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CDC921 Fiches technique(PDF) 12 Page - Texas Instruments

No de pièce CDC921
Description  133-MHz CLOCK SYNTHESIZER/DRIVER FOR PC MOTHERBOARDS WITH 3-STATE OUTPUTS
PDF  17 Pages
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

CDC921 Fiches technique(HTML) 12 Page - Texas Instruments

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CDC921
133-MHz CLOCK SYNTHESIZER/DRIVER FOR PC MOTHERBOARDS
WITH 3-STATE OUTPUTS
SCAS623 –MAY 27, 1999
12
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
switching characteristics, VDD = 3.135 V to 3.465 V, TA = 0°C to 85°C (continued)
48MHz
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
TEST CONDITIONS
MIN
TYP
MAX
UNIT
ten1
Output enable time
SEL133/100
48MHz
f(48MHz) = 48 MHz
6
10
ns
tdis1
Output disable time
SEL133/100
48MHz
f(48MHz) = 48 MHz
8
10
ns
tc
48MHz clock period†
f(48MHz) = 48 MHz
20.5
20.83
21.1
ns
Cycle to cycle jitter
f(CPU) = 100 or 133 MHz
500
ps
Duty cycle
f(48MHz) = 48 MHz
45
55
%
tsk(p)
48MHz pulse skew
48MHz
48MHz
f(48MHz) = 48 MHz
3
ns
tw1
Pulse duration width, high
f(48MHz) = 48 MHz
7.8
ns
tw2
Pulse duration width, low
f(48MHz) = 48 MHz
7.8
ns
tr
Rise time
VO = 0.4 V to 2 V
1
2.1
2.8
ns
tf
Fall time
VO = 0.4 V to 2 V
1
1.9
2.8
ns
† The average over any 1-
µs period of time is greater than the minimum specified period.
REF
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
TEST CONDITIONS
MIN
TYP
MAX
UNIT
ten1
Output enable time
SEL133/100
REFx
f(REF) = 14.318 MHz
6
10
ns
tdis1
Output disable time
SEL133/100
REFx
f(REF) = 14.318 MHz
8
10
ns
tc
REF clock period†
f(REF) = 14.318 MHz
69.84
ns
Cycle to cycle jitter
f(CPU) = 100 or 133 MHz
700
ps
Duty cycle
f(REF) = 14.318 MHz
45
55
%
tsk(o)
REF bus skew
REFx
REFx
f(REF) = 14.318 MHz
150
250
ps
tsk(p)
REF pulse skew
REFn
REFn
f(REF) = 14.318 MHz
2
ns
tw1
Pulse duration width, high
f(REF) = 14.318 MHz
26.2
32.7
ns
tw2
Pulse duration width, low
f(REF) = 14.318 MHz
26.2
31.2
ns
tr
Rise time
VO = 0.4 V to 2 V
1
2
2.8
ns
tf
Fall time
VO = 0.4 V to 2 V
1
1.9
2.8
ns
† The average over any 1-
µs period of time is greater than the minimum specified period.



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