December 1990

12

Philips Semiconductors

Product specification

14-stage binary ripple counter with oscillator

74HC/HCT4060

Fig.11 External components connection for a crystal oscillator.

TYPICAL CRYSTAL OSCILLATOR

In Fig.11, R2 is the power limiting resistor.

For starting and maintaining oscillation a minimum

transconductance is necessary, so R2 should not

be too large. A practical value for R2 is 2.2 k

Ω.

AC WAVEFORMS

Fig.12 Waveforms showing the clock (RS) to

pulse width, the output transition times and

the maximum clock frequency.

Fig.13 Waveforms showing the master reset (MR)

propagation delays and the master reset to

clock (RS) removal time.

PACKAGE OUTLINES

See