?2003 Microchip Technology Inc.
DS21688C-page 3
TC670
2.0
TYPICAL PERFORMANCE CURVES
Note: Unless otherwise indicated, all limits are specified at +25?/SPAN>C, V
DD
= 3.0V to 5.5V, CLEAR = Low.
FIGURE 2-1:
Supply Current vs. Supply
Voltage.
FIGURE 2-2:
Fan Speed vs. Threshold
Voltage.
FIGURE 2-3:
Fan Speed vs. Threshold
Voltage.
FIGURE 2-4:
ALERT
 V
LOW
 vs. ALERT
 
I
SINK
.
FIGURE 2-5:
Fan Speed vs. ALERT
ACC
.
FIGURE 2-6:
ALERT
 Output Delay vs.
Power Supply Voltage.
Note:    The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
+90癈
+25癈
-45癈
115
70
75
80
85
90
95
100
105
110
Supply Voltage (V)
2.7
3.0    3.3    3.6
3.9    4.2    4.5
4.8    5.1    5.4    5.7
6.0
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
11000
12000
13000
14000
15000
0.00    0.25    0.50    0.75    1.00    1.25    1.50    1.75    2.00    2.25    2.50
THRESHOLD Volta e (V)
V
DD
 = 3.3V
V
DD
 = 3.0V
V
DD
 = 2.7V
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
11000
12000
13000
14000
15000
0.00    0.25    0.50    0.75    1.00    1.25    1.50    1.75    2.00    2.25    2.50
THRESHOLD Voltage (V)
V
DD
 = 3.6V
V
DD
 = 5.5V
V
DD
 = 5.0V
0
20
40
60
80
100
120
140
160
0.5
1
1.5
2
2.5
3
3.5
4
4.5
ALERT I
SINK
 (mA)
V
DD
 = 3.0V
V
DD
 = 5.5V
3000
4000
5000
6000
7000
8000
9000
10000
11000
12000
13000
-10.0 -8.0  -6.0  -4.0  -2.0   0.0   2.0   4.0   6.0   8.0  10.0
ALERT
ACC
 (%)
V
DD
 = 3.0V
T
A
 = -40贑
T
A
 = +25贑
T
A
 = +90贑
168
169
170
171
172
173
174
175
176
177
2.5
3.0
3.5
4.0
4.5
5.0
Power Supply Voltage (V
DD
)
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