74HC4538DB,112 查看數據表（PDF） - NXP Semiconductors.
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74HC4538DB,112 Datasheet PDF : 24 Pages
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NXP Semiconductors
74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
1.6
normalized
K factor
(K)
1.2
1.0
0.8
1 nF
> 100 nF
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1.12
REXT ×
CEXT
(tW)
0.84
0.70
0.56
0.6
0.42
103
104
105
106
REXT (Ω)
VCC = 4.5 V; Tamb = 25 °C.
Fig 12. Typical pulse width accuracy versus external resistance
1.6
normalized
K factor
(K)
1.2
1.0
0.8
0.6
10−10
10−9
10−8
10−7
10−6
VCC = 4.5 V; REXT = 10 kΩ; Tamb = 25 °C.
Fig 13. Typical pulse width accuracy versus external capacitance
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1.12
+10 %
REXT
−10 %
REXT ×
CEXT
(tW)
0.84
0.70
0.56
10−5
0.42
10−4
CEXT (F)
1.7
normalized
K factor
(K)
1.3
1.1
0.9
2 kΩ
5.6 kΩ
10 kΩ
1 MΩ
1 kΩ
0.7
1
2
3
4
CEXT = 1 nF; Tamb = 25 °C.
Fig 14. Typical pulse width accuracy versus power supply
74HC_HCT4538_3
Product data sheet
Rev. 03 — 8 June 2009
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1.19
REXT ×
CEXT
(tW)
0.91
0.77
0.63
0.49
5
6
VCC (V)
© NXP B.V. 2009. All rights reserved.
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