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參數(shù)資料
| 型號(hào)： | MIC810_U |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | 20000 SYSTEM GATE 3.3 VOLT LOGIC CELL AR - NOT RECOMMENDED for NEW DESIGN |
| 中文描述： | 微處理器復(fù)位電路 |
| 文件頁(yè)數(shù)： | 5/8頁(yè) |
| 文件大?。?/td> | 166K |
| 代理商： | MIC810_U |
5
Microprocessor Reset
The RESET pin is asserted whenever VCC falls below
the reset threshold voltage. The reset pin remains
asserted for a period of 240ms after VCC has risen
above the reset threshold voltage. The reset function
ensures the microprocessor is properly reset and powers
up into a known condition after a power failure. RESET
will remain valid with VCCas low as 1.4V.
VCCTransients
The MIC809/MIC810 are relatively immune to negative-
going VCCglitches 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 an unwanted reset.
Interfacing to Bidirectional Reset Pins
The MIC809/MIC810 can interface with
μ
Ps with
bidirectional reset pins by connecting a 4.7K
resistor in
series with the MIC809/MIC810 output and the
μ
P reset
pin.
RESET Valid to 0V
A resistor can be added from the RESET pin to ground
to ensure the RESET output remains low with VCC
down to 0V. A 100K
resistor connected from RESET
to ground is recommended. The size of the resistor
should be large enough to not load the RESET output
and small enough to pull-down any stray leakage
currents.
Circuit Description
Figure 2. Reset Timing Diagram
Figure 3. RESET Valid to VCC= OV
VCC
Vthr
RESET
t1
t1
Vthr
VCC
RESET
μP
RESET
VCC
MIC809
VCC
100K
MIC809/MIC810 Microprocessor Reset Circuits
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