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| 型号： | MAX791CSE |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 1/19页 |
| 文件大小： | 0K |
| 描述： | IC MPU SUPERVISOR CIRCUIT 16SOIC |
| 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 |
| 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： | 0°C ~ 70°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： | 管件 |
19-0075; Rev. 7; 11/05
Microprocessor Supervisory Circuit
General Description
Features
The MAX791 microprocessor (μP) supervisory circuit
reduces the complexity and number of components need-
ed to monitor power-supply and battery-control functions
in μP systems. The 50μA supply current makes the
MAX791 ideal for use in portable equipment, while the 6ns
chip-enable propagation delay and 250mA output capa-
bility (25mA in battery-backup mode) make it suitable for
larger, higher-performance equipment.
The MAX791 comes in 16-pin DIP, TSSOP, and narrow SO
packages and provides the following functions:
– — — — — –
? μP reset. R E S E T output is asserted during power-up,
power-down, and brownout conditions, and is guaran-
teed to be in the correct state for V CC down to 1V,
even with no battery in the circuit.
? Manual-reset input.
? A 1.25V threshold detector provides for power-fail
warning and low-battery detection, or monitors a
?
?
?
?
?
?
?
?
?
?
Precision 4.65V Voltage Monitoring
200ms Power-OK / Reset Time Delay
Independent Watchdog Timer—Preset or Adjustable
1μA Standby Current
Power Switching
250mA Output in V CC Mode
25mA Output in Battery-Backup Mode
On-Board Gating of Chip-Enable Signals
Memory Write-Cycle Completion
6ns CE Gate Propagation Delay
MaxCap ? or SuperCap ? Compatible
Voltage Monitor for Power-Fail or Low-Battery Warning
Backup-Battery Monitor
– — — — — –
Guaranteed R E S E T Valid to V CC = 1V
Ordering Information
power supply other than +5V.
? Two-stage power-fail warning. A separate low-line
comparator compares V CC to a threshold 150mV
above the reset threshold.
? Backup-battery switchover for CMOS RAM, real-time
clocks, μPs, or other low-power logic.
? Software monitoring of backup-battery voltage.
? A watchdog-fault output is asserted if the watchdog
input has not been toggled within either a preset or
an adjustable timeout period.
? Write protection of CMOS RAM or EEPROM.
PART
MAX791CPE
MAX791CSE
MAX791C/D
MAX791CUE
MAX791EPE
MAX791ESE
MAX791EJE
MAX791EUE
TEMP RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 Plastic DIP
16 Narrow SO
Dice*
16 TSSOP
16 Plastic DIP
16 Narrow SO
16 CERDIP
16 TSSOP
– — — –
? Pulsed watchdog output to give advance warning of
impending W D O assertion caused by watchdog timeout.
MAX791MJE -55°C to +125°C
* Dice are specified at T A = +25°C.
16 CERDIP
Applications
Devices in PDIP, SO and TSSOP packages are available in both
leaded and lead-free packaging. Specify lead free by adding
Computers
Controllers
Portable/Battery-
Powered Equipment
Critical μP Power Monitoring
Intelligent Instruments
the + symbol at the end of the part number when ordering.
Lead free not available for CERDIP package.
Typical Operating Circuit
Pin Configuration
+5V
0.1 μ F
0.1 μ F
CMOS
RAM
TOP VIEW
VBATT 1
V OUT 2
V CC 3
16 WDPO
15 RESET
14 WDO
0.47F*
OTHER SYSTEM
RESET SOURCES
V CC
VBATT
BATT
ON
SWT
V OUT
CE OUT
GND 4
BATT ON 5
PFO 6
MAX791
13 CE IN
12 CE OUT
11 WDI
+12V
MR
PFI MAX791
CE IN
ADDRESS
DECODE
A0–A15
μ P
PFI 7
SWT 8
10 LOWLINE
9 MR
+12V SUPPLY
FAILURE
PFO
GND
WDI
LOWLINE
RESET
I/O
NMI
RESET
WDO
INT
DIP/SO/TSSOP
*MaxCap
MaxCap is a registered trademark of Cesiwid Inc. SuperCap is a registered trademark of Baknor Industries.
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX791CSE+ | 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 |
| MAX791CSE+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 |
| MAX791CSE-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 |
| MAX791CUE | 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 |
| MAX791CUE+ | 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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