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| 型号： | MAX6835IXSD0+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/11页 |
| 文件大小： | 0K |
| 描述： | IC MPU SUPERVISOR SC70-4 |
| 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： | 推挽式，图腾柱 |
| 复位： | 低有效 |
| 复位超时： | 标准为 70 µs |
| 电压 - 阀值： | 1.388V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-82A，SOT-343 |
| 供应商设备封装： | SC-70-4 |
| 包装： | 带卷 (TR) |
MAX6832–MAX6840
Ultra-Low-Voltage SC70 Voltage Detectors
and μP Reset Circuits
at RESET-IN allows for relatively large-value resistors to
be used, which reduce power consumption. For exam-
ple, for a 0.6V monitored trip level, if R2 = 200k ? , then
R1 = 70.3k ? . Note that the minimum V CC of 1.1V is
required to guarantee the RESET-IN threshold accura-
cy (see Electrical Characteristics table).
Applications Information
Negative-Going V CC Transients
In addition to issuing a reset to the μP during power-up,
power-down, and brownout conditions, the MAX6832–
MAX6840 are relatively immune to short-duration nega-
tive-going V CC transients (glitches).
Figure 2 shows typical transient duration vs. reset com-
parator overdrive, for which the MAX6832–MAX6840 do
not generate a reset pulse. The graph was generated
using a negative-going pulse applied to V CC , starting
0.1V above the actual reset threshold and ending
below it by the magnitude indicated (reset comparator
can drift to undetermined voltages. This presents no
problem in most applications since most μP and other
circuitry are inoperative with V CC lower than 0.55V.
However, in applications where 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; 100k ?
is large enough not to load RESET and small enough to
pull RESET to ground.
A 100k ? pullup resistor to V CC is also recommended
for the MAX6833/MAX6836/MAX6839 if RESET is
required to remain valid for V CC < 0.85V.
V CC
MAX6832
MAX6835
MAX6838 RESET
overdrive). The graph indicates the maximum pulse
width a negative-going V CC transient can have without
causing a reset pulse. As the magnitude of the tran-
sient increases (goes farther below the reset threshold),
the maximum allowable pulse width decreases. A 0.1μF
GND
R3
100k ?
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 MAX6832/MAX6835/
MAX6838 push-pull RESET output no longer sinks cur-
rent —it becomes an open circuit. Therefore, high-
impedance CMOS logic inputs connected to RESET
MAXIMUM TRANSIENT DURATION
vs. OVERDRIVE
900
800
700
Figure 3. RESET Valid to V CC = Ground Circuit
Interfacing to μPs with Bidirectional
Reset Pins
Since the RESET output on the MAX6834/MAX6837/
MAX6840 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 a reset (Figure 4).
V CC
600
V CC
V CC
500
400
300
RESET OCCURS
ABOVE THIS
LINE
MAX6834
MAX6837
MAX6840
RESET
BIDIRECTIONAL
μ P
RESET
INPUT
200
100
0
1
10
100
GND
GND
OVERDRIVE V TH - V CC (mV)
Figure 2. Maximum Transient Duration Without Causing a
Reset Pulse vs. Reset Comparator Overdrive
Maxim Integrated
Figure 4. Interfacing to μPs with Bidirectional Reset I/O
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6835IXSD1 | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX6835IXSD1+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 1.388V 16UA 4PIN SC-70 - Rail/Tube |
| MAX6835IXSD1+T | 功能描述:监控电路 Single 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 |
| MAX6835IXSD1-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 |
| MAX6835IXSD2 | 制造商:Maxim Integrated Products 功能描述:- Cut Tape Product |
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