HD74LS122 데이터 시트보기 (PDF) - Renesas Electronics
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HD74LS122 Datasheet PDF : 8 Pages
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HD74LS122
Typical Application Data for HD74LS122
For pulse widths when Cext ≤ 1000 pF, See Figure 3.
The output pulse is primarily a function of the external capacitor and resistor. For Cext > 1000 pF, the output pulse
width (tw) is defined as: tw(out) = K • Rext • Cext; See Figure 4.
VCC
Rext
+
– Cext
to Cext to Rext/Cext
Rext (kΩ)
Cext (pF)
tw(out) (ns)
Figure 2
Timing Component Connections
100,000
10,000
Rext = 160kΩ
Figure 3
1,000
100
10
1
Rext = 80kΩ
40kΩ
20kΩ
10kΩ
5kΩ
10
100
1,000
External capacitance Cext (pF)
Typical Output Pulse Width (Cext ≤ 1000 pF)
0.5
0.4
0.3
0.2
0.1
VCC = 5V
Ta = 25°C
0
103 2 3 5 7104 2 3 5 7105 2 3 5 7106 2 3 5 7107
Timing capacitance Cext (pF)
Figure 4
Cext vs. K (Cext > 1000 pF)
Rev.2.00, Feb.18.2005, page 5 of 7
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