5076 series

SEIKO NPC CORPORATION —9

FUNCTIONAL DESCRIPTION

Oscillation Start-up Detector Function

The devices also feature an oscillation start-up detector circuit. This circuit functions to disable the outputs

until the oscillation starts. This prevents unstable oscillator output at oscillator start-up when power is applied.

TYPICAL PERFORMANCE (5076B1)

The following characteristics measured using the crystal below. Note that the characteristics will vary with the

crystal used.

I

Crystal used for measurement

I

Crystal parameters

Frequency Pulling Range

Pulling Sensitivity

Measurement circuit

Parameter

C0 [pF]

1.5

γ (= C0/C1)

300

L1

C0

R1

C1

0

50

−50

−100

−150

−200

−250

100

150

200

250

0.0

0.3

0.6

0.9

1.2

1.5

1.8

0

50

100

150

200

250

0.0

0.3

0.6

0.9

1.2

1.5

1.8

VDD

VSS

XT

Q

Crystal

XTN

VC

0.1

µF

(Including probe

capacitance)