HYUNDAI MicroElectronics
17. OSCILLATOR CIRCUIT
GMS82512/16/24
The GMS825xx has two oscillation circuits internally. XIN
and XOUT are input and output for frequency, respectively,
inverting amplifier which can be configured for being used
as an on-chip oscillator, as shown in Figure 17-1.
C1
X
OUT
Open
X
X
OUT
C2
8MHz
X
V
IN
External Clock
IN
SS
Recommend
External Oscillator
Crystal Oscillator
C1,C2 = 30pF±10pF
Crystal or Ceramic Oscillator
Figure 17-1 Oscillation Circuit
Oscillation circuit is designed to be used either with a ce-
ramic resonator or crystal oscillator. Since each crystal and
ceramic resonator have their own characteristics, the user
should consult the crystal manufacturer for appropriate
values of external components.
Oscillation circuit is designed to be used either with a ce-
ramic resonator or crystal oscillator. Since each crystal and
ceramic resonator have their own characteristics, the user
should consult the crystal manufacturer for appropriate
values of external components.
X
X
OUT
IN
In addition, see Figure 17-2 for the layout of the crystal.
Note: Minimize the wiring length. Do not allow the wiring to
intersect with other signal conductors. Do not allow the wir-
ing to come near changing high current. Set the potential of
the grounding position of the oscillator capacitor to that of
VSS. Do not ground it to any ground pattern where high cur-
rent is present. Do not fetch signals from the oscillator.
Figure 17-2 Layout of Oscillator PCB circuit
FEB. 2000 Ver 1.00
59
HYNIX [ HYNIX SEMICONDUCTOR ]
