HD74LS122P Просмотр технического описания (PDF) - Renesas Electronics

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HD74LS122P

Retriggerable Monostable Multivibrator (with Clear)

Renesas Electronics 

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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