197
9152BINDCO02/10
ATA8743
29.3 Clock Characterizations
29.3.1
Calibrated Internal RC Oscillator Accuracy
Note:
1. The overall jitter increase proportionally to the divider ratio
Example: with Oscillator divided by 32, jitter standard deviation will be 32 x 0.4 ns = 12.8 ns.
29.3.2
External Clock Drive Waveforms
Figure 29-2. External Clock Drive Waveforms
29.3.3
External Clock Drive
Table 29-2. Calibration Accuracy of Internal RC Oscillator
Frequency
V
CC
Temperature
Accuracy
Factory
Calibration
8.0 MHz
3V
25癈
?%
User Calibration
7.3 - 8.1 MHz
2.7V - 5.5V
-40癈 - 125癈
?0%
Oscillator Jitter
8.0 MHz
2.7V - 5.5V
-40癈 - 125?/DIV>
Standard Deviation 0.4 ns
(1)
V
IL1
V
IH1
Table 29-3. External Clock Drive
Symbol
Parameter
V
CC
= 2.7 - 5.5V
V
CC
= 4.5 - 5.5V
Units
Min.
Max.
Min.
Max.
1/t
CLCL
Clock Frequency
0
10
0
20
MHz
t
CLCL
Clock Period
100
50
ns
t
CHCX
High Time
40
20
ns
t
CLCX
Low Time
40
20
ns
t
CLCH
Rise Time
1.6
0.5
祍
t
CHCL
Fall Time
1.6
0.5
祍
?SPAN class="pst ATA8743-PXQW_2172479_4">t
CLCL
Change in period from one clock cycle to the next
2
2
%
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