GMS81C2012 datasheet(49/92 Pages) HYNIX

49 / 92 page

Hyundai Micro Electronics

GMS81C2020/GMS81C2120

Nov. 1999 Ver 0.0

preliminary

cillator, as shown in Figure 13-2 .

Figure 13-3 Sub Oscillator Connections

To drive the device from an external clock source, XO

should be left unconnected while XI is driven as shown in

Figure 13-4 . There are no requirements on the duty cycle

of the external clock signal, since the input to the internal

clocking circuitry is through a divide-by-two flip-flop, but

minimum and maximum high and low times specified on

the data sheet must be observed.

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 ex-

ternal RC oscillator. Since External RC oscillator has their

own characteristic, the user should figure out the appropri-

ate value of external resister. (Please refer the DC Spec)

Figure 13-4 External R Connection

Note:

When using a system clock oscillator, carry out wir-

ing in the broken line area in Figure 13-2 to prevent

any effects from wiring capacities.

- Minimize the wiring length.

- Do not allow wiring to intersect with other signal

conductors.

- Do not allow wiring to come near changing high

current.

- Set the potential of the grounding position of the

oscillator capacitor to that of VSS. Do not ground to

any ground pattern where high current is present.

- Do not fetch signals from the oscillator.

SXO

SXI

Vss

Recommended: C1, C2 = 20pF±4pF for Crystals

Vss

OPEN

External

Clock

Source

Vss

REXT

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