Nexperia
74HC6323A; 74HCT6323A
Programmable ripple counter with oscillator; 3-state
aaa-028606
R
bias
100 kΩ to 1 MΩ
R2
2.2 kΩ
100 pF
C2C1
22 pF to 37 pF
6
X2
X1
7
MR (from logic)
Above 5 MHz replace R2 by a capacitor of half the value of
C2.
C
L
at which a crystal is specified (or adjusted) equals for this
application C1 x C2/(C1 + C2)
Figure 9. Typical setup for a crystal oscillator operating
in the fundamental mode (1 MHz to 25 MHz)
aaa-028607
R
bias
3 kΩ
6
X2
X1
7
MR (from logic)
C1
1 pF to 10 pF
(optional)
Applicable for third overtone crystals (lower damping
resistance at the third harmonic frequency) at typical
50 MHz. For lower frequencies extra load capacitors must
be supplied, or increase bias resistor.
Figure 10. Typical set-up for a crystal oscillator
operating in the third overtone mode without the use of
an inductor
Table 10. Typical application values
Fundamental mode Third overtone mode
f (MHz) R2 (kΩ) C1 (pF) C2 (pF) f (MHz) R
bias
(kΩ) C1 (pF)
1 4.7 47 to 68
10 2.2 47 to 68
25 1 33 33
50 3.0 4.7
74HC_HCT6323A All information provided in this document is subject to legal disclaimers. © Nexperia B.V. 2018. All rights reserved.
Product data sheet Rev. 4 — 9 July 2018
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