MC74HC4060A(2000) 데이터 시트보기 (PDF) - ON Semiconductor

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MC74HC4060A
(Rev.:2000)

14−Stage Binary Ripple Counter With Oscillator

ON Semiconductor 

MC74HC4060A

TABLE 1. CRYSTAL OSCILLATOR AMPLIFIER SPECIFICATIONS (TA = 25°C; Input = Pin 11, Output = Pin 10)

Type

Positive Reactance (Pierce)

Input Resistance, Rin

60MΩ Minimum

Output Impedance, Zout (4.5V Supply)

200Ω (See Text)

Input Capacitance, Cin

5pF Typical

Output Capacitance, Cout

7pF Typical

Series Capacitance, Ca

5pF Typical

Open Loop Voltage Gain with Output at Full Swing, α

3Vdc Supply

4Vdc Supply

5Vdc Supply

6Vdc Supply

5.0 Expected Minimum

4.0 Expected Minimum

3.3 Expected Minimum

3.1 Expected Minimum

PIERCE CRYSTAL OSCILLATOR DESIGN

RS

LS CS

1

2

1

2

1 Re

Xe 2

CO

Value are supplied by crystal manufacturer (parallel resonant crystal).

Figure 8. Equivalent Crystal Networks

RS

jXLs

–jXCs

Zload

–jXCo

–jXC2 R

–jXC

Rload

Xload

NOTE: C = C1 + Cin and R = R1 + Rout. Co is considered as part of

the load. Ca and Rf typically have minimal effect below 2MHz.

Figure 9. Series Equivalent Crystal Load

Ca

Cin

Cout

Values are listed in Table 1.

Figure 10. Parasitic Capacitances of the Amplifier

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