CF5018 datasheet(5/8 Pages) NPC

5 / 8 page

CF5018 series

SEIKO NPC CORPORATION —5

Switching Characteristics

VDD = 2.25 to 2.75V, VSS = 0V, Ta = −40 to +85°C unless otherwise noted.

Current consumption and Output waveform with NPC’s standard crystal

FUNCTIONAL DESCRIPTION

Standby Function

When INHN goes LOW, the oscillator stops and the oscillator output on Q becomes high impedance.

Power-saving Pull-up Resistor

The INHN pull-up resistance changes in response to the input level (HIGH or LOW). When INHN goes LOW

(standby state), the pull-up resistance becomes large to reduce the current consumption during standby.

Parameter

Symbol

Condition

Rating

Unit

min

typ

max

Output rise time

Measurement cct 3, load cct 1, 0.1VDD to 0.9VDD , CL = 30pF

–

Output fall time

Measurement cct 3, load cct 1, 0.9VDD to 0.1VDD , CL = 30pF

–

Output duty cycle1

1. The duty cycle characteristic is checked the sample chips of each production lot.

Duty

Measurement cct 3, load cct 1, VDD = 2.5V, Ta = 25°C,

f = 80MHz , CL = 30pF

45–55

Output disable delay time2

2. Oscillator stop function is built-in. When INHN goes LOW, normal output stops. When INHN goes HIGH, normal output is not resumed until after the

oscillator start-up time has elapsed.

tPLZ

Measurement cct 6, load cct 1, VDD = 2.5V, Ta = 25°C,

CL = 15pF

–

100

Output enable delay time2

tPZL

–

100

INHN

Oscillator

HIGH (or open)

fO output frequency

Normal operation

LOW

High impedance

Stopped

f [MHz]

R [

Ω]

L [mH]

Ca [fF]

Cb [pF]

18.62

16.24

1.733

5.337

20.53

11.34

1.396

3.989

22.17

7.40

1.370

4.105

15.37

3.83

1.836

5.191

25.42

4.18

1.254

5.170

20.58

5.22

0.671

4.965

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