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参数资料
| 型号： | MAX807MEUE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU 16TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 96 |
| 类型： | 备用电池电路 |
| 监视电压数目： | 1 |
| 复位： | 高有效/低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 4.575V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 管件 |
Full-Featured μP Supervisory Circuit with
±1.5% Reset Accuracy
MR
RESET
CE IN
0V
CE OUT
Figure 4. Manual-Reset Timing Diagram
1 μ s MIN
170ns
28 μ s TYP
Chip-Enable Signal Gating
The MAX807 provides internal gating of chip-enable
(CE) signals to prevent erroneous data from corrupting
the CMOS RAM in the event of a power failure. During
normal operation, the CE gate is enabled and passes
all CE transitions. When reset is asserted, this path
becomes disabled, preventing erroneous data from
corrupting the CMOS RAM. The MAX807 uses a series
transmission gate from the Chip-Enable Input (CE IN) to
the Chip-Enable Output (CE OUT) (Figure 1).
The 8ns (max) chip-enable propagation from CE IN to
CE OUT enables the MAX807 to be used with most μPs.
Chip-Enable Input
Watchdog Output
WDO remains high if there is a transition or pulse at
WDI during the watchdog-timeout period. WDO goes
low if no transition occurs at WDI during the watchdog-
timeout period. The watchdog function is disabled and
WDO is a logic high when V CC is below the reset
threshold or WDI is an open circuit. To generate a sys-
tem reset on every watchdog fault, diode-OR connect
WDO to MR (Figure 6). When a watchdog fault occurs
in this mode, WDO goes low, which pulls MR low, caus-
ing a reset pulse to be issued. As soon as reset is
asserted, the watchdog timer clears and WDO returns
high. With WDO connected to MR, a continuous high or
low on WDI will cause 200ms reset pulses to be issued
every 1.6s.
V RST
CE IN is high impedance (disabled mode) while RESET
is asserted. During a power-down sequence when V CC
passes the reset threshold, the CE transmission gate
disables and CE IN becomes high impedance 28μs
after reset is asserted (Figure 7). During a power-up
sequence, CE IN remains high impedance (regardless
of CE IN activity) until reset is deasserted following the
reset-timeout period.
In the high-impedance mode, the leakage currents into
this input are ±1μA (max) over temperature. In the low-
impedance mode, the impedance of CE IN appears as
a 75 ? resistor in series with the load at CE OUT.
The propagation delay through the CE transmission
gate depends on both the source impedance of the
drive to CE IN and the capacitive loading on CE OUT
V CC
V CC
MAX807
4.7k ?
RESET
t RP
WDO
RESET
TO μ P
MR
WDO
V CC
WDI
t WD
WDO
～ 50 μ s
RESET
t RP
t WD
t RP
WDI
WDO CONNECTED TO μ P INTERRUPT.
Figure 5. Watchdog Timing Relationship
Figure 6. Generating a Reset on Each Watchdog Fault
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX807MEUE+ | 功能描述:监控电路 Full-Featured uPower 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 |
| MAX807MEUE+T | 功能描述:监控电路 Full-Featured uPower 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 |
| MAX807MEUE-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 |
| MAX807MEWE | 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 |
| MAX807MEWE+ | 功能描述:监控电路 Full-Featured uPower 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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