74HC_HCT4538_15 Datasheet, PDF (16/24 Pages) NXP Semiconductors – Dual retriggerable precision monostable multivibrator

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
R_EXT ×
C_EXT
(t_W)
0.84
0.70
0.56
0.6
0.42
10³
10⁴
10⁵
10⁶
R_EXT (Ω)
V_CC = 4.5 V; T_amb = 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
V_CC = 4.5 V; R_EXT = 10 kΩ; T_amb = 25 °C.
Fig 13. Typical pulse width accuracy versus external capacitance
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1.12
+10 %
R_EXT
−10 %
R_EXT ×
C_EXT
(t_W)
0.84
0.70
0.56
10^−5
0.42
10^−4
C_EXT (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
C_EXT = 1 nF; T_amb = 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
R_EXT ×
C_EXT
(t_W)
0.91
0.77
0.63
0.49
5
6
V_CC (V)
© NXP B.V. 2009. All rights reserved.
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