WF5027 series

SEIKO NPC CORPORATION —12

AC Characteristics

For Fundamental Oscillator (5027

×1 to 5027×7, 5027×P to 5027×W)

For 3rd Overtone Oscillator (5027

×A to 5027×D)

Timing chart

Parameter

Symbol

Condition

Rating

Unit

min

typ

max

Output rise time

–

2.0

4.5

ns

–

3.0

5.0

ns

Output fall time

–

2.0

4.5

ns

–

3.0

5.0

ns

Output duty cycle

Duty

Measurement cct 1, Ta = 25

45

50

55

%

Output disable delay time

Measurement cct 2, Ta = 25

–

–

50

µs

Parameter

Symbol

Condition

Rating

Unit

min

typ

max

Output rise time

–

1.2

3.0

ns

–

1.6

4.0

ns

Output fall time

–

1.2

3.0

ns

–

1.6

4.0

ns

Output duty cycle

Duty

Measurement cct 1, Ta = 25

45

50

55

%

Output disable delay time

Measurement cct 2, Ta = 25

–

–

50

µs

Figure 1. Output switching waveform

When INHN goes HIGH to LOW, the Q output goes HIGH once and then becomes high impedance.

When INHN goes LOW to HIGH, the Q output goes from high impedance to normal output operation when the oscillation starts (oscillation is detected).

*) The high-impedance interval in the figure is shown as a LOW level due to the 1k

Ω pull-down resistor connected to the Q pin (see "Measurement circuit

2" in the "Measurement Circuits" section).

Figure 2. Output disable and oscillation start timing chart

Q

DUTY measurement

)

T

100 (%)

Q

INHN

0.1V

Hi-Z*

Normal

operation

Normal

operation

Output

stopped