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参数资料
| 型号： | MAX794ESE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/20页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU 16-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 备用电池电路 |
| 监视电压数目： | 1 |
| 输出： | 开路漏极，推挽式 |
| 复位： | 高有效/低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 可调节/可选择 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 带卷 (TR) |
3.0V/3.3V Adjustable Microprocessor
Supervisory Circuits
______________________________________________________________Pin Description
PIN
MAX793/
MAX794
MAX795
NAME
FUNCTION
Supply Output for CMOS RAM. When V CC rises above the reset threshold or above
1
1
OUT
V BATT , OUT is connected to V CC through an internal p-channel MOSFET switch. When
V CC falls below V SW and V BATT , BATT connects to OUT.
2
3
2
—
V CC
BATT OK
(MAX793)
RESET IN
(MAX794)
Main Supply Input
Battery Status Output. High in normal operating mode when V BATT exceeds V BOK , other-
wise low. V BATT is checked continuously. Disabled and logic low while V CC is below V SW .
Reset Input. Connect to an external resistor-divider to select the reset threshold. The
reset threshold can be programmed anywhere in the V SW to 5.5V range.
Power-Fail Comparator Input. When PFI is less than V PFT or when V CC falls below V SW ,
4
—
PFI
PFO goes low; otherwise, PFO remains high (see Power-Fail Comparator section).
Connect to V CC if unused.
Logic Output/External Bypass Switch-Driver Output. High when OUT switches to BATT.
5
3
BATT ON
Low when OUT switches to V CC . Connect the base/gate of PNP/PMOS transistor to
BATT ON for I OUT requirements exceeding 75mA.
6
4
GND
Ground
Power-Fail Comparator Output. When PFI is less than V PFT or when V CC falls below
7
—
PFO
V SW , PFO goes low; otherwise, PFO remains high. PFO is also used to enable the bat-
tery freshness seal (see Battery Freshness Seal and Power-Fail Comparator sections).
Manual Reset Input. A logic low on MR asserts reset. Reset remains asserted as long as
8
—
MR
MR is low and for 200ms after MR returns high. The active-low input has an internal
70μA pullup current. It can be driven from a TTL- or CMOS-logic line or shorted to
ground with a switch. Leave open if unused.
Watchdog Output. WDO goes low if WDI remains either high or low for longer than the
9
—
WDO
watchdog timeout period. WDO returns high on the next transition of WDI. WDO is a
logic high for V SW < V CC < V RST , and low when V CC is below V SW .
Watchdog Input. If WDI remains either high or low for longer than the watchdog timeout
10
—
WDI
period, the internal watchdog timer runs out and WDO goes low. WDO returns high on
the next transition of WDI. Connect WDO to MR to generate a reset due to a watchdog
fault.
11
5
CE IN
Chip-Enable Input. The input to the chip-enable gating circuit. Connect to GND if unused.
Chip-Enable Output. CE OUT goes low only when CE IN is low and reset is not asserted.
12
6
CE OUT
If CE IN is low when reset is asserted, CE OUT remains low for 10μs or until CE IN goes
high, whichever occurs first. CE OUT is pulled up to OUT.
13
14
—
—
RESET
LOWLINE
Active-High Reset Output. Sources and sinks current. RESET is the inverse of RESET .
Early Power-Fail Warning Output. Low when V CC falls to V LR . This output can be used to
generate an NMI to provide early warning of imminent power failure.
Open-Drain, Active-Low Reset Output. Pulses low for 200ms when triggered, and stays
15
7
RESET
low whenever V CC is below the reset threshold or when MR is a logic low. It remains low
for 200ms after either V CC rises above the reset threshold, the watchdog triggers a reset
( WDO connected to MR ), or MR goes low to high.
Backup-Battery Input. When V CC falls below V SW and V BATT , OUT switches from V CC to
16
8
BATT
BATT. When V CC rises above the reset threshold or above V BATT , OUT reconnects to
V CC . V BATT can exceed V CC . Connect V CC , OUT, and BATT together if no battery is
used.
_______________________________________________________________________________________
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX795RCPA | 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 |
| MAX795RCPA+ | 功能描述:监控电路 3/3.3/AdjV 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 |
| MAX795RCSA | 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 |
| MAX795RCSA+ | 功能描述:监控电路 3/3.3/AdjV 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 |
| MAX795RCSA+T | 功能描述:监控电路 3/3.3/AdjV 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 |
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