CF5018 series

SEIKO NPC CORPORATION —1

2.5V 3rd Overtone Crystal Oscillator Module ICs

OVERVIEW

The CF5018 series are crystal oscillator ICs that operate from 2.5V. Devices are available that provide 3rd

overtone oscillation in the range 30MHz to 80MHz. They are optimized for 2.5V operation, resulting in stable

oscillator startup characteristics and output duty stability. They feature a large reduction in chip surface area

compared to existing devices, making possible the construction of small-sized crystal oscillator.

FEATURES

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2.25 to 2.75V operating supply voltage range

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30MHz to 80MHz oscillation frequency range

(varies with version)

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– 40 to 85

°C operating temperature range

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Inverter amplifier feedback resistor built-in

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Standby function

• High impedance in standby mode, oscillator stops

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Low standby current

• Power-saving pull-up resistor built-in

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I

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CMOS output duty level (1/2VDD)

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50

± 5% output duty (at 1/2VDD)

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30pF output load

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Molybdenum-gate CMOS process

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Chip form (CF5018AL

×)

SERIES CONFIGURATION

ORDERING INFORMATION

Version

Operating

supply voltage

range [V]

Recommended operating

1. The recommended operating frequency is a yardstick value derived from the crystal used for NPC characteristics authentication. However, the

oscillator frequency band is not guaranteed. Specifically, the characteristics can vary greatly due to crystal characteristics and mounting condi-

tions, so the oscillation characteristics of components must be carefully evaluated.

gm ratio

Built-in capacitance [pF]

Rf

[k

Ω]

CF5018ALA

2.25 to 2.75

30 to 36

0.25

8

15

4.7

CF5018ALB

36 to 40

0.50

3.5

CF5018ALC

40 to 50

0.75

3.5

CF5018ALD

50 to 60

1.00

3.0

CF5018ALE

60 to 80

1.50

10

3.5

Device

Package

CF5018AL

×–2

Chip form