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HD74LS122 датащи(PDF) 5 Page - Renesas Technology Corp

номер детали HD74LS122
подробное описание детали  Retriggerable Monostable Multivibrator (with Clear)
PDF  8 Pages
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производитель  RENESAS [Renesas Technology Corp]
домашняя страница  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD74LS122 датащи(HTML) 5 Page - Renesas Technology Corp

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HD74LS122
Rev.2.00, Feb.18.2005, page 5 of 7
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
• R
ext
• C
ext; See Figure 4.
VCC
Rext (k
Ω)
Cext (pF)
tw(out) (ns)
Rext
to Rext/Cext
to Cext
Cext
+
–
Figure 2
Timing Component Connections
10
1
10
100
1,000
100
1,000
10,000
100,000
External capacitance Cext (pF)
Rext = 80k
Ω
40k
Ω
20k
Ω
10k
Ω
5k
Ω
Rext = 160k
Ω
Figure 3
Typical Output Pulse Width (Cext
≤ 1000 pF)
0.5
0
0.4
0.2
0.1
Timing capacitance Cext (pF)
0.3
103 2 3
5 7104 2 3
5 7105 2 3
5 7106 2 3
5 7107
VCC = 5V
Ta = 25°C
Figure 4
Cext vs. K (Cext > 1000 pF)



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