CF5016 series

SEIKO NPC CORPORATION —5

Switching Characteristics

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,

–

2.5

5.0

ns

–

4.0

8.0

Output fall time

Measurement cct 3, load cct 1,

–

2.5

5.0

ns

–

4.0

8.0

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

Duty1

Measurement cct 3, load cct 1,

f = 45MHz

45–55

%

Duty2

f = 50MHz

40–60

%

Duty3

f = 30MHz

45–55

%

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.

–

–

200

ns

–

–

200

ns

INHN

Q

Oscillator

HIGH (or open)

Normal operation

LOW

High impedance

Stopped

f [MHz]

R [

Ω]

L [mH]

Ca [fF]

Cb [pF]

30

5.26

2.82

9.99

2.68

40

8.24

5.72

2.77

2.22

50

16.12

6.88

1.43

1.18

L

Ca

R

Cb