HD74LS123FPEL データシートの表示（PDF） - Renesas Electronics
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HD74LS123FPEL Datasheet PDF : 9 Pages
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HD74LS123
Switching Characteristics
(VCC = 5 V, Ta = 25°C)
Item
Symbol Inputs Outputs min. typ. max. Unit
Condition
tPLH
A
tPHL
Q
—
23
33
Q
—
32
45
Propagation delay
tPLH
B
time
tPHL
Q
Q
—
—
23
34
44
56
ns
Cext = 0, Rext = 5 kΩ,
CL = 15 pF, RL = 2 kΩ
tPLH
CLR
tPHL
Q
—
20
27
Q
—
28
45
Output pulse width
t(out)min
t(out)
A, B
Q
—
116 200
Cext = 1000 pF,
Q
4
4.5
5
µs Rext = 10 kΩ,
CL = 15 pF, RL = 2 kΩ
Typical Application Data for HD74LS123
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)
Rev.2.00, Feb.18.2005, page 4 of 8
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