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参数资料
| 型号： | MAX6843UKD3+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/9页 |
| 文件大小： | 0K |
| 描述： | IC MPU DETECT RESET SOT23-5 |
| 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： | 推挽式，图腾柱 |
| 复位： | 低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 可调节/可选择 |
| 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) |
Ultra-Low-Voltage μP Reset Circuits and
Voltage Detectors
RESET IN decreases. The MAX6843/MAX6844/
MAX6845 assert a reset when the voltage at RESET IN
falls below the RESET IN threshold (V RSTIN ). The low-
leakage current at RESET IN allows for relatively large-
value resistors to be used, which reduces power
consumption. For example, for V CC-TH = 0.9V, if R2 =
100k ? , then R1 = 26.3k ? .
Applications Information
V CC Falling Transients
The MAX6841–MAX6845 are relatively immune to short-
duration falling V CC transients (glitches). Figure 2
shows typical transient duration vs. reset comparator
overdrive, for which the MAX6841–MAX6845 do not
generate a reset pulse. The graph was generated using
a falling pulse applied to V CC , starting 0.1V above the
actual reset threshold and ending below it by the mag-
nitude indicated (reset comparator overdrive). The
most applications, because most μP and other circuitry
are inoperative with V CC lower than 0.55V. However, in
applications in which RESET must be valid down to 0,
adding a pulldown resistor to RESET causes any stray
leakage currents to flow to ground, holding RESET low
(Figure 3). R3’s value is not critical; 200k ? is large
enough not to load RESET and small enough to pull
RESET to ground.
V CC
MAX6841
MAX6843
RESET
graph indicates the maximum pulse width that a falling
V CC transient can have without causing a reset pulse.
As the magnitude of the transient increases (goes fur-
ther below the reset threshold), the maximum allowable
GND
R3
pulse width decreases. A 0.1μF bypass capacitor
mounted as close as possible to the V CC pin provides
additional transient immunity.
Ensuring a Valid Reset Output
Down to V CC = 0
When V CC falls below 0.55V, the MAX6841/MAX6843
push-pull RESET output no longer sinks current; it
becomes an open circuit. Therefore, high-impedance
CMOS-logic inputs connected to RESET can drift to
undetermined voltages. This presents no problem in
MAXIMUM TRANSIENT DURATION
vs. OVERDRIVE
600
Figure 3. RESET Valid to V CC = 0
A 200k ? pullup resistor to V CC is also recommended
for the MAX6841/MAX6842/MAX6844 if push-pull
RESET is required to remain valid for V CC ≤ 0.75V.
Interfacing to μPs with Bidirectional
Reset Pins
Because the RESET output on the MAX6842/MAX6845
is open drain, these devices interface easily with μPs
that have bidirectional reset pins. Connecting the μP
supervisor’s RESET output directly to the μP’s RESET
pin with a single pullup resistor allows either device to
assert reset (Figure 4).
550
500
RESET OCCURS ABOVE THIS LINE
V CC
450
400
350
300
250
200
150
100
V CC
MAX6842
MAX6845
RESET
GND
RESET
INPUT
V CC
μ P
GND
1
10
100
OVERDRIVE V TH - V CC (mV)
Figure 4. Interfacing to Microprocessors with Bidirectional
Figure 2. Maximum Transient Duration vs. Overdrive
Reset I/0
6
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相关代理商/技术参数 |
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|---|---|
| MAX6843UKD4 | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX6843UKD4+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR ADJV 8.1UA 5PIN SOT-23 - Rail/Tube |
| MAX6843UKD4+T | 功能描述:监控电路 NULL 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 |
| MAX6843UKD4-T | 功能描述:监控电路 NULL 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 |
| MAX6844UKD0 | 制造商:Maxim Integrated Products 功能描述:- Cut Tape Product |
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