IDT54FCT388915T100JB 查看數據表（PDF） - Integrated Device Technology

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IDT54FCT388915T100JB

3.3V LOW SKEW PLL-BASED CMOS CLOCK DRIVER WITH (3-STATE)

Integrated Device Technology 

IDT54/74FCT388915T 70/100/133/150

3.3V LOW SKEW PLL-BASED CMOS CLOCK DRIVER

MILITARY AND COMMERCIAL TEMPERATURE RANGES

NOTES:

7. The wiring diagrams and written explanations of Figure 3 demonstrate the input and output frequency relationships for various possible feedback

configurations. The allowable SYNC input range to stay in the phase-locked condition is also indicated. There are two allowable SYNC frequency ranges,

depending on whether FREQ_SEL is HIGH or LOW. Also it is possible to feed back the Q5 output, thus creating a 180° phase shift between the SYNC

input and the Q outputs. The table below summarizes the allowable SYNC frequency range for each possible configuration.

FREQ_SEL

Level

HIGH

HIGH

HIGH

HIGH

LOW

LOW

LOW

LOW

Feedback

Output

Q/2

Any Q (Q0-Q4)

Q5

2X_Q

Q/2

Any Q (Q0-Q4)

Q5

2X_Q

Allowable SYNC Input

Frequency Range (MHZ)

10 to (2x _Q fMAX Spec)/4

20 to (2x_Q fMAX Spec)/2

20 to (2x_Q fMAX Spec)/2

40 to (2x_Q fMAX Spec)

5 to (2x_Q fMAX Spec)/8

10 to (2x_Q fMAX Spec)/4

10 to (2x_Q fMAX Spec)/4

20 to (2x_Q fMAX Spec)/2

Corresponding 2Q Output

Frequency Range

40 to (2Q fMAX Spec)

40 to (2Q fMAX Spec)

40 to (2Q fMAX Spec)

40 to (2Q fMAX Spec)

20 to (2Q fMAX Spec)/2

20 to (2Q fMAX Spec)/2

20 to (2Q fMAX Spec)/2

20 to (2Q fMAX Spec)/2

Phase Relationship

of the Q Outputs

to Rising SYNC Edge

0°

0°

180°

0°

0°

0°

180°

0°

3052 tbl 09

8. The tPD spec describes how the phase offset between the SYNC input and the output connected to the FEEDBACK input, varies with process, temperature

and voltage. Measurements were made with a 10MHz SYNC input and Q/2 output as feedback. The phase measurements were made at 1.5V. The Q/

2 output was terminated at the FEEDBACK input with 100Ω to VCC and 100Ω to ground. tPD measurements were made with the loop filter connection

shown below:

External Loop

Filter

LF

0.1µF

C1

Analog GND 3052 drw 04

9.8

6

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