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參數(shù)資料
| 型號(hào)： | TC51 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 1レA Voltage Detector with Output Delay |
| 中文描述： | 1レ電壓檢測(cè)器的輸出延遲 |
| 文件頁(yè)數(shù)： | 5/14頁(yè) |
| 文件大?。?/td> | 499K |
| 代理商： | TC51 |
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2002 Microchip Technology Inc.
DS21429B-page 5
TC51
4.0
APPLICATIONS INFORMATION
4.1
Processor RESET Supervisor
Figure 4-1 shows the TC51 used as a processor reset
supervisor. Because the TC51 is available in threshold
settings of 1.6V to 6.0V, the user can choose the reset
single threshold setting best suited to the system power
supply voltage at hand. Also, the 1
μ
A supply current is
significantly lower than its nearest competitor.
As shown in the timing diagram (Figure 3-1),V
OUT
is
low for voltages between 0.7V and V
DET
+. The TC51
activates its on-board delay timer once the power
supply voltage is within tolerance (i.e., greater than
V
DET
+). V
OUT
is released after delay time (T
DLY
).
Should the power supply voltage momentarily dip
(
“
brown-out
”
condition), the TC51 immediately drives
and holds the processor RESET input low. RESET is
released after the power supply voltage is again within
tolerance, and after the delay timer expires. RESET is
driven and held low when power fails (power-off or
“
blackout
”
), and is maintained down low to a supply
voltage of 0.7V.
FIGURE 4-1:
PROCESSOR RESET
SUPERVISOR
FIGURE 4-2:
TC51 OPERATION DURING POWER-UP, BROWN-OUT AND POWER DOWN
TC51
V
OUT
GND
V
DD
V
DD
Processor
RESET
R1
47K
0.7V
Power-Up
Steady
State
Operation
T
DLY
Time
T
DLY
Brown-Out
Power Down
Nominal
Power Supply
Voltage
Threshold
Voltage
(V
DET
-, V
DET
+)
V
OH
TC51 Output
V
OL
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