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參數(shù)資料
| 型號： | MAX803 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 復(fù)位半導(dǎo)體 |
| 英文描述： | Very Low Supply Current 3-Pin Microprocessor Reset Monitor(低電源電流，3引腳微處理器復(fù)位監(jiān)控器) |
| 中文描述： | 3引腳微處理器復(fù)位電路 |
| 文件頁數(shù)： | 7/10頁 |
| 文件大小： | 108K |
| 代理商： | MAX803 |
MAX803 Series, NCP803 Series
http://onsemi.com
7
APPLICATIONS INFORMATION
V
CC
Transient Rejection
The MAX803/NCP803 series provides accurate V
CC
monitoring
and
reset
timing
power-down, and brownout/sag conditions, and rejects
negative-going transients (glitches) on the power supply
line. Figure 13 shows the maximum transient duration vs.
maximum negative excursion (overdrive) for glitch
rejection. Any combination of duration and overdrive which
lies under the curve will not generate a reset signal.
Combinations above the curve are detected as a brownout or
power-down. Typically, transient that goes 100 mV below
the reset threshold and lasts 5.0 s or less will not cause a
reset pulse. Transient immunity can be improved by adding
a capacitor in close proximity to the V
CC
pin of the
MAX803.
during
power-up,
Figure 13. Maximum Transient Duration vs.
Overdrive for Glitch Rejection at 25
°
C
Duration
V
TH
Overdrive
V
CC
10
250
200
110
60
M
50
RESET COMPARATOR OVERDRIVE (mV)
0
410
150
100
V
TH
= 1.2 V
160
210
260
310
360
V
TH
= 4.63 V
RESET Signal Integrity During Power-Down
The MAX803/NCP803 RESET output is valid to V
CC
=
1.0 V. Below this voltage the output becomes an “open
circuit” and does not sink current. This means CMOS logic
inputs to the Microprocessor will be floating at an
undetermined voltage. Most digital systems are completely
shutdown well above this voltage. However, in situations
where RESET must be maintained valid to V
CC
= 0 V, since
the NCP803/MAX803 has Open-Drain and active-low
output, it typically uses a pullup resistor. With this device,
RESET will most likely not maintain an active condition,
but will drift to a non-active level due to the pullup resistor
and the reduced sinking capability of the open-drain device.
Therefore, this device is not recommended for applications
where the RESET pin is required to be valid down to
V
CC
= 0 V.
V
CC
MAX809
NCP803
V
CC
R1
100 k*
GND
Figure 14. RESET Signal Integrity
RESET
*Assume High-Z Reset Input to Microprocessor
MAX803
RESET Output Allows Use With Two Power
Supplies
In numerous applications the pullup resistor place on the
RESET output is connected to the supply voltage monitored
by the IC. Nevertheless, a different supply voltage can also
power this output and so level-shift from the monitored
supply to reset the microprocessor. However, if the
NCP803/MAX803's supply goes blew 1 V, the RESET
output ability to sink current will decrease and the result is
a high state on the pin even though the supply's IC is under
the threshold level. This occurs at a V
CC
level that depends
on the R
pullup
value and the voltage which is connected.
V
CC
V
CC2
Microprocessor
RESET
MAX803
NCP803
GND
GND
R
pullup
Figure 15. MAX803 RESET Output with Two Supplies
RESET
V
CC
V
CC1
ORDERING, MARKING AND THRESHOLD INFORMATION
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX803_07 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Very Low Supply Current 3-Pin Microprocessor Reset Monitor |
| MAX803_EXR+T | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:3-Pin Microprocessor Reset Circuits |
| MAX803_EXR-T | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:3-Pin Microprocessor Reset Circuits |
| MAX8033 | 制造商:PCTEL 功能描述:ANTENNA UNIT |
| MAX803-EXR-T | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:3-Pin Microprocessor Reset Circuits |
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