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参数资料
| 型号： | MAX6312UK47D2-T |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 5-Pin, Multiple-Input, Programmable Reset ICs |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| 封装： | MO-178AA, SOT-23, 5 PIN |
| 文件页数： | 9/11页 |
| 文件大小： | 119K |
| 代理商： | MAX6312UK47D2-T |
MAX6305–MAX6313
5-Pin, Multiple-Input,
Programmable Reset ICs
_
__
_
7
The ±25nA max input leakage current allows resistors on
the order of megohms. Choose the pull-up resistor in the
divider to minimize the error due to the input leakage cur-
rent. The error term in the calculated threshold is simply:
±25nA x R1
If you choose R1 to be 1MΩ, the resulting error is
±25 x 10-9 x 1 x 106 = ±25mV.
Like the VCC voltage monitors on the MAX6306/MAX6307/
MAX6309/MAX6310/MAX6312/MAX6313, the RST IN_
inputs (when used with a voltage divider) are designed to
ignore fast voltage transients. Increase the noise immunity
by connecting a capacitor on the order of 0.1F between
RST IN and GND (Figure 2). This creates a single-pole
lowpass filter with a corner frequency given by:
f = (1/2π) / (R1 + R2)(R1 x R2 x C)
For example, if R1 = 1MΩ and R2 = 1.6MΩ, adding a
0.1F capacitor from RST IN_ to ground results in a
lowpass corner frequency of f = 2.59Hz. Note that
adding capacitance to RST IN slows the circuit’s overall
response time.
__________Applications Information
Interfacing to Ps with
Bidirectional Reset Pins
Since the
RESET output on the MAX6305/MAX6306/
MAX6307 is open drain, these devices interface easily
with Ps that have bidirectional reset pins, such as the
Motorola 68HC11. Connecting the P supervisor’s
RESET output directly to the microcontroller’s RESET
pin with a single pull-up resistor allows either device to
assert reset (Figure 3).
Negative-Going VCC Transients
In addition to issuing a reset to the P during power-up,
power-down, and brownout conditions, these devices
are relatively immune to short-duration, negative-going
VCC transients (glitches).
The
Typical Operating Characteristics show the
Maximum Transient Duration vs. VCC Reset Threshold
Overdrive, for which reset pulses are not generated.
The graph was produced using negative-going pulses,
starting at VTH max, and ending below the pro-
grammed reset threshold by the magnitude indicated
(reset threshold overdrive). The graph shows the maxi-
mum pulse width that a negative-going VCC transient
may typically have without causing a reset pulse to be
issued. As the amplitude of the transient increases (i.e.,
goes farther below the reset threshold), the maximum
allowable pulse width decreases.
RST IN_/OVRST IN are also immune to negative/positive-
going transients (see
Typical Operating Characteristics).
A 0.1F bypass capacitor mounted close to the RST IN_,
OVRST IN, and/or the VCC pin provides additional tran-
sient immunity.
Ensuring a Valid
RESET/RESET
Output Down to VCC = 0V
When VCC falls below 1V, push/pull structured RESET/
RESET current sinking (or sourcing) capabilities
decrease drastically. High-impedance CMOS-logic
inputs connected to
RESET can drift to undetermined
voltages. This presents no problem in most applica-
tions, since most Ps and other circuitry do not operate
with VCC below 1V. In those applications where RESET
must be valid down to 0V, adding a pull-down resistor
between
RESET and ground sinks any stray leakage
Figure 2. Increasing Noise Immunity
MAX6305–
MAX6313
C*
VIN
R1
R2
RST IN_
GND
*FOR ADDITIONAL NOISE IMMUNITY
VCC
VTH =
(
)VRSTH
R1 + R2
R2
*C =
(
)
R1 + R2
R1 x R2 x C
1
2
π
Figure 3. Interfacing to Ps with Bidirectional Reset I/O
MAX6305
MAX6306
MAX6307
RESET
GENERATOR
GND
VCC
RESET
μP
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6312UK47D3 | 制造商:Maxim Integrated Products 功能描述:5-PIN MULTIPLE-INPUT PROGRAMMABLE - Rail/Tube |
| MAX6312UK47D3+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 |
| MAX6312UK47D3-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 |
| MAX6312UK47D4 | 制造商:Maxim Integrated Products 功能描述:5-PIN MULTIPLE-INPUT PROGRAMMABLE - Rail/Tube |
| MAX6312UK47D4+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 |
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