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| 型号： | MAX6307EUK31D3+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/11页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR 3.080V SOT23-5 |
| 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： | 3.08V，可调 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23-5 |
| 包装： | 带卷 (TR) |
5-Pin, Multiple-Input,
Programmable Reset ICs
V IN
V CC
V CC
V CC
R1
MAX6305–
MAX6313
MAX6305
R2
C*
RST IN_
V TH =
(
R1 + R2
R2
)
V RSTH
MAX6306 RESET
MAX6307
RESET
RESET
μ P
(
GND
*? C =
1 R1 + R2
2 π R1 x R2 x C
)
GENERATOR
GND
GND
*FOR ADDITIONAL NOISE IMMUNITY
Figure 2. Increasing Noise Immunity
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 1M ? , the resulting error is
±25 x 10 -9 x 1 x 10 6 = ±25mV.
Like the V CC 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 0.1μF between
RST IN and GND (Figure 2). This creates a single-pole
lowpass filter with a corner frequency given by:
f = (1/2 π ) / (R1 + R2)(R1 x R2 x C)
For example, if R1 = 1M ? and R2 = 1.6M ? , adding a
0.1μF 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 μPs with
Bidirectional Reset Pins
Since the RESET output on the MAX6305/MAX6306/
MAX6307 is open drain, these devices interface easily
with μPs that have bidirectional reset pins, such as the
Motorola 68HC11. Connecting the μP 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).
Figure 3. Interfacing to μPs with Bidirectional Reset I/O
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
V CC transients (glitches).
The Typical Operating Characteristics show the
Maximum Transient Duration vs. V CC Reset Threshold
Overdrive, for which reset pulses are not generated.
The graph was produced using negative-going pulses,
starting at V TH 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 V CC 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 0.1μF bypass capacitor mounted close to the RST IN_,
OVRST IN, and/or the V CC pin provides additional tran-
sient immunity.
Ensuring a Valid RESET /RESET
Output Down to V CC = 0V
When V CC 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 μPs and other circuitry do not operate
with V CC 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
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6307EUK31D4-T | 功能描述:监控电路 5-Pin Multiple-Input Programmable Reset ICs. 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 |
| MAX6307EUK32D1-T | 功能描述:监控电路 5-Pin Multiple-Input Programmable Reset ICs. 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 |
| MAX6307EUK32D2-T | 功能描述:监控电路 5-Pin Multiple-Input Programmable Reset ICs. 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 |
| MAX6307EUK32D3-T | 功能描述:监控电路 5-Pin Multiple-Input Programmable Reset ICs. 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 |
| MAX6307EUK32D4-T | 功能描述:监控电路 5-Pin Multiple-Input Programmable Reset ICs. 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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