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| 型号： | MAX6394US445D3+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/7页 |
| 文件大小： | 0K |
| 描述： | IC MPU/RESET CIRC 4.45V SOT143-4 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 最小 105 ms |
| 电压 - 阀值： | 4.45V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-253-4，TO-253AA |
| 供应商设备封装： | SOT-143-4 |
| 包装： | 带卷 (TR) |
High-Accuracy μP Reset Circuit
Detailed Description
Reset Output
A microprocessor’s (μP’s) reset input starts the μP in a
known state. The MAX6394 asserts a reset signal to
+3.3V
VCC
+5.0V
prevent code-execution errors during power-up, power-
down, or brownout conditions. RESET is guaranteed to
be a logic-low for V CC > 1V (see the Electrical
Characteristics table). Once V CC exceeds the reset
threshold, the internal timer keeps RESET asserted for
MR
RESET
10k Ω
5V SYSTEM
the reset timeout period (t RP ); after this interval RESET
goes high. If a brownout condition occurs (monitored
voltage dips below its programmed reset threshold),
RESET goes low. Any time V CC dips below the reset
threshold, the internal timer resets to zero and RESET
goes low. The internal timer starts when V CC returns
above the reset threshold, and RESET remains low for
the reset timeout period.
The MAX6394 ’s RESET output structure is a simple
open-drain n-channel MOSFET switch. Connect a pullup
resistor to any supply in the 0 to +6V range. Select a
resistor value large enough to register a logic-low when
RESET is asserted (see the Electrical Characteristics
table), and small enough to register a logic-high while
supplying all input current and leakage paths connect-
ed to the RESET line. A 10k Ω pullup is sufficient in most
applications.
Often, the pullup connected to the MAX6394’s RESET
output connects to the supply voltage monitored at the
IC’s VCC pin. However, some systems may use the
open-drain output to level-shift from the monitored sup-
ply to reset circuitry powered by some other supply
(Figure 1). This is one useful feature of an open-drain
output. Keep in mind that as the MAX6394 ’s V CC
decreases below 1V, so does the IC’s ability to sink
current at RESET . Finally, with any pullup, RESET is
pulled high as V CC decays toward 0V. The voltage
where this occurs depends on the pullup resistor value
and the voltage to which it connects (see the Electrical
Characteristics table).
Manual-Reset Input
Many μP-based products require manual-reset capa-
bility, allowing the operator, a test technician, or exter-
nal logic circuitry to initiate a reset. A logic-low on MR
asserts reset. RESET remains asserted while MR is
low, and for the reset active timeout period after MR
MAX6394
GND
Figure 1. MAX6394 Open-Drain RESET Output Allows Use with
Multiple Supplies
tary switch from MR to GND to create a manual reset
function; external debounce circuitry is not required.
If MR is driven from long cables or if the device is used
in a noisy environment, connecting a 0.1μF capacitor
from MR to ground provides additional noise immunity.
Applications Information
Negative-Going V CC Transients
In addition to issuing a reset to the μP during power-up,
power-down, and brownout conditions, these devices
are relatively immune to short-duration negative-going
transients (glitches). The Typical Operating Character-
istics show the Maximum Transient Duration vs. Reset
Threshold Overdrive, for which reset pulses are not
generated. The graph was produced using negative-
going pulses, starting at VRST max and ending below
the programmed reset threshold by the magnitude indi-
cated (reset threshold overdrive). The graph shows the
maximum pulse width that a negative-going V CC tran-
sient may typically have without causing a reset pulse
to be issued. As the transient amplitude increases (i.e.,
goes farther below the reset threshold), the maximum
allowable pulse width decreases. A 0.1μF bypass
capacitor mounted close to VCC provides additional
transient immunity.
returns high.
MR has an internal 63k Ω pullup resistor, so it can be
left open if not used. Connect a normally open momen-
TRANSISTOR COUNT: 519
Chip Information
4
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6394US445D4+T | 功能描述:监控电路 MPU Reset Circuit 4.50V 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 |
| MAX6394US455D1+T | 功能描述:监控电路 MPU Reset Circuit 4.63V 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 |
| MAX6394US455D2+T | 功能描述:监控电路 MPU Reset Circuit 4.63V 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 |
| MAX6394US455D3+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
| MAX6394US455D3+T | 功能描述:监控电路 MPU Reset Circuit 4.63V 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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