SM8760CA

SEIKO NPC CORPORATION —1

Spread Spectrum Clock Generator

OVERVIEW

The SM8760CA is a compact clock generator IC with 4-times multiplication clock signal output that has a

spread spectrum (SS) function to reduce undesirable EMI radiation. The SM8760CA has built-in crystal oscil-

lator circuit, PLL, and loop filter. It accepts an input clock signal, generated using an external crystal or direct

external clock input, and outputs 1 SS-modulated 4-times multiplication clock signal and 1 unmodulated refer-

ence signal. In addition, the SM8760CA features control pins to select SS modulation function ON/OFF and

power-down modes.

FEATURES

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Spread spectrum clock output to reduce EMI

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Modulation rate: Center spread:

± 1.0%

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Input frequency

• Using crystal element connection: 12.75MHz

(fundamental frequency)

• Using external input clock: 12.75MHz

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Multiplication: 4-time multiplication

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Operating supply voltage: 3.3

± 0.3V

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Low jitter: 350ps typ (Cycle-to-Cycle)

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Functions: Power-down function, SS modulation

ON/OFF

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Mode control pins: Pull-up resistors built-in

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Package: 8-pin VSOP

APPLICATIONS

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Printer (laser/inkjet)

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Photocopiers, scanners

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LCD/PDP displays

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Projectors

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Miscellaneous electronic equipment

ORDERING INFORMATION

PINOUT

(Top view)

PACKAGE DIMENSIONS

(Unit: mm)

Device

Package

SM8760CAV

8-pin VSOP

XT

VDD

CLKOUT

VSS

REFOUT

XTN

PDN

ENS

1

4

8

5

0.575TYP

3.1 ± 0.3

0.10

0.22 ± 0.1

0.12

0.15 −

0.05

+ 0.1

0.65

M

0 to 10 °