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参数资料
| 型号： | MAX6318 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | CLAMP |
| 中文描述： | 5引脚、微处理器监控电路，带有看门狗及手动复位 |
| 文件页数： | 16/16页 |
| 文件大小： | 176K |
| 代理商： | MAX6318 |
MAX6316–MAX6322
5-Pin P Supervisory Circuits with
Watchdog and Manual Reset
_______________________________________________________________________________________
9
P-channel transistor on-resistance quickly charges
stray capacitance on the reset line, allowing RESET to
transition from low to high within the required two elec-
tronic-clock cycles, even with several devices on the
reset line. This process occurs regardless of whether
the reset was caused by VCC dipping below the reset
threshold, the watchdog timing out, MR being asserted,
or the P or other device asserting RESET. The parts do
not require an external pull-up. To minimize supply cur-
rent consumption, the internal 4.7k
pull-up resistor
disconnects from the supply whenever the MAX6316M/
MAX6318MH/MAX6319MH assert reset.
Open-Drain
R
RE
ES
SE
ETT Output
The MAX6320P/MAX6321HP/MAX6322HP have an
active-low, open-drain reset output. This output struc-
ture will sink current when RESET is asserted. Connect
a pull-up resistor from RESET to any supply voltage up
to 6V (Figure 6). Select a resistor value large enough to
register a logic low (see
Electrical Characteristics), and
small enough to register a logic high while supplying all
input current and leakage paths connected to the RESET
line. A 10k
pull-up is sufficient in most applications.
Manual-Reset Input
The MAX6316_/MAX6317H/MAX6319_H/MAX6320P/
MAX6322HP feature a manual-reset input. A logic low on
MR asserts a reset. After MR transitions low to high, reset
remains asserted for the duration of the reset timeout peri-
od (tRP). The MR input is connected to VCC through an
internal 52k
pull-up resistor and therefore can be left
unconnected when not in use. MR can be driven with
TTL-logic levels in 5V systems, with CMOS-logic levels in
3V systems, or with open-drain or open-collector output
devices. A normally-open momentary switch from MR to
ground can also be used; it requires no external
debouncing circuitry. MR is designed to reject fast,
negative-going transients (typically 100ns pulses). A
0.1F capacitor from MR to ground provides additional
noise immunity.
The MR input pin is equipped with internal ESD-protection
circuitry that may become forward biased. Should MR be
driven by voltages higher than VCC, excessive current
would be drawn, which would damage the part. For
example, assume that MR is driven by a +5V supply other
than VCC. If VCC drops lower than +4.7V, MR’s absolute
maximum rating is violated [-0.3V to (VCC + 0.3V)], and
undesirable current flows through the ESD structure from
MR to VCC. To avoid this, use the same supply for MR as
the supply monitored by VCC. This guarantees that the
voltage at MR will never exceed VCC.
Watchdog Input
The MAX6316_/MAX6317H/MAX6318_H/MAX6320P/
MAX6321HP feature a watchdog circuit that monitors
the P’s activity. If the P does not toggle the watchdog
input (WDI) within the watchdog timeout period (tWD),
reset asserts. The internal watchdog timer is cleared by
reset or by a transition at WDI (which can detect pulses
as short as 50ns). The watchdog timer remains cleared
while reset is asserted. Once reset is released, the
timer begins counting again (Figure 7).
The WDI input is designed for a three-stated output
device with a 10A maximum leakage current and the
capability of driving a maximum capacitive load of 200pF.
The three-state device must be able to source and sink at
least 200A when active. Disable the watchdog function
by leaving WDI unconnected or by three-stating the driver
connected to WDI. When the watchdog timer is left open
circuited, the timer is cleared internally at intervals equal
to 7/8 of the watchdog period.
MAX6320
MAX6321
MAX6322
VCC
GND
RESET
WDI**
MR*
RESET***
MAX6320/MAX6322
MAX6320/MAX6321
MAX6321/MAX6322
*
**
***
5V SYSTEM
+5.0V
+3.3V
10k
Figure 6. MAX6320P/MAX6321HP/MAX6322HP Open-Drain
RESET Output Allows Use with Multiple Supplies
tR
tS
RESET
RESET PULLED LOW
BY C OR
RESET GENERATOR
ACTIVE
PULL-UP
TURNS ON
VCC
0.7V
0.8 x VCC
tRP
OR
C RESET DELAY
Figure 5. Bidirectional RESET Timing Diagram
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6318LH | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:5-Pin uP Supervisory Circuits with Watchdog and Manual Reset |
| MAX6318LHUK25AW | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX6318LHUK25AW+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 |
| MAX6318LHUK25AW-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 |
| MAX6318LHUK25AX | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
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