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CD54HC221 Datasheet, PDF (9/18 Pages) Texas Instruments – High-Speed CMOS Logic Dual Monostable Multivibrator with Reset
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CD54HC221, CD74HC221, CD74HCT221
Typical Performance Curves
685
RX = 10K
VCC = 5V
680
675
CX = 1µF
RX = 10K
TA = 25oC
0.9
0.8
HCT
670
0.7
665
-75 -50 -25 0 25 50 75 100 125 150 175
TA, AMBIENT TEMPERATURE (oC)
FIGURE 5. HC/HCT221 OUTPUT PULSE WIDTH vs
TEMPERATURE
0.6
0
2
4
6
8
10
VCC, SUPPLY VOLTAGE (V)
FIGURE 6. HC/HCT221 K FACTOR vs SUPPLY VOLTAGE
106
VCC = 2V
105
104
103
102
RX = 100K
RX = 50K
10
RX = 10K
1
RX = 2K
0.1
10
102
103
104
105
106
107
108
CX, TIMING CAPACITANCE (pF)
FIGURE 7. HC221 OUTPUT PULSE WIDTH vs CX
106
VCC = 4.5V
105
104
103
102 RX = 100K
RX = 50K
10
RX = 10K
RX = 2K
1
0.1
10
102
103
104
105
106
107
108
CX, TIMING CAPACITANCE (pF)
FIGURE 8. HC/HCT221 OUTPUT PULSE WIDTH vs CX
9
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