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参数资料
| 型号： | MAX791EPE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/19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 |
| 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： | 4.65V |
| 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 |
Microprocessor Supervisory Circuit
Table 1. Input and Output States in
V OUT is connected to VBATT through
RESET
FROM
REGULATED
SUPPLY
0.1 μ F
a)
3 V CC
V OUT 2
MAX791
VBATT 1
15
LOWLINE 10
11
WDI
GND
4
0.1 μ F
3.0V
μ P POWER
POWER TO
CMOS RAM
μ P
RESET
NMI
I/O LINE
Battery-Backup Mode
PIN NAME STATUS
1 VBATT Supply current is 1μA maximum.
2 V OUT
an internal PMOS switch.
Battery-switchover comparator
3
V CC
monitors V CC for active switchover.
4
GND
GND—0V reference for all signals.
Logic high. The open-circuit output is
5
BATT ON
equal to V OUT .
The power-fail comparator remains
V CC ≥ VBATT - 1.2V typ. Below this
VOLTAGE
REGULATOR
3 V CC
0.1
μ F
V OUT 2
MAX791
VBATT 1
0.1 μ F
3.0V
μ P POWER
POWER TO
CMOS RAM
μ P
6
7
– — — –
P F O
PFI
active in the battery-backup mode for
– — — –
voltage, P F O is forced low.
The power-fail comparator remains
active in the battery-backup mode for
V CC ≥ VBATT - 1.2V typ.
8
SWT
SWT is ignored.
RESET
7
PFI
15
PFO 6
11
WDI
RESET
NMI
I/O LINE
9
10
– — –
M R
– –
— — — — —
L O W L I N E
– — –
M R is ignored.
Logic low*
GND
4
b)
Figure 9. a) If the unregulated supply is inaccessible,
LOWLINE generates the NMI for the μP. b) Use PFO to gener-
ate the μP NMI if the unregulated supply is inaccessible.
Power-Fail Input
PFI is the input to the power-fail comparator. PFI has a
11
12
13
14
15
16
WDI
– — –
C E OUT
– — –
C E IN
– — — –
W D O
– — — — — –
R E S E T
– — — — –
W D P O
WDI is ignored, and goes high
impedance.
Logic high. The open-circuit output
voltage is equal to V OUT .
High impedance
Logic high. The open-circuit output
voltage is equal to V OUT .
Logic low*
Logic high. The open-circuit output
voltage is equal to V OUT .
guaranteed input leakage of ±25nA max over tempera-
ture. The typical comparator delay is 15μs from V IL to
V OL (power failing), and 55μs from V IH to V OH (power
being restored). If unused, connect this input to
ground.
Power-Fail Output
The Power-Fail Output (PFO) goes low when PFI goes
below 1.25V. It typically sinks 3.2mA with a saturation
voltage of 0.1V. With PFI above 1.25V, PFO is actively
pulled to V OUT . Connecting PFI through a voltage-
divider to an unregulated supply allows PFO to gener-
ate an NMI as the unregulated power begins to fall
(Figure 9b). If the unregulated supply is inaccessible,
* V CC must be below the reset threshold to enter battery-
backup mode.
use LOWLINE to generate the NMI. The LOWLINE
threshold is typically 150mV above the reset threshold
(see LOWLINE Output section).
Battery-Backup Mode
The MAX791 requires two conditions to switch to bat-
tery-backup mode: 1) V CC must be below the reset
threshold; 2) V CC must be below VBATT. Table 1 lists
the status of the inputs and outputs in battery-backup
mode.
12
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX791EPE+ | 功能描述:监控电路 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 |
| MAX791ESE | 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 |
| MAX791ESE+ | 功能描述:监控电路 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 |
| MAX791ESE+T | 功能描述:监控电路 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 |
| MAX791ESE-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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