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| 型号： | MAX6456UT16S+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/11页 |
| 文件大小： | 0K |
| 描述： | IC MPU SUPER 1.575V SOT23-6 |
| 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： | 最小为 140 ms |
| 电压 - 阀值： | 1.575V，可调 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 |
| 供应商设备封装： | SOT-6 |
| 包装： | 带卷 (TR) |
μP Supervisors with Separate V CC Reset and
Manual Reset Outputs
Manual Reset
The MAX6453/MAX6454 contain a manual reset output
( MROUT ) that asserts low immediately after driving MR
MR
MROUT
210ms
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-
Figure 1. MAX6453/MAX6454 Timing Diagram
Detailed Description
Reset Output
The reset output is typically connected to the reset
input of a microprocessor (μP). A μP’s reset input starts
or restarts the μP in a known state. The MAX6453 –
MAX6456 μP 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 V CC ) drops below the reset
threshold voltages. When V RSTIN and V CC 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 extended (typ) setup timeout period and deasserts
140ms (min) after MR deasserts.
RESET is guaranteed to be in the proper output logic
state for V CC inputs ≥ 1V. For applications requiring valid
ately upon driving MR low. Driving MR low for longer
than the extended (typ) setup timeout 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
(V MON-TH ):
V MON-TH = V TH-RSTIN ? (R1 +R2)/R2
where V MON_TH is the desired reset threshold voltage
and V TH-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 Ω , for
example) and calculate R1 based on the desired reset
threshold voltage, using the following formula:
R1 = R2 ? (V MON_TH /V TH - 1) Ω
reset logic when V CC is less than 1V, see the Ensuring a
Valid RESET Output Down to V CC = 0V section.
LONG SETUP PERIOD
MR
210ms
MROUT
RESET
Figure 2. MAX6455/MAX6456 Timing Diagram
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6456UT17S | 制造商:Maxim Integrated Products 功能描述:+P SUPERVISORS WITH SEPARATE VCC RE - Rail/Tube |
| MAX6456UT17S+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR ADJV 7UA 6PIN SOT-23 - Rail/Tube |
| MAX6456UT17S+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 |
| MAX6456UT17S-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 |
| MAX6456UT22S | 制造商:Maxim Integrated Products 功能描述:+P SUPERVISORS WITH SEPARATE VCC RE - Rail/Tube |
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