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| 型号： | MAX6746KA16+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/14页 |
| 文件大小： | 0K |
| 描述： | IC RESET MPU W/ADJ RESET SOT23-8 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 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： | 1.575V |
| 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： | 1417 (CN2011-ZH PDF) |
| 其它名称： | MAX6746KA16+TDKR |
MAX6746–MAX6753
μP Reset Circuits with Capacitor-Adjustable
Reset/Watchdog Timeout Delay
guarantee RESET IN threshold accuracy and timing
V MON_TH
performance. The MAX6748 and MAX6749 can be con-
figured to monitor V CC voltage by connecting V CC to
V MON_TH.
R1
RESET IN
V CC
V CC
Dual-Voltage Monitoring
(MAX6750/MAX6751)
The MAX6750 and MAX6751 contain both factory-
trimmed threshold voltages and an adjustable reset
threshold input, allowing the monitoring of two voltages,
R2
GND
MAX6748
MAX6749
MAX6750
MAX6751
V CC and V MON_TH (see Figure 2). RESET is asserted
when either of the voltages falls below it respective
threshold voltages.
Manual Reset (MAX6746/MAX6747)
Many μP-based products require manual reset capabil-
ity, to allow an operator or external logic circuitry to initi-
ate a reset. The manual reset input ( MR ) can connect
directly to a switch without an external pullup resistor or
debouncing network. MR is internally pulled up to V CC
and, therefore, can be left unconnected if unused.
Figure 3. Adding an External Manual Reset Function to the
MAX6748–MAX6751
where V MON_TH is the desired reset threshold voltage
and V TH is the reset input threshold (1.235V). Resistors
R1 and R2 can have very high values to minimize cur-
rent consumption due to low leakage currents. Set R2
to some conveniently high value (500k Ω , for example)
and calculate R1 based on the desired reset threshold
voltage, using the following formula:
R1 = R2 x (V MON_TH /V RESET IN - 1) ( Ω )
The MAX6748 and MAX6749 do not monitor V CC sup-
ply voltage, therefore, V CC must be greater than 1.5V to
V CC
MR is designed to reject fast, falling transients (typically
100ns pulses) and it must be held low for a minimum of
1μs to assert the reset output. A 0.1μF capacitor from
MR to ground provides additional noise immunity. After
MR transitions from low to high, reset remains asserted
for the duration of the reset timeout period.
A manual reset option can easily be implemented
with the MAX6748–MAX6751 by connecting a normally
open momentary switch in parallel with R2 (Figure 3).
When the switch is closed, the voltage on RESET IN
goes to zero, initiating a reset. Similar to the MAX6746/
MAX6747 manual reset, reset remains asserted while
the voltage at RESET IN is zero and for the reset time-
out period after the switch is opened.
WDI
t WD
t RP
OV
V CC
RESET
OV
NORMAL MODE (WDS = GND)
Figure 4a. Watchdog Timing Diagram, WDS = GND
8
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6746KA17 | 制造商:Maxim Integrated Products 功能描述:MICROPROCESSOR RESET CIRCUITS WITH - Rail/Tube |
| MAX6746KA17+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 |
| MAX6746KA17-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 |
| MAX6746KA18 | 制造商:Maxim Integrated Products 功能描述:MICROPROCESSOR RESET CIRCUITS WITH - Rail/Tube |
| MAX6746KA18+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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