SM8701 datasheet(13/14 Pages) NPC

13 / 14 page

SM8701BM

NIPPON PRECISION CIRCUITS—13

TYPICAL APPLICATION

Connect the decoupling capacitors (approximately

0.1

µF and 1000pF) in parallel, as close to power

supply pins as possible.

In order to minimize noise, it is useful to make

ground as solid pattern.

Master clock stability affects the other outputs sta-

bility. In the usage of crystal oscillator, load

capacitor and crystal oscillator should be placed as

close to the SM8701BM as possible, and wired

shortly. Select crystal oscillators and load capaci-

tance carefully, depending on the condition, as

those combination will have inﬂuence on the fre-

quency accuracy(C1, C2).

Supply pattern including decoupling capacitors

needs careful attention to make the IC’s perfor-

mance better, since the SM8701BM outputs sev-

eral high frequency clocks. Pattern capacitance

from output pins should not to be large for preven-

tion of the noise. Connecting output pins to buff-

ers is useful if it is necessary.

Power supply and ground pins.

• VDD

:5V

Power supply for digital block

(CPU I/F*, XT1, XT2).

• GND

Ground for digital block

(CPU I/F*, XT1, XT2, output

block except SO3).

• VDDP :5V

Power supply for PLL block.

• GNDP :

Ground for PLL block.

• VDDO :3.3V Power supply for SO3.

• GNDO :

Ground for SO3.

• VDD3 :3.3V Power supply for output block

(except SO3).

*: CPU I/F: MDT/R0, MCK/R1, MLEN/R2, RSTN,

P/S

VDDO

P/S

MLEN/R2

VDD

SO4

SO1

XTO

MDT/R0

SO3

VDD3

MON

GND

XTI

MCK/R1

GNDP

VDDP

GNDO

SO2

RSTN

SM8701BM

CPU

+5V

256fs

384fs

768fs

33.8688MHz

27MHz

27MHz(Inverted)

X'tal

+3.3V

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