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| 型号： | MAX6324AUT29-T |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | Analog IC |
| 中文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO6 |
| 封装： | ROHS COMPLIANT, SOT-23, 6 PIN |
| 文件页数： | 12/13页 |
| 文件大小： | 168K |
| 代理商： | MAX6324AUT29-T |
MAX6323/MAX6324
falls below the preset threshold or when the manual
reset input (MR) is asserted. The RESET output remains
asserted for at least 100ms after VCC has risen above
the reset threshold and MR is deasserted (Figure 5).
For noisy environments, bybass VCC with a 500pF (min)
capacitor to ensure correct operation.
The MAX6323 has a push-pull output stage, and the
MAX6324 utilizes an open-drain output. Connect a pull-
up resistor on the RESET output of the MAX6324 to any
supply up to +6V. Select a resistor value large enough
to register a logic low (see
Electrical Characteristics)
and small enough to register a logic high while supply-
ing all input leakage currents and leakage paths con-
nected to the RESET line. A 10k
pullup is sufficient in
most applications.
Manual Reset Input
Many P-based products require manual reset capabil-
ity to allow an operator or external logic circuitry to initi-
ate a reset. The manual reset input (MR) can connect
directly to a switch without an external pullup resistor or
debouncing network. MR is internally pulled up to VCC
and, therefore, can be left unconnected if unused. MR
is designed to reject fast, negative-going transients
(typically 100ns pulses), and it must be held low for a
minimum of 1s to assert the reset output (Figure 5). A
0.1F capacitor from MR to ground provides additional
noise immunity. After MR transitions from low to high,
reset will remain asserted for the duration of the reset
timeout period, at least 100ms.
Applications Information
Negative-Going VCC Transients
The MAX6323/MAX6324 are relatively immune to short-
duration negative-going VCC transients (glitches),
which usually do not require the entire system to shut
down. Typically, 200ns large-amplitude pulses (from
ground to VCC) on the supply will not cause a reset.
Lower amplitude pulses result in greater immunity.
Typically, a VCC transient that falls 100mV below the
reset threshold and lasts less than 20s will not trigger
a reset (see
Typical Operating Characteristics). An
optional 0.1F bypass capacitor mounted close to VCC
provides additional transient immunity.
Ensuring a Valid Reset Output
Down to VCC = 0V
When VCC falls below +1.2V, the MAX6323 RESET out-
put no longer sinks current; it becomes an open circuit.
Therefore, high-impedance CMOS logic inputs con-
nected to RESET can drift to undetermined voltages.
This does not present a problem in most applications,
since most Ps and other circuitry are inoperative with
VCC below +1.2V. 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 6). R1’s
value is not critical; 100k
is large enough not to load
RESET and small enough to pull RESET to ground. This
scheme does not work with the open-drain output of the
MAX6324.
P Supervisory Circuits with Windowed
(Min/Max) Watchdog and Manual Reset
8
_______________________________________________________________________________________
MR
RESET
VCC
VTH
100ms (min)
120ns (typ)
20
s (typ)
1
s (min)
100ms (min)
Figure 5. RESET Timing Relationship
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相关代理商/技术参数 |
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| MAX6324AUT31 | 制造商:Maxim Integrated Products 功能描述:UP SUPERVISORY CIRCUIT WITH WINDOWE - Cut Tape Product |
| MAX6324AUT31+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX6324AUT31+T | 功能描述:监控电路 uPower Supervisor 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 |
| MAX6324AUT31-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 |
| MAX6324AUT44 | 制造商:Maxim Integrated Products 功能描述:UP SUPERVISORY CIRCUIT WITH WINDOWE - Cut Tape Product |
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