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参数资料
| 型号： | MAX817MEPA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU 5V 8-DIP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 类型： | 备用电池电路 |
| 监视电压数目： | 1 |
| 复位： | 低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 4.4V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-PDIP |
| 包装： | 管件 |
+5V Microprocessor Supervisory Circuits
Any time a reset is generated, the CE transmission gate
remains disabled and CE IN remains high impedance
(regardless of CE IN activity) for the reset timeout peri-
od. When the CE transmission gate is enabled, the
impedance of CE IN appears as a 40 ? resistor in series
with the load at CE OUT. The propagation delay
through the CE transmission gate depends on V CC , the
source impedance of the drive connected to CE IN,
and the loading on CE OUT (see Typical Operating
Characteristics ). The CE propagation delay is produc-
tion tested from the 50% point on CE IN to the 50%
point on CE OUT using a 50 ? driver and a 50pF load
capacitance (Figure 7). For minimum propagation
delay, minimize the capacitive load at CE OUT and use
a low-output-impedance driver.
Chip-Enable Output (MAX818)
When the CE transmission gate is enabled, the imped-
ance of CE OUT is equivalent to a 40 ? resistor in series
with the source driving CE IN. In the disabled mode,
the transmission gate is off and an active pull-up con-
nects CE OUT to OUT (Figure 5). This pull-up turns off
when the transmission gate is enabled.
Power-Fail Comparator
(MAX817/MAX819)
The MAX817/MAX819 PFI input is compared to an inter-
nal reference. If PFI is less than the power-fail threshold
(V PFT ), PFO goes low. The power-fail comparator is
intended for use as an undervoltage detector to signal a
failing power supply (Figure 8). However, the comparator
does not need to be dedicated to this function because it
is completely separate from the rest of the circuitry.
The power-fail comparator turns off and PFO goes low
when V CC falls below V BATT . During the reset timeout
period (t RP ), PFO is forced high, regardless of the state
of V PFI (see Battery Freshness Seal section). If the com-
parator is unused, connect PFI to ground and leave PFO
unconnected. PFO can be connected to MR on the
MAX819 so that a low voltage on PFI will generate a
reset (Figure 9). 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 t RP (200ms) after
PFO pulls MR high when the monitored supply is above
the programmed threshold. When PFO is connected to
MR , it is not possible to enable the battery freshness
seal. Enabling the battery freshness seal requires MR to
be high or open. Once the battery freshness seal is
enabled, it is no longer affected by PFO ’s connection to
MR .
+5V
V IN
+5V
REGULATOR
POWER-FAIL-WARNING TRIP VOLTAGE
BATT
V CC
V WARN = 1.25
(
R1 + R 2
R2
)
MAX818
V CC
50 ?
50 ?
CE IN
GND
CE OUT
50pF
R1
PFI
MAX817
MAX819
RESET
RESET
C L *
PFO
NMI
μ P
R2
1.25V
* C L INCLUDES LOAD CAPACITANCE, STRAY CAPACITANCE,
AND SCOPE-PROBE CAPACITANCE.
Figure 7. CE Propagation Delay Test Circuit
Figure 8. Using the Power-Fail Comparator to Generate a
Power-Fail Warning
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX817MEPA+ | 功能描述:监控电路 5V 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 |
| MAX817MESA | 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 |
| MAX817MESA+ | 功能描述:监控电路 5V 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 |
| MAX817MESA+T | 功能描述:监控电路 5V 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 |
| MAX817MESA-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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