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參數(shù)資料
| 型號(hào)： | MIC812UU |
| 廠商： | MICREL INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO4 |
| 封裝： | SOT-143, SO-4 |
| 文件頁(yè)數(shù)： | 5/6頁(yè) |
| 文件大小： | 99K |
| 代理商： | MIC812UU |
February 2005
5
MIC811/812
MIC811/812
Applications Information
Microprocessor Reset
The /RESET (or RESET) pin is asserted whenever V
falls
below the reset threshold voltage. The /RESET pin remains
asserted for a period of 140ms after V
has risen above the
reset threshold voltage. The reset function ensures the
microprocessor is properly reset and powers up in a known
condition after a power failure. /RESET will remain valid with
V
CC
as low as 1.4V.
V
CC
Transients
The MIC811/812 are relatively immune to negative-going
V
glitches below the reset threshold. Typically, a negative-
going transient 125mV below the reset threshold with a
duration of 50
μ
s (25
μ
s for MIC8_R/S/T) or less will not cause
a reset.
Interfacing to Bidirectional Reset Pins
The MIC811/812 can interface with
Ps with bidirectional
reset pins by connecting a 4.7k
resistor in series with the
MIC811/812 output and the
μ
P reset pin.
Micrel, Inc.
/RESET Valid at Low Voltage
A resistor can be added from the /RESET pin to ground to
ensure the /RESET output remains low with V
down to 0V.
A 100k
resistor connected from the /RESET to ground is
recommended. The size of the resistor should be large
enough not to load the output excessively and small enough
to pull-down any stray leakage currents.
Reset Valid to V
CC
= 0V
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