSR CIRCUITS 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 |
| SP813LCP-L/TR | 制造商:EXAR 制造商全称:EXAR 功能描述:Low Power Microprocessor Supervisory Circuits |
| SP813LCU | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Low Power Microprocessor Supervisory Circuits |
发布紧急采购，3分钟左右您将得到回复。