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参数资料
| 型号： | MAX807NEPE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/16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 |
| 复位： | 高有效/低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 4.425V |
| 工作温度： | -40°C ~ 85°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 |
Full-Featured μP Supervisory Circuit with
±1.5% Reset Accuracy
Table 1. Input and Output Status in Battery-Backup Mode
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
NAME
PFI
PFO
V CC
WDI
GND
MR
LOW LINE
RESET
RESET
WDO
CE OUT
CE IN
BATT ON
BATT
BATT OK
OUT
FUNCTION
The power-fail comparator remains active in battery-backup mode for V CC ≥ 4V.
The power-fail comparator remains active in battery-backup mode for V CC ≥ 4V. Below 4V, PFO is forced low.
Battery switchover comparator monitors V CC for active switchover.
WDI is ignored and goes high impedance
Ground—0V reference for all signals
MR is ignored
Logic low
Logic high; the open-circuit output voltage is equal to V CC .
Logic low
Logic high. The open-circuit output voltage is equal to V CC .
Logic high. The open-circuit output voltage is equal to V BATT .
High impedance
Logic high. The open-circuit output voltage is equal to V BATT .
Supply current is 1μA maximum for V BATT ≤ 2.8V.
Logic high when V BATT exceeds 2.285V. Valid for V CC ≥ 4V. Below 4V, BATT OK is forced low.
OUT is connected to BATT through two internal PMOS switches in series.
Backup-Battery Input
The BATT input is similar to V CC , except the PMOS
switch is much smaller. This input is designed to con-
duct up to 20mA to OUT during battery backup. The
MAX807
V CC
CONTROL
CIRCUITRY
P
OUT
0.1 μ F
on-resistance of the PMOS switch is approximately
13 ? . Figure 12 shows the two series pass elements
between the BATT input and OUT that facilitate UL
approval. V BATT can exceed V CC during normal opera-
tion without causing a reset.
Output Supply Voltage
The output supply (OUT) transfers power from V CC or
BATT
P
P
BATT to the μP, RAM, and other external circuitry. At
the maximum source current of 250mA, V OUT will typi-
cally be 260mV below V CC . Decouple this terminal with
a 0.1μF capacitor.
BATT ON Output
Figure 12. V CC and BATT-to-OUT Switch
Battery-Backup Mode
Battery backup preserves the contents of RAM in the
event of a brownout or power failure. With a backup
battery installed at BATT, the MAX807 automatically
switches RAM to backup power when V CC falls. Two
conditions are required for switchover to battery-back-
up mode: 1) V CC must be below the reset threshold; 2)
V CC must be below V BATT . Table 1 lists the status of
inputs and outputs during battery-backup mode.
The battery on (BATT ON) output indicates the status of
the internal battery switchover comparator, which con-
trols the internal V CC and BATT switches. For V CC
greater than V BATT (ignoring the small hysteresis
effect), BATT ON typically sinks 3.2mA at 0.4V. In bat-
tery-backup mode, this output sources approximately
5mA. Use BATT ON to indicate battery switchover sta-
tus, or to supply gate or base drive for an external pass
transistor for higher current applications (see the
Typical Operating Circuit ).
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX807NEPE+ | 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 |
| MAX807NEUE | 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 |
| MAX807NEUE+ | 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 |
| MAX807NEUE+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 |
| MAX807NEUE-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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