Datasheet
SCLS161D − DECEMBER 1982 − REVISED SEPTEMBER 2003
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
CONNECTING AN RC-OSCILLATOR CIRCUIT TO THE ’HC4060 DEVICES
The ’HC4060 devices consist of an oscillator section and 14 ripple-carry binary counter stages. The oscillator
configuration allows design of either RC- or crystal-oscillator circuits.
When an RC-oscillator circuit is implemented, two resistors and a capacitor are required. The components are
attached to the terminals as shown:
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
R2
R1
C
To determine the values of capacitance and resistance necessary to obtain a specific oscillator frequency (f), use
this formula:
f +
1
2(R1)(C)
ǒ
0.405 R2
R1)R2
) 0.693
Ǔ
If R2 > > R1 (i.e., R2 = 10R1), the above formula simplifies to:
f +
0.455
RC