参数资料
型号: MAX6751KA+T
厂商: Maxim Integrated Products
文件页数: 8/14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: 2,500
类型: 多压监控器
监视电压数目: 2
输出: 开路漏极或开路集电极
复位: 低有效
复位超时: 可调节/可选择
电压 - 阀值: 可调节/可选择
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: 带卷 (TR)
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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MAX6752KA16 制造商:Maxim Integrated Products 功能描述:SINGLE/DUAL-VOLT MICROPROC. RESET C - Cut Tape Product
MAX6752KA16+ 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
MAX6752KA16+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
MAX6752KA16-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
MAX6752KA17 制造商:Maxim Integrated Products 功能描述:SINGLE/DUAL-VOLT MICROPROC. RESET C - Cut Tape Product