74HC4538 データシートの表示（PDF） - ON Semiconductor
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74HC4538 Datasheet PDF : 16 Pages
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MC74HC4538A
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ OUTPUT PULSE WIDTH CHARACTERISTICS (CL = 50 pF)t
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Conditions
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Symbol
Parameter
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ τ
Output Pulse Width*
(Figures 6 and 8)
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ —
Pulse Width Match
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Between Circuits in the
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ same Package
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ —
Pulse Width Match
Variation (Part to Part)
Timing Components
Rx = 10 kΩ, Cx = 0.1 µF
—
—
Guaranteed Limits
–55 to 25_C
VCC
v 85_C
v 125_C
Volts Min Max Min Max Min Max Unit
5.0 0.63 0.77 0.6 0.8 0.59 0.81 ms
—
± 5.0
%
—
± 10
%
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ *For output pulse widths greater than 100 µs, typically τ = kRxCx, where the value of k may be found in Figure 3.
0.8
TA = 25°C
0.7
0.6
0.5
0.4
0.3
1
2
3
4
5
6
7
VCC, POWER SUPPLY VOLTAGE (VOLTS)
Figure 3. Typical Output Pulse Width Constant,
k, versus Supply Voltage
(For output pulse widths > 100 µs: τ = kRxCx)
10 s
1s
100 ms
VCC = 5 V, TA = 25°C
10 ms
1 ms
100 µs 1 MΩ
10 µs 100 kΩ
1 µs 10 kΩ
100 ns 1 kΩ
0.00001 0.0001 0.001 0.01 0.1
1
CAPACITANCE (µF)
10 100
Figure 4. Output Pulse Width versus Timing Capacitance
1.1
Rx = 100 kΩ
1 Cx = 1000 pF
TA = 25°C
0.9
0.8
Rx = 1 MΩ
0.7
Cx = 0.1 µF
0.6
0.5
1
2
3
4
5
6
7
VCC, POWER SUPPLY VOLTAGE (VOLTS)
Figure 5. Normalized Output Pulse Width versus Power Supply Voltage
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6
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