MC74HC4538 查看數據表（PDF） - ON Semiconductor

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MC74HC4538

Dual Precision Monostable Multivibrator (Retriggerable, Resettable)

ON Semiconductor 

MC74HC4538A

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ OUTPUT PULSE WIDTH CHARACTERISTICS (CL = 50 pF)t

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Conditions

Guaranteed Limits

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Symbol

Parameter

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ τ

Output Pulse Width*

(Figures 6 and 8)

Timing Components

–55 to 25_C

VCC

v 85_C

v 125_C

V

Min Max Min Max Min Max Unit

Rx = 10 kW, Cx = 0.1 mF 5.0 0.63 0.77 0.6 0.8 0.59 0.81 ms

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ −

Pulse Width Match Between

−

−

± 5.0

%

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Circuits in the same Package

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ −

Pulse Width Match Variation

−

−

± 10

%

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ (Part to Part)

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ *For output pulse widths greater than 100 ms, 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 ms: τ = kRxCx)

10 s

1s

100 ms

VCC = 5 V, TA = 25°C

10 ms

1 ms

100 ms 1 MW

10 ms 100 kW

1 ms 10 kW

100 ns 1 kW

0.00001 0.0001 0.001 0.01 0.1

1

CAPACITANCE (mF)

10 100

Figure 4. Output Pulse Width versus Timing Capacitance

1.1

Rx = 100 kW

1 Cx = 1000 pF

TA = 25°C

0.9

0.8

Rx = 1 MW

0.7

Cx = 0.1 mF

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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