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參數(shù)資料
| 型號(hào)： | MAX6304EPA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | +5V, Low-Power uP Supervisory Circuits with Adjustable Reset/Watchdog |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大?。?/td> | 102K |
| 代理商： | MAX6304EPA |
Interfac ing to μPs with
Bidirec tional Reset Pins
Since
RESET
is open-drain, the MAX6301 interfaces
easily with μPs that have bidirectional reset pins, such
as the Motorola 68HC11 (Figure 7). Connecting
RESET
directly to the μP’s reset pin with a single pull-up allows
either device to assert reset.
Negative-Going V
CC
T ransients
In addition to issuing a reset to the μP during power-up,
power-down, and brownout conditions, these supervisors
are relatively immune to short-duration negative-going
transients (glitches). The graph Maximum Transient
Duration vs. Reset Threshold Overdrive in the Typical
Operating Characteristicsshows this relationship.
The area below the curves of the graph is the region in
which these devices typically do not generate a reset
pulse. This graph was generated using a negative-
going pulse applied to V
IN
, starting above the actual
reset threshold (V
RST
) and ending below it by the mag-
nitude indicated (reset-threshold overdrive). As the
magnitude of the transient increases (farther below the
reset threshold), the maximum allowable pulse width
decreases. Typically, a V
CC
transient that goes 100mV
below the reset threshold and lasts 50μs or less will not
cause a reset pulse to be issued.
Watc hdog Input Current
Extended Mode
In extended mode (WDS = V
CC
), the WDI input is inter-
nally driven through a buffer and series resistor from
the watchdog counter (Figure 8). When WDI is left
unconnected, the watchdog timer is serviced within the
watchdog timeout period by a very brief low-high-low
pulse from the counter chain. For minimum watchdog
input current (minimum overall power consumption),
leave WDI low for the majority of the watchdog timeout
period, pulsing it low-high-low (>30ns) once within the
period to reset the watchdog timer. If instead WDI is
externally driven high for the majority of the timeout
period, typically 70μA can flow into WDI.
Normal Mode
In normal mode (WDS = GND), the internal buffer that
drives WDI is disabled. In this mode, WDI is a standard
CMOS input and leakage current is typically 100pA,
regardless of whether WDI is high or low.
M
+5V, Low-Power μP S upervisory Circ uits
with Adjustable Reset/Watc hdog
_______________________________________________________________________________________
9
0.1μF
MAX6301
MAX6302
MAX6303
MAX6304
V
CC
RESET IN
R2
R1
V
CC
Figure 6. Adding a Manual Reset Function
MAX6301
V
CC
RESET
V
CC
V
CC
RESET
GND
μP
RESET TO
OTHER SYSTEM
COMPONENTS
0.1μF
4.7k
Figure 7. Interfacing to μPs with Bidirectional Reset I/O Pins
MAX6301
MAX6302
MAX6303
MAX6304
WATCHDOG
TIMER
TORESET
GENERATOR
TOMODE
CONTROL
WDI
WDS
Figure 8. Watchdog Input Structure
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6304EPA+ | 功能描述:監(jiān)控電路 5V uPower Supervisor RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX6304ESA | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX6304ESA+ | 功能描述:監(jiān)控電路 5V uPower Supervisor RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX6304ESA+T | 功能描述:監(jiān)控電路 5V uPower Supervisor RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX6304ESA-T | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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