74LVC1GX04GW NXP Semiconductors, 74LVC1GX04GW Datasheet - Page 11

• Manufacturer Part Number: 74LVC1GX04GW
• Manufacturer: NXP Semiconductors

Specifications of 74LVC1GX04GW

• Mounting Style: Surface Mount
• Lead Free Status / RoHS Status: Compliant

Philips Semiconductors
APPLICATION INFORMATION
Crystal controlled oscillator circuits are widely used in
clock pulse generators because of their excellent
frequency stability and wide operating frequency range.
The use of the 74LVC1GX04 provides the additional
advantages of low power dissipation, stable operation over
a wide range of frequency and temperature and a very
small footprint. This application information describes
crystal characteristics, design and testing of crystal
oscillator circuits based on the 74LVC1GX04.
Crystal Characteristics
Figure 8 is the equivalent circuit of a quartz crystal.
The reactive and resistive component of the impedance of
the crystal alone and the crystal with a series and a parallel
capacitance is shown in Figure 9.
2003 Aug 13
handbook, full pagewidth
X-tal driver
(a) resonance.
(b) anti-resonance.
(c) load resonance.
(a)
(b)
(c)
C L
C 0
C 0
C 0
Fig.9 Reactance and resistance characteristics of a crystal.
C L
C 1
R 1
C 1
R 1
C 1
R 1
L 1
L 1
L 1
0
0
0
R 1
11
R L
Figure 9 also shows that with a specified load capacitance
(C
circuit with either a series (b) or parallel (c) capacitance.
C
determining the value of the external components of the
oscillator.
handbook, halfpage
f r
L
f r
L
is specified by crystal manufacturers and is used in
), the load resonance frequency (f
f L
f L
R p
Fig.8 Equivalent circuit of a crystal.
f a
f a
f a
resistance
resistance
resistance
reactance
reactance
reactance
C 0
MNB104
f
f
f
74LVC1GX04
MNB102
Product specification
L
C 1
R 1
L 1
) is the same for a