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参数资料
| 型号： | MAX6455UT22S-T |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | µP Supervisors with Separate VCC Reset and Manual Reset Outputs |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封装： | SOT-23, 6 PIN |
| 文件页数： | 7/10页 |
| 文件大小： | 189K |
| 代理商： | MAX6455UT22S-T |
MAX6453–MAX6456
P Supervisors with Separate VCC Reset and
Manual Reset Outputs
6
_______________________________________________________________________________________
Detailed Description
Reset Output
The reset output is typically connected to the reset
input of a microprocessor (P). A P’s reset input starts
or restarts the P in a known state. The MAX6453–
MAX6456 P supervisory circuits provide the reset
logic to prevent code-execution errors during power-
up, power-down and brownout conditions (see the
Typical Operating Circuit).
RESET changes from high to low whenever the moni-
tored voltage (RSTIN or VCC) drops below the reset
threshold voltages. When VRSTIN and VCC exceed their
respective reset threshold voltages,
RESET remains low
for the reset timeout period, and then goes high.
RESET
changes from high to low after
MR input is held low for
the 3.36s (typ) setup period and deasserts 140ms (min)
after
MR deasserts.
RESET is guaranteed to be in the proper output logic
state for VCC inputs
≥ 1V. For applications requiring valid
reset logic when VCC is less than 1V, see the Ensuring a
Valid
RESET Output Down to VCC = 0V section.
Manual Reset
The MAX6453/MAX6454 contain a manual reset output
(
MROUT) that asserts low immediately after driving MR
low and remains low for the reset timeout period after
MR goes high (Figure 1). The pushbutton manual reset
has no effect on the
RESET output. MROUT output can
be used to drive an NMI (nonmaskable interrupt) on the
processor to save valuable data.
The MAX6455/MAX6456’s
MROUT is asserted immedi-
ately upon driving
MR low. Driving MR low for longer
than the 3.36s (typ) setup period asserts
RESET. When
MR is deasserted, MROUT and RESET remain asserted
low for the reset timeout period after
MR goes high
(Figure 2).
Adjustable Input Voltage (RSTIN)
The MAX6453–MAX6456 monitor the voltage on RSTIN
using an adjustable reset threshold set with an external
resistor voltage divider (Figure 3). Use the following for-
mula to calculate the externally monitored voltage
(VMON-TH):
VMON-TH = VTH-RSTIN (R1 +R2) / R2
where VMON_TH is the desired reset threshold voltage
and VTH-RSTIN is the reset input threshold (0.63V).
Resistors R1 and R2 can have very high values to mini-
mize current consumption due to low leakage currents.
Set R2 to some conveniently high value (250k
, for
example) and calculate R1 based on the desired reset
threshold voltage, using the following formula:
R1 = R2 (VMON_TH / VTH - 1)
210ms
MROUT
RESET
MR
LONG SETUP PERIOD, 3.36s
Figure 2. MAX6455/MAX6456 Timing Diagram
210ms
MROUT
MR
Figure 1. MAX6453/MAX6454 Timing Diagram
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6455UT23S | 制造商:Maxim Integrated Products 功能描述:MICROPROCESSOR SUPERVISORS WITH SEP - Cut Tape Product 制造商:Rochester Electronics LLC 功能描述: |
| MAX6455UT23S+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR ADJV 7UA 6PIN SOT-23 - Cut Tape Product |
| MAX6455UT23S+T | 功能描述:监控电路 Dual uPower Reset Circuit 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 |
| MAX6455UT23S-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 |
| MAX6455UT26S | 制造商:Maxim Integrated Products 功能描述:MICROPROCESSOR SUPERVISORS WITH SEP - Cut Tape Product |
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