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IDT54FCT88915TT133JB Datasheet(PDF) 6 Page - Integrated Device Technology |
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IDT54FCT88915TT133JB Datasheet(HTML) 6 Page - Integrated Device Technology |
6 / 11 page IDT54/74FCT88915TT 55/70/100/133 LOW SKEW PLL-BASED CMOS CLOCK DRIVER MILITARY AND COMMERCIAL TEMPERATURE RANGES 9.7 6 NOTES: 7. These two specs ( tRISE/FALL and tPULSE WIDTH 2Q output) guarantee that the FCT88915TT meets 68040 P-Clock input specification. 8. The wiring diagrams and written explanations of Figure 4 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. 9. 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 100 Ω to VCC and 100Ω to ground. tPD measurements were made with the loop filter connection shown below: LF External Loop Filter 0.1 µFC1 Analog GND 3072 tbl 09 3072 drw 05 3072 drw 04 68040 P-Clock Input 88915TT 2Q Output Rp Zo (clock trace) Rp = 1.5 Zo FREQ_SEL Level Feedback Output Allowable SYNC Input Frequency Range (MHZ) Corresponding 2Q output Frequency Range Phase Relationship of the Q Outputs to Rising SYNC Edge HIGH Q/2 10 to (2Q fMAX Spec)/4 40 to (2Q fMAX Spec) 0 ° HIGH Any Q (Q0-Q4) 20 to (2Q fMAX Spec)/2 40 to (2Q fMAX Spec) 0 ° HIGH Q5 20 to (2Q fMAX Spec)/2 40 to (2Q fMAX Spec) 180 ° HIGH 2Q 40 to (2Q fMAX Spec) 40 to (2Q fMAX Spec) 0 ° LOW Q/2 5 to (2Q fMAX Spec)/8 20 to (2Q fMAX Spec)/2 0 ° LOW Any Q (Q0-Q4) 10 to (2Q fMAX Spec)/4 20 to (2Q fMAX Spec)/2 0 ° LOW Q5 10 to (2Q fMAX Spec)/4 20 to (2Q fMAX Spec)/2 180 ° LOW 2Q 20 to (2Q fMAX Spec)/2 20 to (2Q fMAX Spec)/2 0 ° |
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