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| 型号： | MAX6750KA29+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/14页 |
| 文件大小： | 0K |
| 描述： | IC MPU/RESET CIRC SOT23-8 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 类型： | 多压监控器 |
| 监视电压数目： | 2 |
| 输出： | 推挽式，图腾柱 |
| 复位： | 低有效 |
| 复位超时： | 可调节/可选择 |
| 电压 - 阀值： | 2.925V，可调 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-8 |
| 供应商设备封装： | SOT-23-8 |
| 包装： | 标准包装 |
| 产品目录页面： | 1418 (CN2011-ZH PDF) |
| 其它名称： | MAX6750KA29+TDKR |
MAX6746–MAX6753r
μP Reset Circuits with Capacitor-Adjustable
Reset/Watchdog Timeout Delay
GUARANTEED
t WD1 (MIN) t WD1 (MAX)
t WD2 (MIN) t WD2 (MAX)
TO ASSERT
RESET
GUARANTEED TO
NOT ASSERT
GUARANTEED TO
ASSERT
WDI CONDITION 1
WDI CONDITION 2
WDI CONDITION 3
RESET
*UNDETERMINED *UNDETERMINED
RESET
FAST FAULT
NORMAL OPERATION
SLOW FAULT
*UNDETERMINED STATES MAY OR MAY NOT GENERATE A FAULT CONDITION
Figure 1. MAX6752/MAX6753 Detailed Watchdog Input Timing Relationship
Detailed Description
The MAX6746–MAX6753 assert a reset signal whenever
the V CC supply voltage or RESET IN falls below its reset
threshold. The reset output remains asserted for the
reset timeout period after V CC and RESET IN rise above
its respective reset threshold. A watchdog timer triggers
a reset pulse whenever a watchdog fault occurs.
The reset and watchdog delays are adjustable with
external capacitors. The MAX6746–MAX6751 contain a
watchdog select input that extends the watchdog time-
out period to 128x.
The MAX6752 and MAX6753 have a sophisticated
watchdog timer that detects when the processor is run-
ning outside an expected window of operation. The
watchdog signals a fault when the input pulses arrive too
early (faster that the selected t WD1 timeout period) or too
RESET is guaranteed to be in the correct logic state for
V CC greater than 1V. For applications requiring valid
reset logic when V CC is less than 1V, see the section
Ensuring a Valid RESET Output Down to V CC = 0V.
RESET IN Threshold
The MAX6748–MAX6751 monitor the voltage on RESET IN
using an adjustable reset threshold (V RESET IN ) set with
an external resistor voltage-divider (Figure 2). Use the
following formula to calculate the externally monitored
voltage (V MON_TH ):
V MON_TH = V RESET IN x (R1 + R2) / R2
V MON_TH
late (slower than the selected t WD2 timeout period) (see
Figure 1).
Reset Output
R1
RESET IN
V CC
V CC
The reset output is typically connected to the reset input
of a μP. A μP’s reset input starts or restarts the μP in a
known state. The MAX6746–MAX6753 μP supervisory
circuits provide the reset logic to prevent code-execu-
tion errors during power-up, power-down, and
R2
GND
MAX6748
MAX6749
MAX6750
MAX6751
brownout conditions (see the Typical Operating Circuit).
RESET changes from high to low whenever the moni-
tored voltage, RESET IN and/or V CC drop below the
reset threshold voltages. Once V RESET IN and/or V CC
exceeds its respective reset threshold voltage(s),
RESET remains low for the reset timeout period, then
goes high.
Maxim Integrated
V MON_TH = 1.235 x (R1 + R2) / R2
Figure 2. Calculating the Monitored Threshold Voltage
(V MON_TH )
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6750KA30 | 制造商:Maxim Integrated Products 功能描述:SINGLE/DUAL-VOLT MICROPROC. RESET C - Rail/Tube |
| MAX6750KA30+ | 制造商:Maxim Integrated Products 功能描述:MAXIM MAX6750KA30+, SUPERVISORS - Tape and Reel 制造商:Maxim Integrated Products 功能描述:Maxim MAX6750KA30+, Microprocessor Supervisory Circuit 3V/Adj Reset Threshold 1.575V-5V 8-pin SOT23 |
| MAX6750KA30+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 |
| MAX6750KA30-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 |
| MAX6750KA31 | 制造商:Maxim Integrated Products 功能描述:SINGLE/DUAL-VOLT MICROPROC. RESET C - Rail/Tube |
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