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參數(shù)資料
| 型號： | TS88915T |
| 英文描述： | TS88915T [Updated 6/02. 19 Pages] Low Skew CMOS PLL Clock Driver. 3 state 70 and 100 MHZ versions |
| 中文描述： | TS88915T [更新6月2日。 19頁]低偏移的CMOS PLL時鐘驅(qū)動器。 3國70和100兆赫的版本 |
| 文件頁數(shù)： | 9/19頁 |
| 文件大小： | 333K |
| 代理商： | TS88915T |
9
TS88915T
2122A–HIREL–06/02
Application
Information
General AC Specification
Notes
1.
Several specifications can only be measured when the TS88915T is in phase-
locked operation. TS88915T units are fabricated with key transistor properties
intentionally varied to create a 14 cell designed experimental matrix.
These two specs (t
RISE/FALL
and t
PULSE WIDTH
2X_Q output) guarantee that the
TS88915T meets the 33 MHz TS68040 P-Clock input specification (at 66 MHz).
For these two specs to be guaranteed by Atmel, the termination scheme shown
below in Figure 5 must be used.
2.
Figure 5.
TS68040 P-Clock Input Termination Scheme
3.
To meet the 25 MHz TS68040 P-clock input specification (2 x Q tpulse width at
50 MHz) FREQ-SEL must be low. This configuration improve the accuracy of the
88915T duty cycle.
The wiring diagrams and explanations in Figure 8, Figure 9 and Figure 10 dem-
onstrate the input and output frequency relationships for three possible feedback
configurations. The allowable SYNC input range for each case is also indicated.
There are two allowable SYNC frequency ranges, depending whether
FREQ_SEL is high or low. Although not shown, it is possible to feed back the Q5
output, thus creating a 180
°
phase shift between the SYNC input and the “Q”
outputs. Table 3 below summarizes the allowable SYNC frequency range for
each possible configuration.
4.
TS88915
2X_Q
Output
TS68040
P_Clock
Input
Rs
Z0 (CLOCK TRACE)
Rp
Rp = 1.5Z0
Rs = Z0-7
Table 3.
Allowable SYNC Input Frequency Range for Different Feedback Configurations
FREQ_SEL
Level
FEEDBACK
Output
Allowable SYNC Input
Frequency Range (MHz)
Corresponding VCO
Frequency Range
Phase Relationships of the
“Q” Outputs to Rising
SYNC Edge
HIGH
HIGH
HIGH
HIGH
Q/2
any “Q” (Q0-Q4)
Q5
2X_Q
5 to (2X_Q FMAX Spec)/4
10 to (2X_Q FMAX Spec)/2
10 to (2X_Q FMAX Spec)/2
20 to (2X_Q FMAX Spec)
20 to (2X_Q FMAX Spec)
20 to (2X_Q FMAX Spec)
20 to (2X_Q FMAX Spec)
20 to (2X_Q FMAX Spec)
0
°
0
°
180
°
0
°
LOW
LOW
LOW
LOW
Q/2
any “Q” (Q0-Q4)
Q5
2X_Q
2.5 to (2X_Q FMAX Spec)/8
5 to (2X_Q FMAX Spec)/4
5 to (2X_Q FMAX Spec)/4
10 to (2X_Q FMAX Spec)/2
20 to (2X_Q FMAX Spec)
20 to (2X_Q FMAX Spec)
20 to (2X_Q FMAX Spec)
20 to (2X_Q FMAX Spec)
0
°
0
°
180
°
0
°
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