SM8707E View Datasheet(PDF) - Nippon Precision Circuits

Part Name

Description

Manufacturer

SM8707E

Clock Generator with Dual PLLs

Nippon Precision Circuits  

SM8707 series

FUNCTIONAL DESCRIPTION

27MHz Master Clock

The SM8707 series 27MHz master clock circuit is configured, as shown in Figure 3 and 4, with the crystal

oscillator element connected between XTI (pin 7) and XTO (pin 8).

Alternatively, the 27MHz master clock can be supplied from an external master clock input on XTI, as shown

in Figure 5 and 6.

If an external input clock on XTI is used, it is recommended that the frequency be 27.0000MHz, with 50%

duty, and 3.3V voltage amplitude level.

Furthermore, when using an external clock input, the input signal voltage should not exceed the absolute max-

imum rating, otherwise damage may occur.

C1

XTI (Pin 7)

Oscillator

C2

XTO (Pin 8)

C1, C2 = 5 to 33pF

Internal

Circuits

MO

C1

XTI (Pin 7)

Oscillator

C2

XTO (Pin 8)

C1, C2 = 5 to 33pF

Internal

Circuits

Figure 3. Crystal oscillator connection

(excluding SM8707K)

Figure 4. Crystal oscillator connection

(SM8707K)

External Clock XTI (Pin 7)

Open

Oscillator

XTO (Pin 8)

Internal

Circuits

MO

Figure 5. External clock input

(excluding SM8707K)

External Clock XTI (Pin 7)

Open

Oscillator

XTO (Pin 8)

Internal

Circuits

Figure 6. External clock input

(SM8707K)

NIPPON PRECISION CIRCUITS INC.—14

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