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参数资料
| 型号： | MAX6832VXRD2+T |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | Ultra-Low-Voltage SC70 Voltage Detectors and µP Reset Circuits |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO3 |
| 封装： | SC-70, 3 PIN |
| 文件页数： | 9/11页 |
| 文件大小： | 197K |
| 代理商： | MAX6832VXRD2+T |
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 VCC of 1.1V is
required to guarantee the RESET-IN threshold accura-
cy (see Electrical Characteristics table).
Applications Information
Negative-Going VCC Transients
In addition to issuing a reset to the P during power-up,
power-down, and brownout conditions, the MAX6832–
MAX6840 are relatively immune to short-duration nega-
tive-going VCC 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 VCC, starting
0.1V above the actual reset threshold and ending
below it by the magnitude indicated (reset comparator
overdrive). The graph indicates the maximum pulse
width a negative-going VCC 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 0.1F
bypass capacitor mounted as close as possible to the
VCC pin provides additional transient immunity.
Ensuring a Valid Reset Output
Down to VCC = 0
When VCC 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
can drift to undetermined voltages. This presents no
problem in most applications since most P and other
circuitry are inoperative with VCC 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 VCC is also recommended
for the MAX6833/MAX6836/MAX6839 if RESET is
required to remain valid for VCC < 0.85V.
Interfacing to Ps with Bidirectional
Reset Pins
Since the RESET output on the MAX6834/MAX6837/
MAX6840 is open-drain, these devices interface easily
with Ps that have bidirectional reset pins. Connecting
the P supervisor’s RESET output directly to the P’s
RESET pin with a single pullup resistor allows either
device to assert a reset (Figure 4).
MAX6832–MAX6840
Ultra-Low-Voltage SC70 Voltage Detectors
and P Reset Circuits
_______________________________________________________________________________________
7
0
200
300
400
500
600
700
800
900
1
10
100
MAXIMUM TRANSIENT DURATION
vs. OVERDRIVE
OVERDRIVE VTH - VCC (mV)
MAXIMUM
TRANSIENT
DURATION
(
s)
100
RESET OCCURS
ABOVE THIS
LINE
Figure 2. Maximum Transient Duration Without Causing a
Reset Pulse vs. Reset Comparator Overdrive
R3
100k
VCC
GND
MAX6832
MAX6835
MAX6838
RESET
Figure 3. RESET Valid to VCC = Ground Circuit
RESET
GND
RESET
INPUT
MAX6834
MAX6837
MAX6840
BIDIRECTIONAL
P
GND
VCC
Figure 4. Interfacing to Ps with Bidirectional Reset I/O
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6832VXRD3 | 制造商:Maxim Integrated Products 功能描述:ULTRA-LOW-VOLTAGE SC70 VOLTAGE DET - Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
| MAX6832VXRD3+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 1.575V 16UA 3PIN SC-70 - Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
| MAX6832VXRD3+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 |
| MAX6832VXRD3-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 |
| MAX6832VXRD4 | 制造商:Maxim Integrated Products 功能描述:ULTRA-LOW-VOLTAGE SC70 VOLTAGE DET - Rail/Tube |
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