SM8761 series

NIPPON PRECISION CIRCUITS INC.—7

FUNCTIONAL DESCRIPTION

Master Clock

The SM8761 series master clock can be generated by the crystal oscillator formed by connecting a crystal

between XT (pin 1) and XTN (pin 8) as shown in Figure 2. Alternatively, an external master clock can be input

directly on XT (pin 1) as shown in Figure 3. If an external clock is input on XT, it is recommended that the

exceed the absolute maximum rating, otherwise it may cause the SM8761 series to breakdown.

Figure 2. Crystal element connection

Figure 3. External clock input

Oscillator

Internal

Circuits

XT (Pin1)

XTN (Pin8)

C1

C2

C1, C2 = 5 to 33pF

Oscillator

Internal

Circuits

XT (Pin1)

XTN (Pin8)

Open

External Clock