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CD74ACT297 Datasheet(PDF) 8 Page - Texas Instruments |
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CD74ACT297 Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 18 page  CD74ACT297 DIGITAL PHASE-LOCKED LOOP SCHS297D – AUGUST 1998 – REVISED JUNE 2002 8 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Carry Pulse (internal signal) Borrow Pulse (internal signal) I/D CLK I/D OUT Figure 4. I/D OUT in Lock Condition φB φA2 ECPD OUT Figure 5. Edge-Controlled Phase-Comparator Waveforms φB φA1 XORPD OUT Figure 6. Exclusive-OR Phase-Detector Waveforms tTHL tPHL 1/F max I/D CLK tPHL I/D OUT tTLH 50% VCC tw 1.5 V 1.5 V 50% VCC 10% 90% 3 V 0 V VOL ≈VCC Figure 7. Clock (ID CLK) to Output (ID OUT) Propagation Delays, Clock Pulse Duration, and Maximum Clock-Pulse Frequency |
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