HD74CDCV857 Datasheet, PDF (13/15 Pages) Hitachi Semiconductor – 2.5-V Phase-lock Loop Clock Driver

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
AV_CC
Device
under _OUT
test
OUT
AGND
GND
V_DDQ /2
AV_CC/2
Z = 60 Ω
Z = 60 Ω
–V_DDQ /2
C=
14 pF
–V_DDQ /2
C=
14 pF
–V_DDQ /2
R_T=
10 Ω
R_T=
10 Ω
Z = 50 Ω
Z = 50 Ω
Oscillo
scope
R_T=
50 Ω
R_T=
50 Ω
V _DDQ
AV_CC
Device
under _OUT
test
V_DDQ
AV_CC
Z = 60 Ω
OUT
AGND
GND
Z = 60 Ω
R_T=
120 Ω
C=
14 pF
C=
14 pF
Figure 9 Output load test circuit
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