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CDC9842DWR Arkusz danych(PDF) 5 Page - Texas Instruments

Numer części CDC9842DWR
Szczegółowy opis  PC MOTHERBOARD CLOCK SYNTHESIZER/DRIVER
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CDC9842DWR Arkusz danych(HTML) 5 Page - Texas Instruments

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CDC9842
PC MOTHERBOARD CLOCK SYNTHESIZER/DRIVER
WITH 3-STATE OUTPUTS
SCAS546B – NOVEMBER 1995 – REVISED MAY 1996
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
timing requirements over recommended ranges of supply voltage and operating free-air
temperature
MIN
MAX
UNIT
After SEL1, SEL0
5
Stabilization time†
After OE
5
ms
After power up
5
† Time required for the integrated PLL circuit to obtain phase lock of its feedback signal to its reference signal. In order for phase lock to be obtained,
a fixed-frequency, fixed-phase reference signal must be present at X1. Until phase lock is obtained, the specifications for propagation delay and
skew parameters given in the switching characteristics table are not applicable.
switching characteristics (see Figures 1 and 2)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 3.135 V
to 3.6 V,
TA = 0°C to 70°C
UNIT
()
()
MIN
MAX
t
HCLKn
200
ps
tskew‡
PCLKn
400
ps
Offset‡
HCLKn
PCLKn
1
4
ns
Jitter‡
HCKLn
±250
ps
Jitter‡
PCLKn
±350
ps
Duty cycle
Any output
45%
55%
SEL0 = L, SEL1 = L
20
ns
HCKLn
SEL0 = L, SEL1 = H
16.7
ns
t ‡
SEL0 = H, SEL1 = L
15
ns
tc‡
SEL0 = L, SEL1 = L
40
ns
PCLKn
SEL0 = L, SEL1 = H
33.3
ns
SEL0 = H, SEL1 = L
30
ns
t ‡§
HCLKn
2
ns
tr‡§
PCKLn
2
ns
t ‡§
HCKLn
2
ns
tf‡§
PCLKn
2
ns
‡ Specifications are applicable only after the PLL stabilization time has elapsed.
§ Rise and fall times are characterized using the load circuits shown in Figure 1.


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