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参数资料
| 型号： | MAX6315US28D2+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/7页 |
| 文件大小： | 0K |
| 描述： | IC RESET CIRCUIT 2.80V 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： | 最小为 20 ms |
| 电压 - 阀值： | 2.8V |
| 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) |
Open-Drain SOT μP Reset Circuit
_______________Detailed Description
Reset Output
A microprocessor’s (μP’s) reset input starts the μP in a
known state. The MAX6315 asserts reset to prevent
+3.3V
V CC
+5.0V
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 the
MR
RESET
10k ?
5V SYSTEM
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 MAX6315 ’s RESET output structure is a simple
open-drain n-channel MOSFET switch. Connect a pull-
up resistor to any supply in the 0V 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 connected to the RESET line. A 10k ? pullup is
sufficient in most applications.
Often, the pull-up connected to the MAX6315’s RESET
output will connect to the supply voltage monitored at
the IC’s V CC 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 MAX6315 ’s V CC
decreases below 1V, so does the IC’s ability to sink
current at RESET . Finally, with any pullup, RESET will
be pulled high as V CC decays toward 0V. The voltage
where this occurs depends on the pull-up 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
returns high.
MAX6315
GND
Figure 1. MAX6315 Open-Drain RESET Output Allows Use
with Multiple Supplies
MR has an internal 63k ? pullup resistor, so it can be
left open if not used. Connect a normally open momen-
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 V RST 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 V CC provides additional
transient immunity.
4
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相关代理商/技术参数 |
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|---|---|
| MAX6315US28D3 | 制造商:Maxim Integrated Products 功能描述:OPEN-DRAIN SOT UP RESET CIRCUIT - Cut Tape Product |
| MAX6315US28D3+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 2.8V 5UA 4PIN SOT-143 - Cut Tape Product |
| MAX6315US28D3+T | 功能描述:监控电路 Open-Drain 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 |
| MAX6315US28D3-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 |
| MAX6315US28D4 | 制造商:Maxim Integrated Products 功能描述:OPEN-DRAIN SOT UP RESET CIRCUIT - Cut Tape Product |
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