Datasheet

9
Typical Performance Curves
FIGURE 8. K FACTOR vs DC SUPPLY VOLTAGE (V
CC
) - V FIGURE 9. K FACTOR vs DC SUPPLY VOLTAGE (V
CC
) - V
FIGURE 10. K FACTOR vs C
X
FIGURE 11. MINIMUM RETRIGGER TIME vs TIMING
CAPACITANCE
0.70
0.69
0.68
0.67
2 3 4 4.5 5 5.5 6
V
CC
, DC SUPPLY VOLTAGE (V)
K FACTOR
10kΩ, 10nF
10kΩ, 100nF
100kΩ, 100nF
100kΩ, 10nF
HC4538 - TA11646C
T
A
= 25
o
C
0.70
0.69
0.68
0.67
2 3 4 4.5 5 5.5 6
V
CC
, DC SUPPLY VOLTAGE (V)
K FACTOR
10kΩ, 10nF
10kΩ, 100nF
100kΩ, 100nF
100kΩ, 10nF
HCT4538 - TA13646C
T
A
= 25
o
C
1.3
1.1
0.9
0.6
10
10
2
10
3
10
4
10
5
C
X
, TIMING CAPACITANCE (pF)
K FACTOR
2kΩ
10kΩ
100kΩ
HC/HCT4538
V
CC
= 5V, T
A
= 25
o
C
1.2
1.0
0.8
0.7
10
4
10
2
10
10
2
10
3
10
4
C
X
, TIMING CAPACITANCE (pF)
t
rr
, TYP MIN RETRIGGER TIME (ns)
V
CC
= 4.5V
T
A
= 25
o
C
R
X
= 10kΩ
10
3
V
CC
= 5V
CD54HC4538, CD74HC4538, CD54HCT4538, CD74HCT4538