HD74CDCV857 데이터 시트보기 (PDF) - Hitachi -> Renesas Electronics

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HD74CDCV857

2.5-V Phase-lock Loop Clock Driver

Hitachi -> Renesas Electronics 

HD74CDCV857

Yx, FBOUT

Yx, FBOUT

t half cycle n

t half cycle n+1

t HCC = t half cycle n - t half cycle n+1

Figure 8 Half cycle to cycle jitter

V DDQ

AVCC

Device

under OUT

test

OUT

AGND

GND

VDDQ /2

AVCC/2

Z = 60 Ω

Z = 60 Ω

-VDDQ /2

C=

14 pF

-VDDQ /2

C=

14 pF

-VDDQ /2

RT=

10 Ω

RT=

10 Ω

Z = 50 Ω

Z = 50 Ω

Oscillo

scope

RT=

50 Ω

RT=

50 Ω

V DDQ

AVCC

Device

under OUT

test

VDDQ

AVCC

Z = 60 Ω

OUT

AGND

GND

Z = 60 Ω

RT=

120 Ω

C=

14 pF

C=

14 pF

Figure 9 Output load test circuit

11

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