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參數(shù)資料
| 型號： | MAX803_07 |
| 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 |
| 文件頁數(shù)： | 6/9頁 |
| 文件大?。?/td> | 94K |
| 代理商： | MAX803_07 |
MAX803 Series, NCP803 Series
http://onsemi.com
6
APPLICATIONS INFORMATION
V
CC
Transient Rejection
The MAX803/NCP803 series provides accurate V
CC
monitoring
and
reset
timing
powerdown, and brownout/sag conditions, and rejects
negativegoing transients (glitches) on the power supply
line. Figure 11 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
powerdown. 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
powerup,
Figure 11. Maximum Transient Duration vs.
Overdrive for Glitch Rejection at 25
°
C
Duration
V
TH
Overdrive
V
CC
10
250
200
110
60
RESET COMPARATOR OVERDRIVE (mV)
M
50
0
410
150
100
V
TH
= 1.2 V
160
210
260
310
360
V
TH
= 4.63 V
RESET Signal Integrity During PowerDown
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 OpenDrain and activelow
output, it typically uses a pullup resistor. With this device,
RESET will most likely not maintain an active condition,
but will drift to a nonactive level due to the pullup resistor
and the reduced sinking capability of the opendrain 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
RESET
V
CC
R1
100 k*
GND
Figure 12. RESET Signal Integrity
*Assume HighZ 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 levelshift 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 13. MAX803 RESET Output with Two Supplies
RESET
V
CC
V
CC1
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